This document is primarily concerned with the MPC755; however, unless otherwise noted, all information here also applies to the MPC745. The MPC755 and MPC745 are reduced instruction set computing (RISC) microprocessors that implement the PowerPC instruction set architecture. This document describes pertinent physical characteristics of the MPC755. For functional characteristics of the processor, refer to the MPC750 RISC Microprocessor Family User’s Manual. This document contains the following topics: Topic Page Section 1.1, “Overview” 1 Section 1.2, “Features” 3 Section 1.3, “General Parameters” 5 Section 1.4, “Electrical and Thermal Characteristics” 6 Section 1.5, “Pin Assignments” 23 Section 1.6, “Pinout Listings” 25 Section 1.7, “Package Description” 30 Section 1.8, “System Design Information” 34 Section 1.9, “Document Revision History” 47 Section 1.10, “Ordering Information” 49 To locate any published errata or updates for this document, refer to the website at http://www.motorola.com/semiconductors. 1.1 Overview The MPC755 is targeted for low-cost, low-power systems and supports the following power management features—doze, nap, sleep, and dynamic power management. The MPC755 consists of a processor core and an internal L2 tag combined with a dedicated L2 cache interface and a 60x bus. The MPC745 is identical to the MPC755 except it does not support the L2 cache interface. Figure 1 shows a block diagram of the MPC755. Advance Information MPC755EC/D Rev. 6, 9/2002 MPC755 RISC Microprocessor Hardware Specifications Freescale S emiconduct or, I Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com nc...
Transcript
This document is primarily concerned with the MPC755; however, unless otherwise noted, allinformation here also applies to the MPC745. The MPC755 and MPC745 are reducedinstruction set computing (RISC) microprocessors that implement the PowerPC instructionset architecture. This document describes pertinent physical characteristics of the MPC755.For functional characteristics of the processor, refer to theMPC750 RISC MicroprocessorFamily User’s Manual.
This document contains the following topics:
Topic Page
Section 1.1, “Overview” 1
Section 1.2, “Features” 3
Section 1.3, “General Parameters” 5
Section 1.4, “Electrical and Thermal Characteristics” 6
Section 1.5, “Pin Assignments” 23
Section 1.6, “Pinout Listings” 25
Section 1.7, “Package Description” 30
Section 1.8, “System Design Information” 34
Section 1.9, “Document Revision History” 47
Section 1.10, “Ordering Information” 49
To locate any published errata or updates for this document, refer to the website athttp://www.motorola.com/semiconductors.
1.1 OverviewThe MPC755 is targeted for low-cost, low-power systems and supports the following powermanagement features—doze, nap, sleep, and dynamic power management. The MPC755consists of a processor core and an internal L2 tag combined with a dedicated L2 cacheinterface and a 60x bus. The MPC745 is identical to the MPC755 except it does not supportthe L2 cache interface.
Figure 1 shows a block diagram of the MPC755.
Advance Information
MPC755EC/DRev. 6, 9/2002
MPC755RISC MicroprocessorHardware Specifications
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ISC
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ardware
Specifications
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Overview
Figure
1.MP
C755
Block
Diagram
Additional Features• Time Base Counter/Decrementer• Clock Multiplier• JTAG/COP Interface• Thermal/Power Management• Performance Monitor
+
+
Fetcher Branch Processing
BTIC64-Entry
+ × ÷FPSCRCR FPSCR
L2CR
CTRLR
BHT
Data MMU
Instruction MMU
Not in the MPC745
EAPA
+ × ÷
Instruction Unit
Unit
Instruction Queue(6-Word)
2 Instructions
Reservation Station Reservation Station Reservation Station
— Full hardware detection of dependencies (resolved in the execution units)
— Dispatch two instructions to six independent units (system, branch, load/store, fixed-pointunit 1, fixed-point unit 2, floating-point)
— Serialization control (predispatch, postdispatch, execution serialization)
• Decode
— Register file access
— Forwarding control
— Partial instruction decode
• Completion
— Six-entry completion buffer
— Instruction tracking and peak completion of two instructions per cycle
— Completion of instructions in program order while supporting out-of-order instructionexecution, completion serialization, and all instruction flow changes
• Fixed point units (FXUs) that share 32 GPRs for integer operands
— Fixed Point Unit 1 (FXU1)—multiply, divide, shift, rotate, arithmetic, logical
— Fixed Point Unit 2 (FXU2)—shift, rotate, arithmetic, logical
Packages MPC745: Surface mount 255 plastic ball grid array (PBGA)MPC755: Surface mount 360 ceramic ball grid array (CBGA)Surface mount 360 plastic ball grid array (PBGA)
Core power supply 2.0 V ± 100 mV DC (nominal; some parts support core voltages down to1.8 V; see Table 3 for recommended operating conditions)
I/O power supply 2.5 V ± 100 mV DC or3.3 V ± 165 mV DC (input thresholds are configuration pin selectable)
1.4 Electrical and Thermal CharacteristicsThis section provides the AC and DC electrical specifications and thermal characteristics for the MPC755.
1.4.1 DC Electrical CharacteristicsTable 1 through Table 7 describe the MPC755 DC electrical characteristics. Table 1 provides the absolutemaximum ratings.
Table 1. Absolute Maximum Ratings 1
Characteristic Symbol Maximum Value Unit Notes
Core supply voltage VDD –0.3 to 2.5 V 4
PLL supply voltage AVDD –0.3 to 2.5 V 4
L2 DLL supply voltage L2AVDD –0.3 to 2.5 V 4
Processor bus supply voltage OVDD –0.3 to 3.6 V 3
L2 bus supply voltage L2OVDD –0.3 to 3.6 V 3
Input voltage Processor bus Vin –0.3 to OVDD + 0.3 V V 2, 5
L2 bus Vin –0.3 to L2OVDD + 0.3 V V 2, 5
JTAG signals Vin –0.3 to 3.6 V
Storage temperature range Tstg –55 to 150 °C
Notes:1. Functional and tested operating conditions are given in Table 3. Absolute maximum ratings are stress ratings only,
and functional operation at the maximums is not guaranteed. Stresses beyond those listed may affect devicereliability or cause permanent damage to the device.
2. Caution: Vin must not exceed OVDD or L2OVDD by more than 0.3 V at any time including during power-on reset.3. Caution: L2OVDD/OVDD must not exceed VDD/AVDD/L2AVDD by more than 1.6 V during normal operation. During
power-on reset and power-down sequences, L2OVDD/OVDD may exceed VDD/AVDD/L2AVDD by up to 3.3 V for upto 20 ms, or by 2.5 V for up to 40 ms. Excursions beyond 3.3 V or 40 ms are not supported.
4. Caution: VDD/AVDD/L2AVDD must not exceed L2OVDD/OVDD by more than 0.4 V during normal operation. Duringpower-on reset and power-down sequences, VDD/AVDD/L2AVDD may exceed L2OVDD/OVDD by up to 1.0 V for upto 20 ms, or by 0.7 V for up to 40 ms. Excursions beyond 1.0 V or 40 ms are not supported.
5. This is a DC specifications only. Vin may overshoot/undershoot to a voltage and for a maximum duration as shownin Figure 2.
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Figure 2 shows the allowable undershoot and overshoot voltage on the MPC755.
Figure 2. Overshoot/Undershoot Voltage
The MPC755 provides several I/O voltages to support both compatibility with existing systems andmigration to future systems. The MPC755 core voltage must always be provided at nominal 2.0 V (seeTable 3 for actual recommended core voltage). Voltage to the L2 I/Os and processor interface I/Os areprovided through separate sets of supply pins and may be provided at the voltages shown in Table 2. Theinput voltage threshold for each bus is selected by sampling the state of the voltage select pins BVSEL andL2VSEL during operation. These signals must remain stable during part operation and cannot change. Theoutput voltage will swing from GND to the maximum voltage applied to the OVDD or L2OVDD power pins.
Table 2 describes the input threshold voltage setting.
Table 2. Input Threshold Voltage Setting
PartRevision
BVSEL SignalProcessor Bus
Interface VoltageL2VSEL Signal
L2 BusInterface Voltage
E 0 Not Available 0 Not Available
1 2.5 V/3.3 V 1 2.5 V/3.3 V
Caution: The input threshold selection must agree with the OVDD/L2OVDD voltages supplied.Note: The input threshold settings above are different for all revisions prior to Rev. 2.8 (Rev. E). For moreinformation, refer to Section 1.10.2, “Part Numbers Not Fully Addressed by This Document.”
VIH
GNDGND – 0.3 V
GND – 0.7 VNot to Exceed 10%
(L2)OVDD + 20%
VIL
(L2)OVDD
(L2)OVDD + 5%
of tSYSCLK
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Table 3 provides the recommended operating conditions for the MPC755.
Table 4 provides the package thermal characteristics for the MPC755 and MPC745. The MPC755 wasinitially sampled in a CBGA package, but production units are currently provided in both a CBGA and aPBGA package. Because of the better long-term device-to-board interconnect reliability of the PBGApackage, Motorola recommends use of a PBGA package except where circumstances dictate use of a CBGApackage. The MPC745 is offered in a PBGA package only.
