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baumann1
Visitor II
August 22, 2005
Question

Memory Map Problem

  • August 22, 2005
  • 2 replies
  • 727 views
Posted on August 22, 2005 at 11:02

Memory Map Problem

    This topic has been closed for replies.

    2 replies

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    baumann1Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 12:08

    Hi,

    we used to use the PSD813 as program space and and EPROM in a socket as removable update-device.

    Everything worked perfect. - It´s an 8051-arcitecture.

    Now we use additionally for the first time the SRAM mapped in data space. During the update sequence we read from the EPROM, but now I will have to block or mask out the SRAM space.

    Is it possible to do that by changing the PSD-registers?

    Or what to do else??

    please help!

    Linus

    J
    jdaniel
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 12:08

    Take a look at the definition of the ''VM'' register in the PSD data sheet. It controls what pins generate chip-selects for what pieces of internal PSD memory. You can use that to stop RD from accessing the SRAM.

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