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Altera_Forum's avatar
Altera_Forum
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15 years ago

Write Protection issue on EPCS

Hi, I'm using CyclonIII with standard AS configuration scheme with EPCS64.

My project includes writing/reading parameters to/from EPCS Flash memory by NIOS.

How can I protect Configuration Image on EPCS Flash from accidental overwriting?

Thanks.

4 Replies

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

    Could you possibly point me at this topic in the forum? I've not found it.

  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    I think, the protection can be changed in the flash programmer tool, it has been discussed in the forum before.

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

    Thank you for your response.

    Yes, I know about this register but I don't realy want to alter EPCS Controller design in order to access this register.

    Is there another way to config this reg?
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    EPCS flash devices have a block protection feature which helps to prevent unintentional data overwriting. You can select the protected blocks through a 3-bit configuration in status register.

    Refer to the EPCS datasheet, page 16 and following.