Table 3. Recommended Operating Conditions 1
Characteristic Symbol
Recommended Value
Unit Notes300 MHz, 350 MHz 400 MHz
Min Max Min Max
Core supply voltage VDD 1.80 2.10 1.90 2.10 V 3
PLL supply voltage AVDD 1.80 2.10 1.90 2.10 V 3
L2 DLL supply voltage L2AVDD 1.80 2.10 1.90 2.10 V 3
Processor bussupply voltage
BVSEL = 1 OVDD 2.375 2.625 2.375 2.625 V 2, 4
3.135 3.465 3.135 3.465 5
L2 bus supplyvoltage
L2VSEL = 1 L2OVDD 2.375 2.625 2.375 2.625 V 2, 4
3.135 3.465 3.135 3.465 5
Input voltage Processor bus Vin GND OVDD GND OVDD V
L2 bus Vin GND L2OVDD GND L2OVDD V
JTAG signals Vin GND OVDD GND OVDD V
Die-junction temperature Tj 0 105 0 105 °C
Notes:1. These are the recommended and tested operating conditions. Proper device operation outside of these conditions
is not guaranteed.2. Revisions prior to Rev. 2.8 (Rev. E) offered different I/O voltage support. For more information, refer to
Section 1.10.2, “Part Numbers Not Fully Addressed by This Document.”3. 2.0 V nominal.4. 2.5 V nominal.5. 3.3 V nominal.
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The MPC755 incorporates a thermal management assist unit (TAU) composed of a thermal sensor,digital-to-analog converter, comparator, control logic, and dedicated special-purpose registers (SPRs). SeetheMPC750 RISC Microprocessor Family User’s Manualfor more information on the use of this feature.Specifications for the thermal sensor portion of the TAU are found in Table 5.
Notes:1. Junction temperature is a function of on-chip power dissipation, package thermal resistance, mounting site (board)
temperature, ambient temperature, air flow, power dissipation of other components on the board, and boardthermal resistance.
2. Per SEMI G38-87 and JEDEC JESD51-2 with the single layer board horizontal.3. Per JEDEC JESD51-6 with the board horizontal.4. Thermal resistance between the die and the printed circuit board per JEDEC JESD51-8. Board temperature is
measured on the top surface of the board near the package.5. Thermal resistance between the die and the case top surface as measured by the cold plate method
(MIL SPEC-883 Method 1012.1) with the calculated case temperature. The actual value of RθJC for the part isless than 0.1°C/W.
6. Refer to Section 1.8.8, “Thermal Management Information,” for more details about thermal management.
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Notes:1. The temperature is the junction temperature of the die. The thermal assist unit’s raw output does not indicate an
absolute temperature, but must be interpreted by software to derive the absolute junction temperature. Forinformation about the use and calibration of the TAU, see Motorola Application Note AN1800/D, Programming theThermal Assist Unit in the MPC750 Microprocessor.
2. The comparator settling time value must be converted into the number of CPU clocks that need to be written intothe THRM3 SPR.
3. Guaranteed by design and characterization.
Table 6. DC Electrical SpecificationsAt recommended operating conditions (see Table 3)
CharacteristicNominal
BusVoltage 1
Symbol Min Max Unit Notes
Input high voltage (all inputs exceptSYSCLK)
2.5 VIH 1.6 (L2)OVDD + 0.3 V 2, 3
3.3 VIH 2.0 (L2)OVDD + 0.3 V 2, 3
Input low voltage (all inputs exceptSYSCLK)
2.5 VIL –0.3 0.6 V 2
3.3 VIL –0.3 0.8 V
SYSCLK input high voltage 2.5 KVIH 1.8 OVDD + 0.3 V
Notes:1. Nominal voltages; see Table 3 for recommended operating conditions.2. For processor bus signals, the reference is OVDD while L2OVDD is the reference for the L2 bus signals.3. Excludes test signals (LSSD_MODE, L1_TSTCLK, L2_TSTCLK) and IEEE 1149.1 boundary scan (JTAG) signals.4. Capacitance is periodically sampled rather than 100% tested.5. The leakage is measured for nominal OVDD and VDD, or both OVDD and VDD must vary in the same direction (for
example, both OVDD and VDD vary by either +5% or –5%).
Table 7. Power Consumption for MPC755
Processor (CPU) FrequencyUnit Notes
300 MHz 350 MHz 400 MHz
Full-Power Mode
Typical 3.1 3.6 5.4 W 1, 3, 4
Maximum 4.5 5.3 8.0 W 1, 2
Doze Mode
Maximum 1.8 2.0 2.3 W 1, 2, 4
Nap Mode
Maximum 1.0 1.0 1.0 W 1, 2, 4
Sleep Mode
Maximum 550 550 550 mW 1, 2, 4
Sleep Mode (PLL and DLL Disabled)
Maximum 510 510 510 mW 1, 2
Notes:1. These values apply for all valid processor bus and L2 bus ratios. The values do not include I/O supply power
(OVDD and L2OVDD) or PLL/DLL supply power (AVDD and L2AVDD). OVDD and L2OVDD power is systemdependent, but is typically <10% of VDD power. Worst case power consumption for AVDD = 15 mW andL2AVDD = 15 mW.
2. Maximum power is measured at nominal VDD (see Table 3) while running an entirely cache-resident, contrivedsequence of instructions which keep the execution units maximally busy.
3. Typical power is an average value measured at the nominal recommended VDD (see Table 3) and 65°C in asystem while running a typical code sequence.
4. Not 100% tested. Characterized and periodically sampled.
Table 6. DC Electrical Specifications (continued)At recommended operating conditions (see Table 3)
CharacteristicNominal
BusVoltage 1
Symbol Min Max Unit Notes
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1.4.2 AC Electrical CharacteristicsThis section provides the AC electrical characteristics for the MPC755. After fabrication, functional partsare sorted by maximum processor core frequency as shown in Section 1.4.2.1, “Clock AC Specifications,”and tested for conformance to the AC specifications for that frequency. The processor core frequency isdetermined by the bus (SYSCLK) frequency and the settings of the PLL_CFG[0:3] signals. Parts are soldby maximum processor core frequency; see Section 1.10, “Ordering Information.”
1.4.2.1 Clock AC SpecificationsTable 8 provides the clock AC timing specifications as defined in Figure 3.
Table 8. Clock AC Timing SpecificationsAt recommended operating conditions (see Table 3)
Notes:1. Caution: The SYSCLK frequency and PLL_CFG[0:3] settings must be chosen such that the resulting SYSCLK
(bus) frequency, CPU (core) frequency, and PLL (VCO) frequency do not exceed their respective maximum orminimum operating frequencies. Refer to the PLL_CFG[0:3] signal description in Section 1.8.1, “PLLConfiguration,”for valid PLL_CFG[0:3] settings.
2. Rise and fall times measurements are now specified in terms of slew rates, rather than time to account forselectable I/O bus interface levels. The minimum slew rate of 1 V/ns is equivalent to a 2 ns maximum rise/fall timemeasured at 0.4 and 2.4 V (OVDD = 3.3 V) or a rise/fall time of 1 ns measured at 0.4 and 1.8 V (OVDD = 2.5 V).
3. Timing is guaranteed by design and characterization.4. This represents total input jitter—short term and long term combined—and is guaranteed by design.5. Relock timing is guaranteed by design and characterization. PLL-relock time is the maximum amount of time
required for PLL lock after a stable VDD and SYSCLK are reached during the power-on reset sequence. Thisspecification also applies when the PLL has been disabled and subsequently re-enabled during sleep mode. Alsonote that HRESET must be held asserted for a minimum of 255 bus clocks after the PLL-relock time during thepower-on reset sequence.
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Figure 3 provides the SYSCLK input timing diagram.
Figure 3. SYSCLK Input Timing Diagram
1.4.2.2 Processor Bus AC SpecificationsTable 9 provides the processor bus AC timing specifications for the MPC755 as defined in Figure 4 andFigure 6. Timing specifications for the L2 bus are provided in Section 1.4.2.3, “L2 Clock ACSpecifications.”
Table 9. Processor Bus Mode Selection AC Timing Specifications 1
At recommended operating conditions (see Table 3)
Parameter Symbol 2All Speed Grades
Unit NotesMin Max
Mode select input setup to HRESET tMVRH 8 — tsysclk
3, 4, 5,6, 7
HRESET to mode select input hold tMXRH 0 — ns 3, 4, 6,7, 8
Notes:1. All input specifications are measured from the midpoint of the signal in question to the midpoint of the rising edge
of the input SYSCLK. All output specifications are measured from the midpoint of the rising edge of SYSCLK tothe midpoint of the signal in question. All output timings assume a purely resistive 50-Ω load (see Figure 5). Inputand output timings are measured at the pin; time-of-flight delays must be added for trace lengths, vias, andconnectors in the system.
