Hi Ken,
Please find my response below:
[1] can a corrupt memory device cause the FPGA to no longer be recognized by the JTAG interface, is the A10 trying to load the program in the meme device and getting stuck?
No it wont be. As long as the FPGA is able to power on, it can be detected. Failed to configure the FPGA during power on doesn't stop Quartus from recognizing the device.
[2] what can cause an A10 that was recognizable by the JTAG interface, to no longer be recognizable after it is programmed?
It can either be the configuration pin is shorted to VCC or ground on the board or the FPGA cannot be powered on.
[3] could the Terasic version of the USB Blaster cause this problem?
I dont think so, since USB blaster is only used to program the programming file into FPGA. Configuration of FPGA doesnt utilize USB Blaster.
Can you check the configuration pin? Is there any problem on the failure board?
Regards,
YL
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