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Altera_Forum's avatar
Altera_Forum
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14 years ago

EPCS16 write one byte more than once

Hi,

I'm trying to use the EPCS16 as storage memory for few bytes.

The configuration is: Use Mega Function ALTASMI_PARALLEL without NIOS.

I managed to read and write one byte the first time.

When I try to rewrite in the same address the data keep the same.

It is known any single byte write limitation?

I'm using Quartus 11.0.

Best Regards,

Manpsilva

2 Replies

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

    Review the serial flash datasheet: After erasing a 512 kbit sector, you can only change data bits from '1' to '0' when wrring one or multiple bytes with a page program command.

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

    Thanks, that explains a lot!

    But I can't find on the Datasheet I have...

    Best Regards,

    M