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FFULC's avatar
FFULC
Icon for New Contributor rankNew Contributor
3 years ago

Cannot detect MAX V cpld and Cyclonne 5GX in the same jtag chain

Hi I have a new circuit card design with a Byte Blaster 10 pin header connected via jtag to a MAX 5M40ZE64 and then a Cyclone 5CGXFC5C6. The Quartus programmer cannot detect the chain. When I run...
ak6dn's avatar
ak6dn
Icon for Regular Contributor rankRegular Contributor
3 years ago

Unfortunate. Not a lot of other options.

In the past with issues like this I would send the board out for an XRAY to see if there were any obvious physical anomalies in the chip to board connection.

That can provide useful information, but it is informative only.

At this point I think your fix is to have the part removed, reballed, and reinstalled.

Depending upon the nature of the problem it may or may not fix it.

If the actual PCB fab is bad, or the chip is defective, it still won't work.

But if it was an assembly error it could correct it.