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What's One-Wait-State On-Chip ROM mean in TI?

Discussion in 'Electronic Basics' started by Davy, Sep 27, 2005.

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  1. Davy

    Davy Guest

    Hello all,

    I am reading TI's datasheet. And What's One-Wait-State On-Chip ROM
    mean? Can it be reprogrammable like Flash?

    Any suggestions will be appreciated!
    Best regards,
    Davy
     
  2. James Beck

    James Beck Guest

    From that little bit of information I couldn't tell you.
    One Wait State ROM means the CPU/CORE has to wait one bus cycle when
    accessing the ROM because it (the ROM) is slower than the CPU is. ROM
    is a pretty generic term these days and if it is REALLY ROM then once it
    is programmed/masked it is over. Now EEPROM, EPROM, FLASH can be erased
    and used again. I'm sure the datasheet has all of the information you
    need. You just need to read it completely.

    Jim
     
  3. Tim Wescott

    Tim Wescott Guest

    Telling us which of the gazzilion TI processors you're talking about
    would be helpful. Usually if they mean flash they say "flash", though.
     
  4. Jerry Avins

    Jerry Avins Guest

    Some memories are faster than others. When the memory is slower than the
    processor's cycle time, the processor must wait one or more clock cycles
    for data from it after the address has been asserted. Each such cycle is
    called a wait state.

    ROM = read-only memory. Read-only means no writes.

    Jerry
     
  5. Davy

    Davy Guest

    Hi all,

    Thank you for your help :)

    I mean the 320VC55x series(320VC5509).
    Can I program the ROM or let TI do that? And if TI do that, how about
    the cost?

    Any suggestions will be appreciated!

    Best regards,
    Davy
     
  6. Jasen Betts

    Jasen Betts Guest

    ["Followup-To:" header set to sci.electronics.basics.]
    one wait state means it's half as fast as the cpu, if it was user
    programmable they'd probably call it PROM,EPROM,FLASH or EEPROM.

    Bye.
    Jasen
     
  7. No, as Jerry Avins said, it means that there is an extra cycle (wait state)
    between the address and read portion of the access cycle.
     
  8. Davy

    Davy Guest

    Hi Jasen,

    Thank you :)

    I have one more question. If I have no on-chip Flash on TI's DSP, how
    to protect my code? For everyone can copy my code from Flash and
    produce another product?

    All the best,
    Davy
     
  9. Jasen Betts

    Jasen Betts Guest

    yes they can.

    one option is to set the circuit in resin to make it hard to access the flash
    another is to use a DSP with built in read-protectable PROM etc. if you
    intend to produce large quuantities (eg ten thousand) TI can make them
    already programmed (so called mask ROM)

    Bye.
    Jasen
     
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