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Altera_Forum's avatar
Altera_Forum
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10 years ago

Cyclone 3 - configure M9K in 8-bit mode?

Hello, probably question which was asked not once before, but I can not find instant answer.

I have 32KBytes of the RAM configured using M9K blocks, 8 bit data bus width. If I configure it by default, I lose 9th bit off the each address location, which is 32768 bits = 4KBytes. Can I somehow internally to the device configure it to use its RAM array organized x8 bus width?

I gave a thought doing it "externally" in the configuration, but it is too much timing and processing overhead.

Please advise.

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    10 years ago

    No, if you really need to use all the bits you will need to add an external module to map them, but as you say it will probably induce a timing overhead.