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Jcole's avatar
Jcole
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2 years ago
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Generic Serial Flash Interface addressing only generating 22 bit addressing for 24 bit flash

New to using some of the Avalon based cores. I generated a 128MB Generic Serial Flash Interface core for my EPCQ128A Flash, the addressing is only Avalon memory is section is 22 bits, but how do I se...
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  • FvM's avatar
    FvM
    2 years ago

    128 MBit Flash uses 24-bit-wide byte address. AVMM interface has however 22 DW addresses + 4 byte-enable lines to access the flash. A doubleword access at AVMM is translated by GSFI core to 4 consecutive internal byte accesses.