MAX7000s clock?

Discussion in 'General Electronics Chat' started by Konstabel, Feb 2, 2008.

  1. Konstabel

    Thread Starter Active Member

    Jan 31, 2008
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    Is it an absolute must to have a clock on the cpld? The code I am planning to implement is basically to give me extra I/O ports on my uP. I would like to drive 8 7-segment displays from my cpld, my uP would not be able to handle that amount of I/O pins.
     
  2. mrmeval

    Distinguished Member

    Jun 30, 2006
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  3. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
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    That's a really good question! I am not sure, but I believe you do not require a clock. Perhaps, during configuration, if you are in a programming mode that requires the CPLD to source a clock, then obviously you will need them. Usually PROMs are master-serial/parallel devices.

    Steve
     
  4. nanovate

    Distinguished Member

    May 7, 2007
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    If it is all combinatorial logic then you probably do not need one.
     
  5. SgtWookie

    Expert

    Jul 17, 2007
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  6. electronictech

    Active Member

    Apr 1, 2009
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    You do not need a clock.

    Modern CPLD's have flash configuration memory, so once you download the design, the CPLD will operate as programmed as soon as power is applied.

    CPLD's are assignable logic devices, you can embed just about any logic design into it, and assign pins to specific points.........basically you can build the PCB first, then program the device to work with it.
     
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