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  • DM648 disassemly

    DM648 disassemly

    This question is answered
    lei wang89898
    Posted by lei wang89898
    on Apr 09 2012 05:21 AM
    Prodigy140 points

    In the disassemly window of CCS3.3.82 there are some instructions like ' .fphead       n, l, W, BU, nobr, nosat, 0100101';

    but i could not find the instrction in the file 'TMS320C64x/C64x+ DSP CPU and Instruction Set Reference Guide'.

    what is the meaning of .fphead?

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    • AartiG
      Posted by AartiG
      on Apr 09 2012 11:38 AM
      Verified Answer
      Verified by lei wang89898
      Guru70585 points

      Please see this related thread. The C64x/C64x+ CPU Users Guide should have a similar section to the one referenced in that other thread.


      If a post answers your question please mark it with the "Verify Answer" button

      Search the wikis for common questions: CGT, BIOS,  CCSv3, CCSv4
      Track a known bug with SDOWP. Enter the bug id in the "Find Record ID" box

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    • desouza
      Posted by desouza
      on Apr 09 2012 11:38 AM
      Guru56715 points

      Hi,

      You probably are looking at a memory location that contains data instead of code, therefore the disassembly is trying to decode it using the most probable opcodes. In other words, the disasembled instruction has no useful meaning at this address. 

      The symbol .fphead means the Fetch Packet head (the start of a set of instructions to be decoded by the CPU).

      The reason why this is displayed this way is because the disassembly window does not make any assumptions about the code in memory. 

      Hope this helps,

      Rafael


      If my reply answers your question please click on the green button "Verify Answer".
      Search the wiki or go to useful pages for SDOWP, CGT, BIOS, CCSv3, CCSv4, CCSv5
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