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Altera_Forum
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13 years ago

cyclone III configuration chain problem

Hi, I have two EP3C25Q240 cyclone III fpgas on my board with the EPCS16 configuration device. The system is set up for multi device AS configuration as per figure 9-4 in the cyclone device ha...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Hi Gary,

Have you tried configuring both devices using JTAG?

Try configuring them both as a two device chain (nCEO->nCE, etc), and if that fails, try configuring them individually.

Perhaps that may provide some insight as to your issue. For example, if both can be configured via JTAG, you know the issue is definitely related to your AS/PS setup. If you cannot get the second device to configure at all, then your problem might not be your configuration logic, but the power supplies on the second FPGA.

Cheers,

Dave