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Altera_Forum
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14 years ago

about the CONF_DONE in the PS configuration

Dear all, I am trying to configure the Cyclone III device using the Passive Serial mode. In the very beginning, I draw the nCONFIG low, and subsequently the Cyclone III draw the nSTATUS low....the qu...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

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Probe setup as little endian

0xfe50_0020 f7f7f76a f3f3f3f7 fbfaf3fb f9f9f1fa

Probe setup for big endian

0xfe50_0020 6af7f7f7 f7f3f3f3 fbf3fafb faf1f9f9

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In both cases the bytes are; 6a f7 f7 f7 f7 f3 f3 f3 ... which matches your .rbf.

This at least confirms your bytes in flash appear to be correct. How are you PS programming? Using an SPI controller? Check the bit-ordering with a scope.

This document may give you some hints too ...

http://www.ovro.caltech.edu/~dwh/carma_board/fpga_configuration.pdf

Check the different control signal pulses match their expected timing.

Cheers,

Dave