2. The symbology used for timing specifications herein follows the pattern of t(signal)(state)(reference)(state) for inputs andt(reference)(state)(signal)(state) for outputs. For example, tIVKH symbolizes the time input signals (I) reach the valid state(V) relative to the SYSCLK reference (K) going to the high (H) state or input setup time. And tKHOV symbolizes thetime from SYSCLK (K) going high (H) until outputs (O) are valid (V) or output valid time. Input hold time can beread as the time that the input signal (I) went invalid (X) with respect to the rising clock edge (KH)—note theposition of the reference and its state for inputs—and output hold time can be read as the time from the rising edge(KH) until the output went invalid (OX).
3. The setup and hold time is with respect to the rising edge of HRESET (see Figure 4).4. This specification is for configuration mode select only. Also note that the HRESET must be held asserted for a
minimum of 255 bus clocks after the PLL-relock time during the power-on reset sequence.5. tsysclk is the period of the external clock (SYSCLK) in ns. The numbers given in the table must be multiplied by the
period of SYSCLK to compute the actual time duration (in ns) of the parameter in question.6. Mode select signals are BVSEL, L2VSEL, PLL_CFG[0:3], and TLBISYNC.7. Guaranteed by design and characterization.8. Bus mode select pins must remain stable during operation. Changing the logic states of BVSEL or L2VSEL during
operation will cause the bus mode voltage selection to change. Changing the logic states of the PLL_CFG pinsduring operation will cause the PLL division ratio selection to change. Both of these conditions are consideredoutside the specification and are not supported. Once HRESET is negated the states of the bus mode selectionpins must remain stable.
SYSCLK VMVMVMKVIH
VM = Midpoint Voltage (OVDD/2)
tSYSCLK
tKR tKFtKHKL
KVIL
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SYSCLK to ARTRY high impedance after precharge tKHARPZ — 2 tsysclk 2, 3, 5
Notes:1. Revisions prior to Rev. 2.8 (Rev. E) were limited in performance and did not conform to this specification. For more
information, refer to Section 1.10.2, “Part Numbers Not Fully Addressed by This Document.”2. Guaranteed by design and characterization.3. tsysclk is the period of the external clock (SYSCLK) in ns. The numbers given in the table must be multiplied by the
period of SYSCLK to compute the actual time duration (in ns) of the parameter in question.4. Per the 60x bus protocol, TS, ABB, and DBB are driven only by the currently active bus master. They are asserted
low, then precharged high before returning to high-Z as shown in Figure 6. The nominal precharge width for TS,ABB, or DBB is 0.5 × tsysclk, that is, less than the minimum tsysclk period, to ensure that another master assertingTS, ABB, or DBB on the following clock will not contend with the precharge. Output valid and output hold timing istested for the signal asserted. Output valid time is tested for precharge. The high-Z behavior is guaranteed bydesign.
5. Per the 60x bus protocol, ARTRY can be driven by multiple bus masters through the clock period immediatelyfollowing AACK. Bus contention is not an issue since any master asserting ARTRY will be driving it low. Anymaster asserting it low in the first clock following AACK will then go to high-Z for one clock before precharging ithigh during the second cycle after the assertion of AACK. The nominal precharge width for ARTRY is 1.0 tsysclk;that is, it should be high-Z as shown in Figure 6 before the first opportunity for another master to assert ARTRY.Output valid and output hold timing is tested for the signal asserted. Output valid time is tested for precharge. Thehigh-Z and precharge behavior is guaranteed by design.
6. MCP and SRESET must be held asserted for a minimum of two bus clock cycles; INT and SMI should be heldasserted until the exception is taken; CKSTP_IN must be held asserted until the system has been reset. See theMPC750 RISC Microprocessor Family User’s Manual for more information.
Table 10. Processor Bus AC Timing Specifications 1 (continued)At recommended operating conditions (see Table 3)
Parameter SymbolAll Speed Grades
Unit NotesMin Max
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Figure 6 provides the input/output timing diagram for the MPC755.
Figure 6. Input/Output Timing Diagram
1.4.2.3 L2 Clock AC SpecificationsThe L2CLK frequency is programmed by the L2 configuration register (L2CR[4–6]) core-to-L2 divisorratio. See Table 17 for example core and L2 frequencies at various divisors. Table 11 provides the potentialrange of L2CLK output AC timing specifications as defined in Figure 7.
The minimum L2CLK frequency of Table 11 is specified by the maximum delay of the internal DLL. Thevariable-tap DLL introduces up to a full clock period delay in the L2CLK_OUTA, L2CLK_OUTB, andL2SYNC_OUT signals so that the returning L2SYNC_IN signal is phase-aligned with the next core clock(divided by the L2 divisor ratio). Do not choose a core-to-L2 divisor which results in an L2 frequency belowthis minimum, or the L2CLK_OUT signals provided for SRAM clocking will not be phase-aligned with theMPC755 core clock at the SRAMs.
The maximum L2CLK frequency shown in Table 11 is the core frequency divided by one. Very few L2SRAM designs will be able to operate in this mode, especially at higher core frequencies. Therefore, mostdesigns will select a greater core-to-L2 divisor to provide a longer L2CLK period for read and write accessto the L2 SRAMs. The maximum L2CLK frequency for any application of the MPC755 will be a functionof the AC timings of the MPC755, the AC timings for the SRAM, bus loading, and printed-circuit boardtrace length. The current AC timing of the MPC755 supports up to 200 MHz with typical, similarly-ratedSRAM parts, provided careful design practices are observed. Clock trace lengths must be matched and alltrace lengths should be as short as possible. Higher frequencies can be achieved by using better performingSRAM. Note that revisions of the MPC755 prior to Rev. 2.8 (Rev. E) were limited in performance, and weretypically limited to 175 MHz with similarly-rated SRAM. For more information, see Section 1.10.2, “PartNumbers Not Fully Addressed by This Document.”
SYSCLK
All Inputs
VM
All Outputs tKHOX
VM
(Except TS, ABB,ARTRY, DBB)
TS, ABB, DBB
ARTRY
VM
tKHOZ
tKHABPZ
tKHARPZ
tKHARP
tKHOV
tKHOX
tKHOV
tKHOV
tKHOV
tKHOX
tKHOV
tIVKH
tIXKH
tKHOZ
tKHOE
VM = Midpoint Voltage (OVDD/2 or Vin/2)
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Motorola is similarly limited by system constraints and cannot perform tests of the L2 interface on asocketed part on a functional tester at the maximum frequencies of Table 11. Therefore, functional operationand AC timing information are tested at core-to-L2 divisors of 2 or greater. Functionality of core-to-L2divisors of 1 or 1.5 is verified at less than maximum rated frequencies.
L2 input and output signals are latched or enabled, respectively, by the internal L2CLK (which is SYSCLKmultiplied up to the core frequency and divided down to the L2CLK frequency). In other words, the ACtimings of Table 12 and Table 13 are entirely independent of L2SYNC_IN. In a closed loop system, whereL2SYNC_IN is driven through the board trace by L2SYNC_OUT, L2SYNC_IN only controls the outputphase of L2CLK_OUTA and L2CLK_OUTB which are used to latch or enable data at the SRAMs.However, since in a closed loop system L2SYNC_IN is held in phase alignment with the internal L2CLK,the signals of Table 12 and Table 13 are referenced to this signal rather than the not-externally-visibleinternal L2CLK. During manufacturing test, these times are actually measured relative to SYSCLK.
The L2SYNC_OUT signal is intended to be routed halfway out to the SRAMs and then returned to theL2SYNC_IN input of the MPC755 to synchronize L2CLK_OUT at the SRAM with the processor’s internalclock. L2CLK_OUT at the SRAM can be offset forward or backward in time by shortening or lengtheningthe routing of L2SYNC_OUT to L2SYNC_IN. See Motorola Application Note AN1794/D,Backside L2Timing Analysis for PCB Design Engineers.
The L2CLK_OUTA and L2CLK_OUTB signals should not have more than two loads.
Table 11. L2CLK Output AC Timing SpecificationAt recommended operating conditions (see Table 3)
Notes:1. L2CLK outputs are L2CLK_OUTA, L2CLK_OUTB, L2CLK_OUT, and L2SYNC_OUT pins. The L2CLK
frequency-to-core frequency settings must be chosen such that the resulting L2CLK frequency and core frequencydo not exceed their respective maximum or minimum operating frequencies. The maximum L2LCK frequency willbe system dependent. L2CLK_OUTA and L2CLK_OUTB must have equal loading.
2. The nominal duty cycle of the L2CLK is 50% measured at midpoint voltage.3. The DLL-relock time is specified in terms of L2CLK periods. The number in the table must be multiplied by the
period of L2CLK to compute the actual time duration in ns. Relock timing is guaranteed by design andcharacterization.
4. The L2CR[L2SL] bit should be set for L2CLK frequencies less than 110 MHz. This adds more delay to each tap ofthe DLL.
5. Allowable skew between L2SYNC_OUT and L2SYNC_IN.6. This output jitter number represents the maximum delay of one tap forward or one tap back from the current DLL
tap as the phase comparator seeks to minimize the phase difference between L2SYNC_IN and the internalL2CLK. This number must be comprehended in the L2 timing analysis. The input jitter on SYSCLK affectsL2CLK_OUT and the L2 address/data/control signals equally and, therefore, is already comprehended in the ACtiming and does not have to be considered in the L2 timing analysis.
