FLEX 10K Embedded Programmable Logic Family Data Sheet
Table 13. FLEX 10K JTAG Instructions
JTAG Instruction
Description
SAMPLE/PRELOAD Allows a snapshot of signals at the device pins to be captured and examined during
normal device operation, and permits an initial data pattern output at the device pins.
EXTEST
Allows the external circuitry and board-level interconnections to be tested by forcing a
test pattern at the output pins and capturing test results at the input pins.
BYPASS
Places the 1-bit bypass register between the TDIand TDOpins, which allows the BST
data to pass synchronously through a selected device to adjacent devices during normal
device operation.
USERCODE
IDCODE
Selects the user electronic signature (USERCODE) register and places it between the
TDIand TDOpins, allowing the USERCODE to be serially shifted out of TDO.
Selects the IDCODE register and places it between TDIand TDO, allowing the IDCODE
to be serially shifted out of TDO.
ICR Instructions
These instructions are used when configuring a FLEX 10K device via JTAG ports with a
BitBlaster, ByteBlaster, or ByteBlasterMV download cable, or using a Jam File (.jam) or
Jam Byte-Code File (.jbc) via an embedded processor.
The instruction register length of FLEX 10K devices is 10 bits. The
USERCODE register length in FLEX 10K devices is 32 bits; 7 bits are
determined by the user, and 25 bits are predetermined. Tables 14 and 15
show the boundary-scan register length and device IDCODE information
for FLEX 10K devices.
Table 14. FLEX 10K Boundary-Scan Register Length
Device
Boundary-Scan
Register Length
EPF10K10, EPF10K10A
EPF10K20
480
624
EPF10K30, EPF10K30A
EPF10K40
768
864
EPF10K50, EPF10K50V
EPF10K70
960
1,104
1,248
1,440
1,440
EPF10K100, EPF10K100A
EPF10K130V
EPF10K250A
40
Altera Corporation
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