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Altera_Forum's avatar
Altera_Forum
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17 years ago

Flash memory to configure the Cyclone III

Hi,

I am trying to use a standard flash to configure a CIII chip which is supported in the datasheet. I was wondering if anybody knows the difference between top parameter and bottom parameter flash devices.

I decided to use a 256 MB Numonyx/Intel chip PC28F256P30T85 for my design becuase its similar to what used in dev kit. No luck though as this chip is not stocked atm. So I look around and see PC28F256P33B85 available. The difference is this is a B is a bottom parameter chip.

I dont really understand the difference between top and bottom parameters. The Altera datasheet does not really get into this kind of specific detail expect to state that I should use P30/P33 > 40Mhz.

However, Anybody know if its okay to use bottom parameter flash part for CIII configration?

Thanks for any help.

2 Replies

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

    Bah. I had an old handbook and didn't realize a new one was out. The new handbook has a section which shows how the Cyclone III skips the starting addresses ignoring the top bottom parameter issue. So its ok to use either top or bottom parameter flash chips.

    • Subhani1's avatar
      Subhani1
      Icon for New Contributor rankNew Contributor
      5 years ago

      the above you mentioned part is also obsolete plz provide any alternate part which support ap configuration.