7. Guaranteed by design.
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The L2CLK_OUT timing diagram is shown in Figure 7.
Figure 7. L2CLK_OUT Output Timing Diagram
1.4.2.4 L2 Bus AC SpecificationsTable 12 provides the L2 bus interface AC timing specifications for the MPC755 as defined in Figure 8 andFigure 9 for the loading conditions described in Figure 10.
Table 12. L2 Bus Interface AC Timing SpecificationsAt recommended operating conditions (see Table 3)
Parameter SymbolAll Speed Grades
Unit NotesMin Max
L2SYNC_IN rise and fall time tL2CR, tL2CF — 1.0 ns 1
Setup times: Data and parity tDVL2CH 1.2 — ns 2
Input hold times: Data and parity tDXL2CH 0 — ns 2
Valid times:All outputs when L2CR[14–15] = 00All outputs when L2CR[14–15] = 01All outputs when L2CR[14–15] = 10All outputs when L2CR[14–15] = 11
tL2CHOV————
3.13.23.33.7
ns 3, 4
Output hold times:All outputs when L2CR[14–15] = 00All outputs when L2CR[14–15] = 01All outputs when L2CR[14–15] = 10All outputs when L2CR[14–15] = 11
tL2CHOX0.50.70.91.1
————
ns 3
VM = Midpoint Voltage (L2OVDD/2)
L2CLK_OUTA
L2CLK_OUTB
L2 Differential Clock Mode
L2 Single-Ended Clock Mode
L2SYNC_OUT
tL2CLKtCHCL
L2CLK_OUTA VM
tL2CR tL2CF
VM
VMVML2CLK_OUTB
VMVM
VM
VM
VM
tL2CLK
L2SYNC_OUT
VM VM VM
VM VM VM
VM
VM
tL2CSKW
tCHCL
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Figure 8 shows the L2 bus input timing diagrams for the MPC755.
Figure 8. L2 Bus Input Timing Diagrams
Figure 9 shows the L2 bus output timing diagrams for the MPC755.
Figure 9. L2 Bus Output Timing Diagrams
L2SYNC_IN to high impedance:All outputs when L2CR[14–15] = 00All outputs when L2CR[14–15] = 01All outputs when L2CR[14–15] = 10All outputs when L2CR[14–15] = 11
tL2CHOZ————
2.42.62.83.0
ns 3, 5
Notes:1. Rise and fall times for the L2SYNC_IN input are measured from 20% to 80% of L2OVDD.2. All input specifications are measured from the midpoint of the signal in question to the midpoint voltage of the
rising edge of the input L2SYNC_IN (see Figure 8). Input timings are measured at the pins.3. All output specifications are measured from the midpoint voltage of the rising edge of L2SYNC_IN to the midpoint
of the signal in question. The output timings are measured at the pins. All output timings assume a purely resistive50-Ω load (see Figure 10).
4. The outputs are valid for both single-ended and differential L2CLK modes. For pipelined registered synchronousBurstRAMs, L2CR[14–15] = 01 or 10 is recommended. For pipelined late write synchronous BurstRAMs,L2CR[14–15] = 11 is recommended.
5. Guaranteed by design and characterization.6. Revisions prior to Rev. 2.8 (Rev. E) were limited in performance and did not conform to this specification. For more
information, refer to Section 1.10.2, “Part Numbers Not Fully Addressed by This Document.”
Table 12. L2 Bus Interface AC Timing Specifications (continued)At recommended operating conditions (see Table 3)
Parameter SymbolAll Speed Grades
Unit NotesMin Max
L2SYNC_IN
L2 Data and Data
VM
VM = Midpoint Voltage (L2OVDD/2)
tDVL2CHtDXL2CH
tL2CR tL2CF
Parity Inputs
L2SYNC_IN
All Outputs
VM
VM = Midpoint Voltage (L2OVDD/2)
tL2CHOVtL2CHOX
VM
L2DATA BUS
tL2CHOZ
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Figure 10 provides the AC test load for L2 interface of the MPC755.
Figure 10. AC Test Load for the L2 Interface
1.4.2.5 IEEE 1149.1 AC Timing SpecificationsTable 13 provides the IEEE 1149.1 (JTAG) AC timing specifications as defined in Figure 12 throughFigure 15.
Figure 11 provides the AC test load for TDO and the boundary-scan outputs of the MPC755.
Figure 11. AC Test Load for the JTAG Interface
Table 13. JTAG AC Timing Specifications (Independent of SYSCLK) 1
At recommended operating conditions (see Table 3)
Parameter Symbol Min Max Unit Notes
TCK frequency of operation fTCLK 0 16 MHz
TCK cycle time tTCLK 62.5 — ns
TCK clock pulse width measured at 1.4 V tJHJL 31 — ns
TCK rise and fall times tJR, tJF 0 2 ns
TRST assert time tTRST 25 — ns 2
Input setup times: Boundary-scan dataTMS, TDI
tDVJHtIVJH
40
——
ns 3
Input hold times: Boundary-scan dataTMS, TDI
tDXJHtIXJH
1512
——
ns 3
Valid times: Boundary-scan dataTDO
tJLDVtJLOV
——
44
ns 4
Output hold times: Boundary-scan dataTDO
tJLDHtJLOH
2512
——
ns 4
TCK to output high impedance: Boundary-scan dataTDO
tJLDZtJLOZ
33
199
ns 4, 5
Notes:1. All outputs are measured from the midpoint voltage of the falling/rising edge of TCLK to the midpoint of the signal
in question. The output timings are measured at the pins. All output timings assume a purely resistive 50-Ω load(see Figure 11). Time-of-flight delays must be added for trace lengths, vias, and connectors in the system.
2. TRST is an asynchronous level sensitive signal which must be asserted for this minimum time to be recognized.3. Non-JTAG signal input timing with respect to TCK.4. Non-JTAG signal output timing with respect to TCK.5. Guaranteed by design and characterization.
Output Z0 = 50 Ω L2OVDD/2RL = 50 Ω
Output Z0 = 50 Ω OVDD/2RL = 50 Ω
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1.5 Pin AssignmentsFigure 16 (in Part A) shows the pinout of the MPC745, 255 PBGA package as viewed from the top surface.Part B shows the side profile of the PBGA package to indicate the direction of the top surface view.
Part A
Figure 16. Pinout of the MPC745, 255 PBGA Package as Viewed from the Top Surface
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Not to Scale
ViewPart B
Die
Substrate Assembly
Encapsulant
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Figure 17 (in Part A) shows the pinout of the MPC755, 360 PBGA and 360 CBGA packages as viewed fromthe top surface. Part B shows the side profile of the PBGA and CBGA package to indicate the direction ofthe top surface view.
Part A
Figure 17. Pinout of the MPC755, 360 PBGA and CBGA Packages as Viewed from the Top Surface
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Not to Scale
17 18 19
U
V
W
ViewPart B
Die
Substrate Assembly
Encapsulant
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Table 15 provides the pinout listing for the MPC755, 360 PBGA and CBGA packages.
VOLTDET F3 High Output — 6
Notes:1. OVDD supplies power to the processor bus, JTAG, and all control signals; and VDD supplies power to the
processor core and the PLL (after filtering to become AVDD). These columns serve as a reference for the nominalvoltage supported on a given signal as selected by the BVSEL pin configuration of Table 2 and the voltagesupplied. For actual recommended value of Vin or supply voltages, see Table 3.
2. These are test signals for factory use only and must be pulled up to OVDD for normal machine operation.3. This pin must be pulled up to OVDD for proper operation of the processor interface. To allow for future I/O voltage
changes, provide the option to connect BVSEL independently to either OVDD or GND.4. Uses 1 of 15 existing no connects in the MPC740, 255 BGA package.5. Internal pull-up on die.6. Internally tied to GND in the MPC745, 255 BGA package to indicate to the power supply that a low-voltage
processor is present. This signal is not a power supply input.Caution: This differs from the MPC755, 360 BGA package.
Table 15. Pinout Listing for the MPC755, 360 BGA Package
Signal Name Pin Number Active I/O I/F Voltage 1 Notes
1.7 Package DescriptionThe following sections provide the package parameters and mechanical dimensions for the MPC745, 255PBGA package, as well as the MPC755, 360 CBGA and PBGA packages. While both the MPC755 plasticand ceramic packages are described here, both packages are not guaranteed to be available at the same time.All new designs should allow for either ceramic or plastic BGA packages for this device. For moreinformation on designing a common footprint for both plastic and ceramic package types, see theMotorolaFlip-Chip Plastic Ball Grid Array Presentation. The MPC755 was initially sampled in a CBGA package,but production units are currently provided in both a CBGA and a PBGA package. Because of the betterlong-term device-to-board interconnect reliability of the PBGA package, Motorola recommends use of aPBGA package except where circumstances dictate use of a CBGA package.
