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J
jm
Visitor II
March 11, 2004
Question

Port in tristate mode

  • March 11, 2004
  • 2 replies
  • 616 views
Posted on March 11, 2004 at 06:36

Port in tristate mode

    This topic has been closed for replies.

    2 replies

    J
    jmAuthor
    Visitor II
    March 9, 2004
    Posted on March 09, 2004 at 11:44

    Hi,

    I work on ST10F168 with 6M*16bits external ram.

    This external Ram is used by the microcontroller and a xilinx, so the datas and adress bus are divided by 2 chips.

    I would to know if i can put POL & POH & P1L & P1H & P4 in tristate mode when the xilinx is accessing external Ram. Can i do this manually by software or using HOLD,HLDA,BREQ signals with logic combination?

    I see this signals work automatically but i don't know if it work with another chip. If it can, how does it work?

    Thanks

    Regards,

    Jim
    C
    charles239955_st
    Visitor II
    March 11, 2004
    Posted on March 11, 2004 at 06:36

    Hello,

    The bus arbitration mechanism can work with any other chip.

    See the attached pdf pages extract from the ST10F269 user manual.

    ________________

    Attachments :

    Bus_arbitration.pdf : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I0OP&d=%2Fa%2F0X0000000bYR%2FBMoyXuq2HoGirzkKUMYXrKVqwBlUmDOq2tO0ArYUvkc&asPdf=false
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