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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
14 years ago

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Thanks, Dave. There is said to be a low-to-high transition for the CONF_DONE in the end of the configuration, I just want to know, how does the Cyclone device know the configuration is done ? that is, how does the Cyclone device know the exact time that the configuration file (.hex) is sent out?

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Look at page 4, Figure 1, it shows you the timing parameters.

Look at the logic analyzer trace on p60. It shows CONF_DONE going high right after the last DCLK.

The Cyclone device will do the same thing (if its working properly).

Cheers,

Dave