1.7.1 Package Parameters for the MPC745 PBGAThe package parameters are as provided in the following list. The package type is 21× 21 mm, 255-leadplastic ball grid array (PBGA).
Package outline 21× 21 mm
Interconnects 255 (16× 16 ball array – 1)
Pitch 1.27 mm (50 mil)
Minimum module height 2.25 mm
Maximum module height 2.80 mm
Ball diameter (typical) 0.75 mm (29.5 mil)
VOLTDET K13 High Output L2OVDD 8
Notes:1. OVDD supplies power to the processor bus, JTAG, and all control signals except the L2 cache controls (L2CE,
L2WE, and L2ZZ); L2OVDD supplies power to the L2 cache interface (L2ADDR[0:16], L2DATA[0:63], L2DP[0:7],and L2SYNC_OUT) and the L2 control signals; and VDD supplies power to the processor core and the PLL andDLL (after filtering to become AVDD and L2AVDD, respectively). These columns serve as a reference for thenominal voltage supported on a given signal as selected by the BVSEL/L2VSEL pin configurations of Table 2 andthe voltage supplied. For actual recommended value of Vin or supply voltages, see Table 3.
2. These are test signals for factory use only and must be pulled up to OVDD for normal machine operation.3. This pin must be pulled up to OVDD for proper operation of the processor interface. To allow for future I/O voltage
changes, provide the option to connect BVSEL independently to either OVDD or GND.4. These pins are reserved for potential future use as additional L2 address pins.5. Uses one of nine existing no connects in the MPC750, 360 BGA package.6. Internal pull-up on die.7. This pin must be pulled up to L2OVDD for proper operation of the processor interface. To allow for future I/O
voltage changes, provide the option to connect L2VSEL independently to either L2OVDD or GND.8. Internally tied to L2OVDD in the MPC755, 360 BGA package to indicate the power present at the L2 cache
interface. This signal is not a power supply input.Caution: This differs from the MPC745, 255 BGA package.
Table 15. Pinout Listing for the MPC755, 360 BGA Package (continued)
Signal Name Pin Number Active I/O I/F Voltage 1 Notes
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1.7.2 Mechanical Dimensions for the MPC745 PBGAFigure 18 provides the mechanical dimensions and bottom surface nomenclature for the MPC745, 255PBGA package.
Figure 18. Mechanical Dimensions and Bottom Surface Nomenclature for the MPC745,255 PBGA Package
NOTES:1. DIMENSIONING AND TOLERANCING
PER ASME Y14.5M, 1994.2. DIMENSIONS IN MILLIMETERS.3. TOP SIDE A1 CORNER INDEX IS A
METALIZED FEATURE WITH VARIOUSSHAPES. BOTTOM SIDE A1 CORNER ISDESIGNATED WITH A BALL MISSINGFROM THE ARRAY.
4. CAPACITOR PADS MAY BEUNPOPULATED.
Millimeters
DIM Min Max
A 2.25 2.80
A1 0.50 0.70
A2 1.00 1.20
A3 — 0.60
b 0.60 0.90
D 21.00 BSC
D1 6.75
E 21.00 BSC
E1 7.87
e 1.27 BSC
0.2
D
2X
A1 CORNER
E
0.2
B
A
C
0.2 C
BC
255Xe
1 2 3 4 5 6 7 8 9 10 111213141516
ABCDEFGHJKLMNPRT
A0.3
C0.15
b
E1
D1
AA1
A2
A31
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1.7.3 Package Parameters for the MPC755 CBGAThe package parameters are as provided in the following list. The package type is 25× 25 mm, 360-leadceramic ball grid array (CBGA).
Package outline 25× 25 mm
Interconnects 360 (19× 19 ball array – 1)
Pitch 1.27 mm (50 mil)
Minimum module height 2.65 mm
Maximum module height 3.20 mm
Ball diameter 0.89 mm (35 mil)
1.7.4 Mechanical Dimensions for the MPC755 CBGAFigure 19 provides the mechanical dimensions and bottom surface nomenclature for the MPC755, 360CBGA package.
Figure 19. Mechanical Dimensions and Bottom Surface Nomenclature for the MPC755,360 CBGA Package
NOTES:1. DIMENSIONING AND TOLERANCING
PER ASME Y14.5M, 1994.2. DIMENSIONS IN MILLIMETERS.3. TOP SIDE A1 CORNER INDEX IS A
METALIZED FEATURE WITH VARIOUSSHAPES. BOTTOM SIDE A1 CORNER ISDESIGNATED WITH A BALL MISSINGFROM THE ARRAY.
BC
360X
e
1 2 3 4 5 6 7 8 9 10 111213141516
ABCDEFGHJKLMNPRT
A0.3
C0.15b
AA1
A2
C
0.2 C
171819
U
WV
Millimeters
DIM Min Max
A 2.65 3.20
A1 0.79 0.99
A2 1.10 1.30
A3 — 0.60
b 0.82 0.93
D 25.00 BSC
D1 6.75
E 25.00 BSC
E1 7.87
e 1.27 BSC
0.2
D
2X
A1 CORNER
E
0.22X
A
E1
D1
A3
1
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1.7.5 Package Parameters for the MPC755 PBGAThe package parameters are as provided in the following list. The package type is 25× 25 mm, 360-leadplastic ball grid array (PBGA).
Package outline 25× 25 mm
Interconnects 360 (19× 19 ball array – 1)
Pitch 1.27 mm (50 mil)
Minimum module height 2.22 mm
Maximum module height 2.77 mm
Ball diameter 0.75 mm (29.5 mil)
1.7.6 Mechanical Dimensions for the MPC755Figure 20 provides the mechanical dimensions and bottom surface nomenclature for the MPC755, 360PBGA package.
Figure 20. Mechanical Dimensions and Bottom Surface Nomenclature for the MPC755,360 PBGA Package
NOTES:1. DIMENSIONING AND TOLERANCING
PER ASME Y14.5M, 1994.2. DIMENSIONS IN MILLIMETERS.3. TOP SIDE A1 CORNER INDEX IS A
METALIZED FEATURE WITH VARIOUSSHAPES. BOTTOM SIDE A1 CORNER ISDESIGNATED WITH A BALL MISSINGFROM THE ARRAY.
0.2
BC360X
D
2X
A1 CORNER
E
e
0.22X
B
A
1 2 3 4 5 6 7 8 9 10 111213141516
ABCDEFGHJKLMNPRT
A0.3
C0.15b
C
0.2 C
171819
U
WV
Millimeters
DIM Min Max
A 2.22 2.77
A1 0.50 0.70
A2 1.00 1.20
A3 — 0.60
b 0.60 0.90
D 25.00 BSC
D1 6.75
E 25.00 BSC
E1 7.87
e 1.27 BSC
E1
D1
AA1
A2
A3
1
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1.8 System Design InformationThis section provides electrical and thermal design recommendations for successful application of theMPC755.
1.8.1 PLL ConfigurationThe MPC755 PLL is configured by the PLL_CFG[0:3] signals. For a given SYSCLK (bus) frequency, thePLL configuration signals set the internal CPU and VCO frequency of operation. These must be chosen suchthat they comply with Table 8. Table 16 shows the valid configurations of these signals and an exampleillustrating the core and VCO frequencies resulting from various PLL configurations and example busfrequencies. In this example, shaded cells represent settings that, for a given SYSCLK frequency, result incore and/or VCO frequencies that do not comply with the 400-MHz column in Table 8.
Table 16. MPC755 Microprocessor PLL Configuration Example for 400 MHz Parts
PLL_CFG[0:3]
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
The MPC755 generates the clock for the external L2 synchronous data SRAMs by dividing the core clockfrequency of the MPC755. The divided-down clock is then phase-adjusted by an on-chip delay-lock-loop(DLL) circuit and should be routed from the MPC755 to the external RAMs. A separate clock output,L2SYNC_OUT is sent out half the distance to the SRAMs and then returned as an input to the DLL on pinL2SYNC_IN so that the rising-edge of the clock as seen at the external RAMs can be aligned to the clockingof the internal latches in the L2 bus interface.
The core-to-L2 frequency divisor for the L2 PLL is selected through the L2CLK bits of the L2CR register.Generally, the divisor must be chosen according to the frequency supported by the external RAMs, thefrequency of the MPC755 core, and the phase adjustment range that the L2 DLL supports. Table 17 showsvarious example L2 clock frequencies that can be obtained for a given set of core frequencies. The minimumL2 frequency target is 80 MHz.
1111 PLL off PLL off, no core clocking occurs
Notes:1. PLL_CFG[0:3] settings not listed are reserved.2. The sample bus-to-core frequencies shown are for reference only. Some PLL configurations may select bus, core,
or VCO frequencies which are not useful, not supported, or not tested for by the MPC755; see Section 1.4.2.1,“Clock AC Specifications,” for valid SYSCLK, core, and VCO frequencies.
3. In PLL-bypass mode, the SYSCLK input signal clocks the internal processor directly, the PLL is disabled, and thebus mode is set for 1:1 mode operation. This mode is intended for factory use and emulator tool use only.Note: The AC timing specifications given in this document do not apply in PLL-bypass mode.
