Post on 18-Dec-2015
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Configuration Schemes Overview
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n Active configuration schemes - Target FPGA generates control & synchronous signals
n Passive configuration schemes - External host controls the configuration process
FPGA
External
Memory
Initiates configuration process
Provides configuration data
Configuration
Controller
Initiates configuration process
and provides configuration data
FPGA
Configuration
Device
Configuration
Controller
Memory
Active Configuration Schemes
n Active serial (AS): - Configuration data gets loaded one bit at the time.
- Supported memory device: serial configuration (EPCS) device.
n Active parallel (AP): - Configuration data gets loaded 16 bits at a time.
- Supported memory device: 16 bit parallel flash memory
- Applicable to Cyclone III and Cyclone IV devices only.
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FPGA
External
Memory
Initiates configuration process
Provides configuration data
Configuration
Controller
Passive Configuration Schemes
n Passive Serial (PS): - Configuration data gets loaded one bit at a
time
n Passive parallel schemes: - Configuration data gets loaded 8 bits at a time
- Supported schemes:
l Fast passive parallel (FPP)
l Passive parallel synchronous (PPS)
l Passive parallel asynchronous (PPA)
n JTAG Configuration: - Developed by Joint Test Action Group as a
specification for boundary-scan testing
- Standardized as IEEE Std. 1149.1
- Test pin connections and functionality without using physical probes
- Forced test data is serially shifted into boundary-scan cells
- Captured data is serially shifted out
- Captured data is compared with the expected results
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FPGA
EPC Device
Configuration
Controller
Memory
FPGA
MAX II or
External Processor
Configuration
Controller
External Flash
Memory
FPGA
Configuration Schemes Comparison
Active or passive
configuration scheme
Configuration
scheme
Serial or parallel
configuration
External memory and/or
configuration device
Width of
configuration
data
Relative
configuration
time
Active AS Serial EPCS device 1 Moderate
AP Parallel Supported common flash interface
(CFI) parallel flash memory
16 Fast
Passive PS Serial MAX II, MAX3000A/7000, or
microprocessor with flash memory
1 Moderate
Serial EPC device 1 Moderate
Serial Download cable 1 Moderate
FPP Parallel MAX II, MAX3000A/7000, or
microprocessor with flash memory
8 Fast
Parallel EPC device 8 Fast
PPA Parallel MAX II, MAX3000A/7000, or
microprocessor with flash memory
8 Moderate
JTAG Serial MAX II, MAX3000A/7000, or
microprocessor with flash memory
1 Slow
Serial Download cable 1 Slow
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