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Programming EPC4 flash devices

Discussion in 'Electronic Design' started by Jeroen Belleman, Mar 3, 2009.

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  1. There's a bit of a stir around here about problems trying to
    program EPC4 flash memory devices over JTAG. Apparently,
    these things have either Sharp (A-suffix) or Intel (C-suffix)
    chips inside, and the latter refuse to be programmed.

    Oddly enough, EPC16 devices of either origin program just fine.

    Anyone here knows more?

    Jeroen Belleman
  2. Ben Jackson

    Ben Jackson Guest

    I used STMicro M25P40, which is much cheaper than EPC4. I assumed it
    was rebadged as an EPC4 by Altera. There are some pins that the EPC4
    datasheet calls "gnd" which really have functions if you look at the
    M25P40 datasheet.

    Also, by "over JTAG" do you mean with the SFL? Because a direct
    programmer connection would be to a "config" header which is on the
    serial bus, not the JTAG.
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