What is Timing between nCEO and DCLK in a multi-device AS Configuration ?

Thanks Jim. I will certainly have a look at the document you referenced.

I might be able to help with your problem, if I am understanding it correctly.

You have one Cyc III being programmed AS from an EPCS device, and you do not

see the nCS line transition, yes? I would not expect the nCS line to transition I

would have it pulled to GND through a 10K Ohm resistor. Some diagrams show it

tied directly to GND, but I see the pull down resistor in the diagrams explaining

the arrangement that uses a 10 pin programming cable to program the EPCS.

http://www.altera.com/literature/hb/cyc3/cyc3_ciii51016.pdf

Excuse me if I am misunderstanding your issue.

I have had some mystery with when I program the EPCS with my programming cable

as to whether I need to remove the programming cable to allow the FPGA configuration

to start. Sometimes I can leave it in. Sometimes I have to disconnect it (?).