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Altera_Forum
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12 years ago

Configuring 2 Cyclone III's from one EPCS16 Using 2.5V

Hello, My FPGA configuration signals an error by pulling the nStatus line down at the end of configuration and starting over (and over and over). 1. I am attempting to configure two EP3C4...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

I cannot program the two FPGA's separately since I cannot decouple the Config_Done's. However, if I repeatedly trigger

off of nCEO and monitor Config_Done at 10 mV per division and lots of averaging I can tell that the first FPGA must have

released its Config_Done right at the time that nCEO goes active (low). Config_Done shows ringing and a 3 mV change in

its level.

This looks like evidence that it is the second FPGA that is failing its configuration, yes ??