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Altera_Forum
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16 years ago

C2 & C3 AS Mode EPCS without Altera EPCS IP

All Cyclone 1, 2 and 3 designs i have done with EPCS devices for AS configuration used the EPCS controller ip that is provided by the sopc builder with the nios cpu. now i do a design that uses...
Altera_Forum's avatar
Altera_Forum
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16 years ago

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within quartus device options under dual purpose options :

cyclone II devices

ASDO, nCSO only selectable as input tri-stated

but both are output of the fpga to the epcs inputs ADSI, nCS

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With Cyclone III, you can choose "Regular User I/O". For Cyclone II, this is not possible for some reason, but you can use the tornado_epcs_controller_atom (like Nios does). I think, this is undocumented, however. From my experience, you have to wait some micro-seconds, before the configuration-logic releases the EPCS and you can access it.

So maybe ALTASMI_PARALLEL is the better solution (I have never used it).

Thomas