4. In PLL off mode, no clocking occurs inside the MPC755 regardless of the SYSCLK input.
Table 17. Sample Core-to-L2 Frequencies
Core Frequency (MHz) ÷1 ÷1.5 ÷2 ÷2.5 ÷3
250 250 166 125 100 83
266 266 177 133 106 89
275 275 183 138 110 92
300 300 200 150 120 100
325 325 217 163 130 108
333 333 222 167 133 111
350 350 233 175 140 117
366 366 244 183 146 122
375 375 250 188 150 125
400 400 266 200 160 133
Note: The core and L2 frequencies are for reference only. Some examples mayrepresent core or L2 frequencies which are not useful, not supported, or nottested for by the MPC755; see Section 1.4.2.3, “L2 Clock AC Specifications,” forvalid L2CLK frequencies. The L2CR[L2SL] bit should be set for L2CLKfrequencies less than 110 MHz.
Table 16. MPC755 Microprocessor PLL Configuration Example for 400 MHz Parts (continued)
PLL_CFG[0:3]
Example Bus-to-Core Frequency in MHz (VCO Frequency in MHz)
Bus-to-Core
Multiplier
Core-to-VCO
Multiplier
Bus33 MHz
Bus50 MHz
Bus66 MHz
Bus75 MHz
Bus80 MHz
Bus100 MHz
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1.8.2 PLL Power Supply FilteringThe AVDD and L2AVDD power signals are provided on the MPC755 to provide power to the clockgeneration PLL and L2 cache DLL, respectively. To ensure stability of the internal clock, the power suppliedto the AVDD input signal should be filtered of any noise in the 500 kHz to 10 MHz resonant frequency rangeof the PLL. A circuit similar to the one shown in Figure 21 using surface mount capacitors with minimumEffective Series Inductance (ESL) is recommended. Consistent with the recommendations of Dr. HowardJohnson inHigh Speed Digital Design: A Handbook of Black Magic(Prentice Hall, 1993), multiple smallcapacitors of equal value are recommended over a single large value capacitor.
The circuit should be placed as close as possible to the AVDD pin to minimize noise coupled from nearbycircuits. An identical but separate circuit should be placed as close as possible to the L2AVDD pin. It is oftenpossible to route directly from the capacitors to the AVDD pin, which is on the periphery of the 360 BGAfootprint, without the inductance of vias. The L2AVDD pin may be more difficult to route, but isproportionately less critical.
Figure 21 shows the PLL power supply filter circuit.
Figure 21. PLL Power Supply Filter Circuit
1.8.3 Decoupling RecommendationsDue to the MPC755 dynamic power management feature, large address and data buses, and high operatingfrequencies, the MPC755 can generate transient power surges and high frequency noise in its power supply,especially while driving large capacitive loads. This noise must be prevented from reaching othercomponents in the MPC755 system, and the MPC755 itself requires a clean, tightly regulated source ofpower. Therefore, it is recommended that the system designer place at least one decoupling capacitor at eachVDD, OVDD, and L2OVDD pin of the MPC755. It is also recommended that these decoupling capacitorsreceive their power from separate VDD, (L2)OVDD, and GND power planes in the PCB, utilizing shorttraces to minimize inductance.
These capacitors should have a value of 0.01 or 0.1 µF. Only ceramic SMT (surface mount technology)capacitors should be used to minimize lead inductance, preferably 0508 or 0603 orientations whereconnections are made along the length of the part.
In addition, it is recommended that there be several bulk storage capacitors distributed around the PCB,feeding the VDD, L2OVDD, and OVDD planes, to enable quick recharging of the smaller chip capacitors.These bulk capacitors should have a low ESR (equivalent series resistance) rating to ensure the quickresponse time necessary. They should also be connected to the power and ground planes through two viasto minimize inductance. Suggested bulk capacitors:100–330 µF (AVX TPS tantalum or Sanyo OSCON).
1.8.4 Connection RecommendationsTo ensure reliable operation, it is highly recommended to connect unused inputs to an appropriate signallevel through a resistor. Unused active low inputs should be tied to OVDD. Unused active high inputs shouldbe connected to GND. All NC (no connect) signals must remain unconnected.
VDD AVDD (or L2AVDD)10 Ω
2.2 µF 2.2 µF
GND
Low ESL Surface Mount Capacitors
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Power and ground connections must be made to all external VDD, OVDD, L2OVDD, and GND pins of theMPC755. Note that power must be supplied to L2OVDD even if the L2 interface of the MPC755 will not beused; it is recommended to connect L2OVDD to OVDD and L2VSEL to BVSEL if the L2 interface is unused.(This requirement does not apply to the MPC745 since it has neither an L2 interface nor L2OVDD pins.)
1.8.5 Output Buffer DC ImpedanceThe MPC755 60x and L2 I/O drivers are characterized over process, voltage, and temperature. To measureZ0, an external resistor is connected from the chip pad to (L2)OVDD or GND. Then, the value of eachresistor is varied until the pad voltage is (L2)OVDD/2 (see Figure 22).
The output impedance is the average of two components, the resistances of the pull-up and pull-downdevices. When data is held low, SW2 is closed (SW1 is open), and RN is trimmed until the voltage at thepad equals (L2)OVDD/2. RN then becomes the resistance of the pull-down devices. When data is held high,SW1 is closed (SW2 is open), and RP is trimmed until the voltage at the pad equals (L2)OVDD/2. RP thenbecomes the resistance of the pull-up devices.
Figure 22 describes the driver impedance measurement circuit described above.
Figure 22. Driver Impedance Measurement Circuit
Alternately, the following is another method to determine the output impedance of the MPC755. A voltagesource, Vforce, is connected to the output of the MPC755 as shown in Figure 23. Data is held low, the voltagesource is set to a value that is equal to (L2)OVDD/2 and the current sourced by Vforce is measured. Thevoltage drop across the pull-down device, which is equal to (L2)OVDD/2, is divided by the measured currentto determine the output impedance of the pull-down device, RN. Similarly, the impedance of the pull-updevice is determined by dividing the voltage drop of the pull-up, (L2)OVDD/2, by the current sank by thepull-up when the data is high and Vforce is equal to (L2)OVDD/2. This method can be employed with eitherempirical data from a test setup or with data from simulation models, such as IBIS.
RP and RN are designed to be close to each other in value. Then Z0 = (RP + RN)/2.
Figure 23 describes the alternate driver impedance measurement circuit.
(L2)OVDD
OGND
RP
RN
PadData
SW1
SW2
(L2)OVDD
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Table 18 summarizes the signal impedance results. The driver impedance values were characterized at 0°,65°, and 105°C. The impedance increases with junction temperature and is relatively unaffected by busvoltage.
1.8.6 Pull-Up Resistor RequirementsThe MPC755 requires pull-up resistors (1−5 kΩ) on several control pins of the bus interface to maintain thecontrol signals in the negated state after they have been actively negated and released by the MPC755 orother bus masters. These pins are TS, ABB, AACK, ARTRY, DBB, DBWO, TA, TEA, and DBDIS. DRTRYshould also be connected to a pull-up resistor (1−5 kΩ) if it will be used by the system; otherwise, this signalshould be connected to HRESETto select NO-DRTRY mode (see theMPC750 RISC MicroprocessorFamily User’s Manualfor more information on this mode).
Three test pins also require pull-up resistors (100Ω−1 kΩ). These pins are L1_TSTCLK, L2_TSTCLK,and LSSD_MODE. These signals are for factory use only and must be pulled up to OVDD for normalmachine operation.
In addition, CKSTP_OUTis an open-drain style output that requires a pull-up resistor (1−5 kΩ) if it is usedby the system.
During inactive periods on the bus, the address and transfer attributes may not be driven by any master andmay, therefore, float in the high-impedance state for relatively long periods of time. Since the MPC755 mustcontinually monitor these signals for snooping, this float condition may cause additional power draw by theinput receivers on the MPC755 or by other receivers in the system. These signals can be pulled up throughweak (10-kΩ) pull-up resistors by the system or may be otherwise driven by the system during inactiveperiods of the bus to avoid this additional power draw, but address bus pull-up resistors are not neccessary
for proper device operation. The snooped address and transfer attribute inputs are: A[0:31], AP[0:3],TT[0:4], TBST, and GBL.
The data bus input receivers are normally turned off when no read operation is in progress and, therefore,do not require pull-up resistors on the bus. Other data bus receivers in the system, however, may requirepull-ups, or that those signals be otherwise driven by the system during inactive periods by the system. Thedata bus signals are: DH[0:31], DL[0:31], and DP[0:7].
If 32-bit data bus mode is selected, the input receivers of the unused data and parity bits will be disabled,and their outputs will drive logic zeros when they would otherwise normally be driven. For this mode, thesepins do not require pull-up resistors, and should be left unconnected by the system to minimize possibleoutput switching.
If address or data parity is not used by the system, and the respective parity checking is disabled throughHID0, the input receivers for those pins are disabled, and those pins do not require pull-up resistors andshould be left unconnected by the system. If all parity generation is disabled through HID0, then all paritychecking should also be disabled through HID0, and all parity pins may be left unconnected by the system.
