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Altera_Forum
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11 years ago

AS Configuration Problem with EP3C25E144

Hello ! i have designed circuit in EP3C25E144 TQFP FPGA. I am using both configuration scheme i.e JTAG and AS for EPCS64. Using the same connection schemes as mentioned in Altera Cyclon III c...
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Altera_Forum
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11 years ago

Good, I'm glad it's working. Yes, you can do away with the AS programming header. I haven't bothered putting an AS header on a board for a long time.

JTAG will always work, regardless of the setting on the MSEL pins - in a sense they are bypassed. However, for the FPGA to boot from the EPCS the MSEL pins must be correctly set for AS mode.

As to why your AS programming header doesn't work - I can only presume a design or build fault. The FPGA & EPCS are clearly connected up correctly.

Cheers,

Alex