--- Quote Start ---
Oh yes, it seems that only the DATA[0] can be used as a dual purpose pin in the PS configuration.
If you have a look at the Cyclone III configuration in the handbook, page 9-37, you can see that the Cyclone III on the left continues to see it's DCLK toggling after it has been configured, when the one on the right is receiving its own configuration. So I would guess that it would be ok. It would need to be tested to be sure it's not a problem, though.
--- Quote End ---
I have just tested this and dclk is usable as a io pin in passive serial. You need to set e.g. active serial mode to synthesize this, but the resulting file can be uploaded via passive serial and afterwards both dclk and data[0] defintitely work as user pins.
Honored Contributor
