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iMPACT v13.3 does not permit programming Virtex-6 FPGA eFUSE values in JTAG chains of more than one device. The following message appears in the console and log file:
"WARNING:iMPACT - '2': iMPACT software is unable to program the V6 eFUSE values if there is more than 1 device in the JTAG chain. For more information, consult (Xilinx Answer 42682)."
There is an issue in programming that prevents the key from being programmed properly in this scenario (see additional information provided for the 13.2 case below).
For version 13.2 and earlier, when programming a Virtex-6 FPGA eFuse register in a JTAG chain of more than one device, the 256 AES key programmed into the FPGA does not match the intended value. This failure is captured and noted at program time with a message similar to the following:
'2': Verifying FUSE_KEY register with high margin...
'2': Data to be programmed for FUSE_KEY = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
'2': Actual programmed data read from FUSE_KEY = 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
'2': High Margin Verify Failed.
There are three possible work-arounds for this issue:
This issue is targeted for a fix in 14.5 iMPACT. A scripted fix is available, and can be obtained through Technical Support. For access to this fix, open a WebCase and reference (Xilinx Answer 42682).
Answer Number | Answer Title | Version Found | Version Resolved |
---|---|---|---|
47890 | 14.x iMPACT - Known Issues for the iMPACT 14.x tools | N/A | N/A |
40503 | 13.x iMPACT - Known Issues for the iMPACT 13.x Software | N/A | N/A |
Answer Number | Answer Title | Version Found | Version Resolved |
---|---|---|---|
34565 | Design Advisory Master Answer Record for Virtex-6 FPGA | N/A | N/A |
40503 | 13.x iMPACT - Known Issues for the iMPACT 13.x Software | N/A | N/A |