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Altera only officially supports AS configuration from their own EPCS devices. However, if you can find an SPI flash device that is similar enough to the EPCS parts, they will work.
I just checked very quickly but I have a feeling the 24LC512 would not be a suitable replacement. The 24LC512 supports a max clock of 20MHz which is too slow for the Cyclone III.
One example of a part that I know works well is the Numonyx M25P64. If you search these forums you can find other examples that people have indicated success with.
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I've a third party POF file to download into my cyclone III fpga, I've a M25P64 that I can write with the quartus programmer, the memory, as you told, is recognised as EPCS64. But at the next power on, the DONE doesn't go to logic 1. The nSTATUS toggle between 0 and 1 with a period of 660ms (stay at 0 for about 60us), the nCONFIG signal stay at 1.
What's does it means? There is a configuration error, correct? What can I do?
I've a suspect, the pof file need to be generated by quartus and the M25p64 part number must be provided to quartus in order to generate a correct file?
Sorry for the noob questions but I' new on altera fpga.
Thanks
Honored Contributor
