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EugenyB's avatar
EugenyB
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

Performing user access to the configuration serial flash device

Cyclone III. I need access to the serial flash device (W25Q128) after configuration completes. I am unable to select pins connected to the flash chip using my "user" code. Whatever I set in the dev...
EugenyB's avatar
EugenyB
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

>It can be used as user I/O after configuration.

Do I understand it properly - if I use AS configuration mode, the ASDO pin will only be an output in user mode? Or can I configure it do be bi-directional?

EugenyB's avatar
EugenyB
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

Some progress here. I was able to allocate 4 serial flash pins in the design, and project compiled without problems, declaring DI/DO as input/output pins. So now testing stage.

I was doing the stupid mistake - trying to allocate these 4 pins of serial flash without removing cycloneii_asmiblock from the design, and this cycloneii_asmiblock was hijacking programming pins before high level module and of course the module was failing to see these pins as available for the design.