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"Could you clarify; did nCEO transition from high-to-low, implying that the first FPGA configured ok, and its the second that causes the failure?"
Sorry, Good catch. nStatus goes low when nCEO goes inactive, low-to-high.
Q4: Would nStatus go low earlier if the first FPGA had detected failure?
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If there was something wrong with the configuration data, then I would expect the first device to "complain" earlier, i.e., drop nSTATUS low.
Do you have JTAG connected on this board? Does it work?
If it does, you could ...
1. Confirm that both devices can be configured using JTAG. Probe nCEO, nSTATUS, and CONF_DONE.
2. Load the EPCS with only the configuration data for the first device.
Pulse nCONFIG, and the EPCS should configure only the first device. That first device should assert nCEO to enable the second device.
2. Use JTAG to load the second device.
I don't see any reason why that should not work - but I'm not sure if its totally valid - try it and see.
Cheers,
Dave
Honored Contributor