The L2 interface does not require pull-up resistors.
1.8.7 JTAG Configuration SignalsBoundary scan testing is enabled through the JTAG interface signals. The TRSTsignal is optional in theIEEE 1149.1 specification, but is provided on all processors that implement the PowerPC architecture.While it is possible to force the TAP controller to the reset state using only the TCK and TMS signals, morereliable power-on reset performance will be obtained if the TRSTsignal is asserted during power-on reset.Because the JTAG interface is also used for accessing the common on-chip processor (COP) function,simply tying TRSTto HRESETis not practical.
The COP function of these processors allows a remote computer system (typically, a PC with dedicatedhardware and debugging software) to access and control the internal operations of the processor. The COPinterface connects primarily through the JTAG port of the processor, with some additional status monitoringsignals. The COP port requires the ability to independently assert HRESETor TRSTin order to fully controlthe processor. If the target system has independent reset sources, such as voltage monitors, watchdog timers,power supply failures, or push-button switches, then the COP reset signals must be merged into these signalswith logic.
The arrangement shown in Figure 24 allows the COP port to independently assert HRESETor TRST, whileensuring that the target can drive HRESETas well. If the JTAG interface and COP header will not be used,TRSTshould be tied to HRESETthrough a 0-Ω isolation resistor so that it is asserted when the system resetsignal (HRESET) is asserted ensuring that the JTAG scan chain is initialized during power-on. WhileMotorola recommends that the COP header be designed into the system as shown in Figure 24, if this is notpossible, the isolation resistor will allow future access to TRSTin the case where a JTAG interface may needto be wired onto the system in debug situations.
The COP header shown in Figure 24 adds many benefits—breakpoints, watchpoints, register and memoryexamination/modification, and other standard debugger features are possible through this interface—andcan be as inexpensive as an unpopulated footprint for a header to be added when needed.
The COP interface has a standard header for connection to the target system, based on the 0.025"square-post 0.100" centered header assembly (often called a Berg header). The connector typically has pin14 removed as a connector key.
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There is no standardized way to number the COP header shown in Figure 24; consequently, many differentpin numbers have been observed from emulator vendors. Some are numbered top-to-bottom thenleft-to-right, while others use left-to-right then top-to-bottom, while still others number the pins counter
HRESETHRESET
From TargetBoard Sources
13SRESET
SRESETSRESET
NC
NC
11
VDD_SENSE6
5 1
15
2 kΩ 10 kΩ
10 kΩ
10 kΩ
OVDD
OVDD
OVDD
OVDDCHKSTP_IN
CHKSTP_IN8TMS
TDO
TDI
TCK
TMS
TDO
TDI
TCK
9
1
3
4TRST
7
16
2
10
12
(if any)
CO
PH
eade
r
14 2Key
QACK
OVDD
OVDD
10 kΩOVDD
TRST
10 kΩOVDD
10 kΩ
10 kΩ
QACK
QACK
CHKSTP_OUTCHKSTP_OUT
3
13
9
5
1
6
10
2
15
11
7
16
12
8
4
KEYNo pin
COP ConnectorPhysical Pin Out
10 kΩ 4OVDD
1
2 kΩ 3
0 Ω 5
Notes:1. RUN/STOP, normally found on pin 5 of the COP header, is not implemented on the MPC755. Connect
pin 5 of the COP header to OVDD with a 10-kΩ pull-up resistor.2. Key location; pin 14 is not physically present on the COP header.3. Component not populated. Populate only if debug tool does not drive QACK.4. Populate only if debug tool uses an open-drain type output and does not actively deassert QACK.5. If the JTAG interface is implemented, connect HRESET from the target source to TRST from the COP
header though an AND gate to TRST of the part. If the JTAG interface is not implemented, connectHRESET from the target source to TRST of the part through a 0-Ω isolation reisistor.
HRESET
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clockwise from pin 1 (as with an IC). Regardless of the numbering, the signal placement recommended inFigure 25 is common to all known emulators.
The QACKsignal shown in Figure 24 is usually connected to the PCI bridge chip in a system and is an inputto the MPC755 informing it that it can go into the quiescent state. Under normal operation this occurs duringa low-power mode selection. In order for COP to work, the MPC755 must see this signal asserted (pulleddown). While shown on the COP header, not all emulator products drive this signal. If the product does not,a pull-down resistor can be populated to assert this signal. Additionally, some emulator products implementopen-drain type outputs and can only drive QACKasserted; for these tools, a pull-up resistor can beimplemented to ensure this signal is deasserted when it is not being driven by the tool. Note that the pull-upand pull-down resistors on the QACKsignal are mutually exclusive and it is never necessary to populateboth in a system. To preserve correct power-down operation, QACKshould be merged via logic so that italso can be driven by the PCI bridge.
1.8.8 Thermal Management InformationThis section provides thermal management information for the ceramic ball grid array (CBGA) package forair-cooled applications. Proper thermal control design is primarily dependent on the system-leveldesign—the heat sink, airflow, and thermal interface material. To reduce the die-junction temperature, heatsinks may be attached to the package by several methods—adhesive, spring clip to holes in theprinted-circuit board or package, and mounting clip and screw assembly; see Figure 25. This spring forceshould not exceed 5.5 pounds of force.
Figure 25 describes the package exploded cross-sectional view with several heat sink options.
Figure 25. Package Exploded Cross-Sectional View with Several Heat Sink Options
The board designer can choose between several types of heat sinks to place on the MPC755. There areseveral commercially-available heat sinks for the MPC755 provided by the following vendors:
Ultimately, the final selection of an appropriate heat sink depends on many factors, such as thermalperformance at a given air velocity, spatial volume, mass, attachment method, assembly, and cost.
1.8.8.1 Internal Package Conduction ResistanceFor the exposed-die packaging technology, shown in Table 4, the intrinsic conduction thermal resistancepaths are as follows:
• The die junction-to-case (or top-of-die for exposed silicon) thermal resistance
• The die junction-to-ball thermal resistance
Figure 26 depicts the primary heat transfer path for a package with an attached heat sink mounted to aprinted-circuit board.
Heat generated on the active side of the chip is conducted through the silicon, then through the heat sinkattach material (or thermal interface material), and finally to the heat sink where it is removed by forced-airconvection.
Since the silicon thermal resistance is quite small, for a first-order analysis, the temperature drop in thesilicon may be neglected. Thus, the heat sink attach material and the heat sink conduction/convectivethermal resistances are the dominant terms.
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Figure 26. C4 Package with Heat Sink Mounted to a Printed-Circuit Board
1.8.8.2 Adhesives and Thermal Interface MaterialsA thermal interface material is recommended at the package lid-to-heat sink interface to minimize thethermal contact resistance. For those applications where the heat sink is attached by spring clip mechanism,Figure 27 shows the thermal performance of three thin-sheet thermal-interface materials (silicone,graphite/oil, floroether oil), a bare joint, and a joint with thermal grease as a function of contact pressure.As shown, the performance of these thermal interface materials improves with increasing contact pressure.The use of thermal grease significantly reduces the interface thermal resistance. That is, the bare joint resultsin a thermal resistance approximately seven times greater than the thermal grease joint.
Heat sinks are attached to the package by means of a spring clip to holes in the printed-circuit board (seeFigure 25). This spring force should not exceed 5.5 pounds of force. Therefore, the synthetic grease offersthe best thermal performance, considering the low interface pressure. Of course, the selection of any thermalinterface material depends on many factors—thermal performance requirements, manufacturability, servicetemperature, dielectric properties, cost, etc.
Figure 27 describes the thermal performance of select thermal interface materials.
External Resistance
External Resistance Radiation Convection
Radiation Convection
Heat Sink
Printed-Circuit Board
Thermal Interface Material
(Note the internal versus external package resistance.)
Internal Resistance Die/Package
Package/LeadsDie Junction
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Figure 27. Thermal Performance of Select Thermal Interface Materials
The board designer can choose between several types of thermal interface. Heat sink adhesive materialsshould be selected based on high conductivity, yet adequate mechanical strength to meet equipmentshock/vibration requirements. There are several commercially-available thermal interfaces and adhesivematerials provided by the following vendors:
The Bergquist Company 800-347-457218930 West 78th St.Chanhassen, MN 55317Internet: www.bergquistcompany.com
Chomerics, Inc. 781-935-485077 Dragon Ct.Woburn, MA 01888-4014Internet: www.chomerics.com
Dow-Corning Corporation 800-248-2481Dow-Corning Electronic Materials2200 W. Salzburg Rd.Midland, MI 48686-0997Internet: www.dow.com
Shin-Etsu MicroSi, Inc. 888-642-767410028 S. 51st St.Phoenix, AZ 85044Internet: www.microsi.com
Thermagon Inc. 888-246-90504707 Detroit Ave.Cleveland, OH 44102Internet: www.thermagon.com
1.8.8.3 Heat Sink Selection ExampleThis section provides a heat sink selection example using one of the commercially-available heat sinks. Forpreliminary heat sink sizing, the die-junction temperature can be expressed as follows:
Tj = Ta + Tr + (θjc + θint + θsa) × Pd
where:
Tj is the die-junction temperature
Ta is the inlet cabinet ambient temperature
Tr is the air temperature rise within the computer cabinet
θjc is the junction-to-case thermal resistance
θint is the adhesive or interface material thermal resistance
θsais the heat sink base-to-ambient thermal resistance
Pd is the power dissipated by the device
During operation the die-junction temperatures (Tj) should be maintained less than the value specified inTable 3. The temperature of air cooling the component greatly depends on the ambient inlet air temperatureand the air temperature rise within the electronic cabinet. An electronic cabinet inlet-air temperature (Ta)may range from 30° to 40°C. The air temperature rise within a cabinet (Tr) may be in the range of 5° to 10°C.The thermal resistance of the thermal interface material (θint) is typically about 1°C/W. Assuming a Ta of30°C, a Tr of 5°C, a CBGA package Rθjc < 0.1, and a power consumption (Pd) of 5.0 W, the followingexpression for Tj is obtained:
resulting in a die-junction temperature of approximately 76°C which is well within the maximum operatingtemperature of the component.
