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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

i am just using I/O, setting the DATA0 bit then triggering DCLK to latch it. very similar to the source code provided in the Altera application note: AN423: Configuring the MicroBlaster

Passive Serial Software Driver. On my scope the data and clock pulses look good. The clock is latched longer then 7ns as the spec states. I check my NSTATUS line throughout the process and it stays high. In testing I was able to inject errors and see NSTATUS drop low to show an error. Is there a specific way Quartus should be setup to build a PS serial file for loading like this? if email is easier let me know. this is one of the remaining issues we are trying to solve so my client can finalize their next board design.

Thanks,

Jordan