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Altera_Forum's avatar
Altera_Forum
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16 years ago

NIOS SOPC Flash Memory Interface (CFI)

I am trying to read the Query values from a CFI compliant flash device, a PC28F128P30b85. I have implemented a NIOS SOPC solution with a tri-state bridge module and cfi-flash module. The cfi-...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

one common mistake is to setup the cfi for 16 bit mode but connect it as 8 bit device.

when you have a 16 bit device, then you have no address bit 0 as the would always be 0 indicating even address access.

so check wheter you have connected nios a1 to flash a0.

some flash device have adressbit [-1] that is used in 8 bit mode and is a databit in 16bit mode