Hi guys
I have two spartan 3e's and a coolrunner in a single JTAG chain.
If I program either FPGA from power up its outputs do not drive, but I can read the JTAG user register and it has the value that I set from "generate programming file" so the binary is in the FPGA but the IO doesn't get driven, presumably the "enable outputs" state in the startup sequence never occurs.
When I program the other FPGA it works correctly, but the first still does not drive.
I then reprogram the first FPGA and it now works correctly as well.
prog_b is driven high throughout the above. The two done's are connected together and pulled up to 2v5. the init_b's are connected together and pulled up to 3v3 (the bank IO voltage)
I haven't seen any activity on the done or init_b signals.
Could someone please point me to which signal from the unprogrammed fpga stops the first FPGA from driving out forever.
thanks and regards
Katherine