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Altera_Forum's avatar
Altera_Forum
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13 years ago

MAXII UFM SPI timing requirements

Hi everybody,

I'm currently trying to use a MAXII CPLD as flash memory via the UFM Megafunction using SPInterface. Unfortunatly I was unable to find limits for the SCK in the related section of the MAXII Device Handbook.

Maybe anyone can tell me what the maximum frequency for SCK is. At the moment I try at 25MHz but I think that is much to high because it's not even close to working...

Any help is appreciated.

Thanks

2 Replies

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

    I would expect that the maximum clock frequency specification of the generic UFM block applies as well. It's 10 MHz.

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

    I've found the bug in my code. The UFM works even at 25MHz, but I mustn't ulterior overwrite the data from the flash as soon as it's written to the register :oops:.

    Thanks for your help anyway...