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F28234 XINTF - sync vs async XREADY mode?

Jelena
Expert 7555 points

Hello Champs,

Is it possible to connect syncronous SRAM to XINTF? My customer is worried about long term support for a Cypress ASRAM part. I read in the XINTF UG about synch. mode for XREADy and was wondering if this somehow means that the part can be connected to a sync memory.

Thanks

Jelena

  • TI__Guru 61235 points

    Jelena,

     XINTF on current C28x devices is only for async. SRAM.  The XREADY signal is for hardware wait-state support.  The sync thing is just the synchronization of the sampling of XREADY with the internal device clock.

    - David

  • in reply to David M. Alter
    Intellectual 255 points

    Hello David and Jelena,

    I read your question and answer and I think you can help me,maybe you saw this problem:

     

    I wrote a program that works with XINTF in the 28335 ezdsp starter kit.

    I  configure XINTF to use SARAM in Zone7 without USEREADY signal.

    I define an array in XZone7.

    I  write in the array order number:"array[i]=i" that i increase  in for loop

    But when  I run and emulate my program,My array don't change correct.

    First index of array is 0 second is 1 ...but in 6 or 7 it change suddenly and the 1th to 4th index is changed.

    I don't know why.

    can you help me.

    thanks.