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RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
• Status report on RPC FEB production• Status report on RPC Distribution Board• Interfaces RPC-LB
RPC electronics statusRPC electronics status
Flavio Loddo
I.N.F.N. Bari
RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
Barrel FEB Production Barrel FEB Production statusstatus
• All the Barrel FEBs produced and tested (5500)
• The Boards classified according to the delay time in steps of 250 ps
--> Time code produced
• Boards with the same time code are mounted on the 6-FEB rows
• Test & classification results logged into Barrel RPC production Database (www.ba.infn.it/rpc)
RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
Barrel FEB Production Barrel FEB Production statusstatus
16 inputs from strips
RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
Barrel FEB DatabaseBarrel FEB Database
RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
EndcapEndcap FEB Production status FEB Production status (PK (PK responsability)responsability)
• 50 Endcap FEBs produced and used during 2002 Test Beams• Mechanical problems (poor locking) on the input connector
other connectors under evaluation
32 inputs from strips
MLink Board
SLink Board
DistributionBoard
Backup I2C busfrom DT (for 2 RPC’s)
FEB
FEB
RPC
LV1
LV2
LV3
MUX
(I2C from LB)
(Backup I2C)
I2C (LVDS)
LV input cable
Signals + test pattern cable
I2C connector
LV input
FieldbusOPTO
BarrelBarrel Distribution Board Distribution Board
Full production: done (450 boards)
RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
BarrelBarrel Distribution Board Distribution Board
Power Connector
I2C Conn.
(Sec. 1-2,DT)
I2C Conn.
(Sec. 3)To FEB row # 3
To FEB row # 1
To FEB row # 2
Dim: 13 x 21 cm2
(including connectors)
RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
EndcapEndcap Distribution Board Distribution Board (PK (PK responsability)responsability)
Power ConnectorI2C Conn.
To FEB row # 1
To FEB row # 2
(to be used only in RE2/1)
Dim: 7.8 x 5.9 cm2
Power: ~ 100 mW
RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
Interfaces RPC-LBInterfaces RPC-LB
RPC-LB interfaces
FEB-LB
1. FEB -> LB:
16 LVDS output signals
2. LB -> FEB:
4 LVDS Test Input
(1 per 4 channels)
All available on the same 40-pin Scotchflex connector
Distr.Board – Control Board
(Slow Control)
RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
RPC Distr. Board-LB Control RPC Distr. Board-LB Control BoardBoard
• The Control Board sends remote control to RPC via I2C bus
• One I2C line can control up to 8 Barrel FEB or 4 Endcap FEB
Barrel: 12 (18) FEBs/Chamb.
We need:
• 15 lines in sectors 4,10
• 12 lines in sectors 9,11
• 13 in the other barrel sectors
Endcap: 8 FEBs/RE2/1
3-4 FEBs elsewhere
We need:
• 1 line for each chamber, including RE2/1 where we use I2C Mux to address 2 rows
RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
RPC Distr. Board-LB Control RPC Distr. Board-LB Control BoardBoard
• The I2C bus is a local bus running at 100 kbit/s in standard mode
• It consists of 2 serial lines: SCL (uni-directional) and SDA(bi-directional)
•It cannot drive long lines (few meters max) because it suffers of high capacitive loads
• To overcome this limitation, on the Control Board the SDA line is split into 2 uni-directional lines using the Philips component (P82B96) and SCL, SDA_IN, SDA_OUT are sent to RPC in LVDS on twisted-pair cable
•On the RPC Distr. Board they are reconverted into standard I2C and sent to FEBs
• This link (25 meter cable) was tested successfully during last test beam (I don’t expect problems with longer cables, due the very low transmission rate)
RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
RPC Distr. Board-LB Control RPC Distr. Board-LB Control BoardBoard
• The I2C bus is used to set and read-back the Vthresholds and the Pulse widths on the FEBs
• Typical I2C operations are:
1. Write 1, 2 or 3 bytes
2. Read 1 or 2 bytes
• It could not be tested during 2003 test beam due to limitations in the CCU
RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari
ConclusionsConclusions
• The Barrel electronics was fully produced and is under installation in the detectors
• The Endcap electronics was designed and is ready for production
• During the 2003 Test Beam (25ns beam) were tested successfully:
1. the RPC-LB connection (RPC signals and Test pattern signals)
2. the Control Board-Distr. Board only under the electrical point of view
• More investigations are needed for I2C routines implemented in the Control Board