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Can C6424 HPI use HAS# to latch cntrl lines?

StuJ
Prodigy 210 points
The doc "TMS320C6000 DSP Host Port Interface (HPI) Reference Guide", SPRU578C 2006, p18 talks about HAS# being used to latch HHWIL, HCNTL[1-0], and HR/W in multiplexed mode.  However, ""TMS320C642X DSP Host Port Interface (HPI) User's Guide", SPRUEM9A 2008 doesn't mention this possibility (in fact it suggests tying HAS# high).  
Has support for HAS# been removed from the C642x, or is SPRUEM9A not telling the whole story?
Thanks,
stu

  • 0
    TI__Guru* 84110 points

    Stu,

    Welcome to the TI E2E forum. I hope you will find many good answers here and in the TI.com documents and in the TI Wiki Pages. Be sure to search those for helpful information and to browse for the questions others have asked on similar topics.

    This answer may not be as satisfying as you had hoped for. I do not know to discuss design decisions or product development methods, but I am able to confirm what you already guessed.

    SPRUEM9A is the document to use when designing a system with the C6424. The other documents may describe the use of peripherals on other devices, but for the HPI on the C6424, this is the one to use for your design decisions. If there is anything about what the document says how to use the part that is unclear, we can try to clarify that.

    You can use HDS1# to latch the control signals; HDS2# can be used to set the polarity that you want for the HDCS1# signal, for a rising edge or a falling edge to do the ltaching of the control signals. This may not be the exact same waveforum as the HAS# that you wanted to use, but will it be easy to make it work in your system?

    Regards,
    RandyP

     

    If you need more help, please reply back. If this answers the question, please click  Verify Answer  , below.