working with a custom board with a V4 on it. It has been working fine for a couple of months until last week - when the FPGA would just not come out of reset. I tried running a JTAG boundary scan using Impact, and got the following error:
"ERROR:iMPACT:585 - A problem may exist in the hardware configuration. Check that the cable, scan chain, and power connections are intact, that the specified scan chain configuration matches the actual hardware, and that the power supply is adequate and delivering the correct voltage. Chain TCK freq = 100000000. Chain TCK freq = 100000000. Validating chain... Boundary-scan chain validated successfully."
now it does say 'boundary-scan chain validated successfully', so whats going on here? I probed the prog_b signal on the V4 and it never goes high. There is an external pull-up on it per spec. Any ideas why the prog_b would be held low?
any help is much appreciated.
-Thanks!