Other heat sinks offered by Aavid Thermalloy, Alpha Novatech, The Bergquist Company, IERC, ChipCoolers, and Wakefield Engineering offer different heat sink-to-ambient thermal resistances, and may ormay not need airflow.
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Though the die junction-to-ambient and the heat sink-to-ambient thermal resistances are a commonfigure-of-merit used for comparing the thermal performance of various microelectronic packagingtechnologies, one should exercise caution when only using this metric in determining thermal managementbecause no single parameter can adequately describe three-dimensional heat flow. The final die-junctionoperating temperature, is not only a function of the component-level thermal resistance, but the system-leveldesign and its operating conditions. In addition to the component's power consumption, a number of factorsaffect the final operating die-junction temperature—airflow, board population (local heat flux of adjacentcomponents), heat sink efficiency, heat sink attach, heat sink placement, next-level interconnect technology,system air temperature rise, altitude, etc.
Due to the complexity and the many variations of system-level boundary conditions for today'smicroelectronic equipment, the combined effects of the heat transfer mechanisms (radiation, convection,and conduction) may vary widely. For these reasons, we recommend using conjugate heat transfer modelsfor the board, as well as, system-level designs.
1
3
5
7
8
0 0.5 1 1.5 2 2.5 3 3.5
Thermalloy #2328B Pin-Fin Heat Sink
Approach Air Velocity (m/s)
(25 × 28 × 15 mm)
2
4
6H
eatS
ink
The
rmal
Res
ista
nce
(°C
/W)
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3 Updated format and thermal resistance specifications of Table 4.
Reformatted Tables 9, 10, 11, and 12.
Added dimensions A3, D1, and E1 to Figures 18, 19, and 20.
Revised Section 1.8.7 and Figure 25, removed Figure 26 and Table 19 (information now included inFigure 25).
Reformatted Section 1.10.
Clarified address bus and address attribute pull-up recommendations in Section 1.8.7.
Clarified Table 2.
Updated voltage sequencing requirements in Table 1 and removed Section 1.8.3.
4 Added 450 MHz speed bin.
Changed Table 16 to show 450 MHz part in example.
Added row for 433 and 450 MHz core frequencies to Table 17.
In Section 1.8.8, revised the heat sink vendor list.
In Section 1.8.8.2, revised the interface vendor list.
5 Added Note 6 to Table 10; clarification only as this information is already documented in the MPC750RISC Microprocessor Family User’s Manual.
Revised Figure 24 and Section 1.8.7.
Corrected Process Identifier for 450 MHz part in Table 20.
Added XPC755BRXnnnTx series to Table 21.
6 Removed 450 MHz speed grade throughout document. These devices are no longer supported for newdesigns; see Section 1.10.2 for more information.
Relaxed voltage sequencing requirements in Notes 3 and 4 of Table 1.
Corrected Note 2 of Table 7.
Changed processor descriptor from ‘B’ to ‘C’ for 400 MHz devices and increased power specificationsfor full-power mode in Table 7. XPC755Bxx400LE devices are no longer produced and are documentedin a separate part number specification; see Section 1.10.2 for more information.
Increased power specifications for sleep mode for all speed grades in Table 7.
Removed ‘Sleep Mode (PLL and DLL Disabled)—Typical’ specification from Table 7; this is no longertested or characterized.
Added Note 4 to Table 7.
Revised L2 clock duty cycle specification in Table 11 and changed Note 7.
Corrected Note 3 in Table 20.
Replaced Table 21 and added Tables 22 and 23.
Table 19. Document Revision History (continued)
Rev. No. Substantive Change(s)
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1.10 Ordering InformationOrdering information for the devices fully covered by this specification document is provided inSection 1.10.1, “Part Numbers Fully Addressed by This Document.” Note that the individual part numberscorrespond to a maximum processor core frequency. For available frequencies, contact your local Motorolasales office. In addition to the processor frequency, the part numbering scheme also includes an applicationmodifier which may specify special application conditions. Each part number also contains a revision codewhich refers to the die mask revision number. Section 1.10.2, “Part Numbers Not Fully Addressed by ThisDocument,” lists the part numbers which do not fully conform to the specifications of this document. Thesespecial part numbers require an additional document called a part number specification.
1.10.1 Part Numbers Fully Addressed by This DocumentTable 20 provides the Motorola part numbering nomenclature for the MPC755 and MPC745 devices fullyaddressed by this document.
Table 20. Part Numbering Nomenclature
XPC xxx x xx nnn x x
ProductCode
PartIdentifier
ProcessDescriptor
Package 1 ProcessorFrequency
ApplicationModifier
Revision Level
XPC 2 755745
B = HiP4DP PX = PBGARX = CBGA
300350
L: 2.0 V ± 100 mV0° to 105°C
E: 2.8; PVR = 0008 3203
755 C = HiP4DP 400
Notes:1. See Section 1.7, “Package Description,” for more information on available package types.2. The X prefix in a Motorola part number designates a “Pilot Production Prototype” as defined by Motorola SOP
3-13. These are from a limited production volume of prototypes manufactured, tested, and Q.A. inspected ona qualified technology to simulate normal production. These parts have only preliminary reliability andcharacterization data. Before pilot production prototypes may be shipped, written authorization from thecustomer must be on file in the applicable sales office acknowledging the qualification status and the fact thatproduct changes may still occur while shipping pilot production prototypes
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1.10.2 Part Numbers Not Fully Addressed by This DocumentDevices not fully addressed in this specification document are described in separate part numberspecifications which supplement and supersede this document, as described in the following tables.
Table 21. Part Numbers Addressed by XPC755B xxnnn Tx Series Part Number Specification(Document Order No. MPC755BTXPNS/D)
XPC 755 B xx nnn T x
ProductCode
PartIdentifier
ProcessDescriptor
PackageProcessorFrequency
ApplicationModifier
Revision Level
XPC 755 B = HiP4DP RX = CBGA 350400
T: 2.0 V ± 100 mV–40° to 105°C
D: 2.7; PVR = 0008 3203E: 2.8; PVR = 0008 3203
Table 22. Part Numbers Addressed by XPC755B xxnnn LD Series Part Number Specification(Document Order No. MPC755BLDPNS/D)
XPC xxx B xx nnn L D
ProductCode
PartIdentifier
ProcessDescriptor
PackageProcessorFrequency
ApplicationModifier
Revision Level
XPC 755745
B = HiP4DP PX = PBGARX = CBGA
300350400
L: 2.0 V ± 100 mV0° to 105°C
D: 2.7; PVR = 0008 3203
Table 23. Part Numbers Addressed by XPC755 xxxnnn LE Series Part Number Specification(Document Order No. MPC755BLEPNS/D)
XPC 755 x xx nnn L E
ProductCode
PartIdentifier
ProcessDescriptor
PackageProcessorFrequency
ApplicationModifier
Revision Level
XPC 755 B = HiP4DP RX = CBGA 400 L: 2.0 V ± 100 mV0° to 105°C
E: 2.7; PVR = 0008 3203
PX = PBGA
C = HiP4DP RX = CBGA 450
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1.10.3 Part MarkingParts are marked as the example shown in Figure 29.
Figure 29. Part Marking for BGA Device
BGA
XPC755CRX400LE
MMMMMMATWLYYWWA
755
BGA
XPC745BRX350LE
MMMMMMATWLYYWWA
745
Notes :
CCCCC is the country of assembly. This space is left blank if parts are assembled in the United States.
MMMMMM is the 6-digit mask number.ATWLYYWWA is the traceability code.
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nc
...
MPC755EC/D
HOW TO REACH US:
USA/EUROPE/LOCATIONS NOT LISTED:
Motorola Literature DistributionP.O. Box 5405, Denver, Colorado 802171-303-675-2140 or(800) 441-2447
JAPAN:
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TECHNICAL INFORMATION CENTER:
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HOME PAGE:
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Information in this document is provided solely to enable system and software implementers to use
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