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parallel port on OMAP137

Carl R
Intellectual 310 points
Other Parts Discussed in Thread: OMAP-L138, OMAP-L137

 I'm trying to implement a simple parallel DMA port on an OMAP137/6747.  I simply need to know which pins to use for data and control.  The users guide

  SPRUGJ5B, apparently a generic uPP reference, indicates on page 14 to refer to the device specific manual.

   I've about decided one of the GPIO banks is intended to be dedicated for this purpose.  Correct?

 

      thx   Carl R

  • 0
    TI__Expert 8785 points

    The OMAPL137 does not have a Universal Parallel Port (uPP) interface.  The OMAP-L138 device has it though.

    Are you planning to create a parallel port from scratch using GPIO?

    --Christina

     

  • 0 in reply to clam
    Intellectual 310 points

    thx for the quick response..     my mistake   .. I had been using the 138/137 data sheets interchangeably.

      i thought the only difference was that open source Linux was available for the 138.

      Anyway,I need to use the 137 for environmental reasons.    So I guess I will be using the GPIO,

    I noticed a GPIO bank 0  and GPIO bank 1 interrupt in the table 6-15,EDMA events,  page 81 of sprs377b.

      Not quite sure what bank 0  and bank 1 are,or whether this will be useful in building port from scratch.          thx   Carl

     

     

  • 0 in reply to Carl R
    TI__Expert 8785 points

    The peripheral set is also different between the OMAP-L137 and OMAP-L138. 

    In the OMAP-L137, there are 8 banks of 16 general purpose input/output pins.  Each pin can be configured as input or output, and can be used to build your parallel port.  I would recommend starting with the GPIO user guide, http://focus.ti.com/lit/ug/sprufl8b/sprufl8b.pdf.  It will provide you with more detailed explanation on how to program the GPIO. 

    --Christina

  • 0 in reply to clam
    Intellectual 310 points

      OK thx  I finally figured that if I want EMIF A and B,   the SPI port, and the EMAC terminals,  i'd

      have left some GP4  and a few GP3 pins.

     

       Another question:  is the omap 137 available in a PQFP  or only a BGA?   i have a data sheet which may be obsolete

      that indicates it is avilable in the PQFP            thx

  • 0 in reply to Carl R
    TI__Expert 8785 points

    OMAP-L137 is only available in a BGA package. 

    --Christina

  • 0 in reply to clam
    Intellectual 310 points

    Christina,  I think there's a high temperature version of the OMAP 137 ,the OMAP-137HT in a PQFP.   My next question

    relates to the ESD,ie the electro-static discharge circuits.  I think it may be necessary to have external circuits.  can you get any information on

    what the external circuits are, ie what the designs are?          thx   Carl

  • 0 in reply to Carl R
    TI__Expert 8785 points

    Carl,

    It seems like this topic is not related to your original parallel port question.  It would be a good idea to post this as a new question.  This will help other users in the future if they are searching for information similar to your ESD question.

    Thanks,
    Christina