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ASIC with RAM

Discussion in 'Electronic Design' started by padmow, Mar 3, 2005.

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  1. padmow

    padmow Guest

    Greetings,

    I wonder if anyone can help. I need ASIC chip which contain at least
    64KB of RAM, keyboard interface.

    Any estimates of how much it is also appreciated

    thank you in advance
    Padmow
     
  2. Ian Stirling

    Ian Stirling Guest

    Why?
    Do you mean an actual ASIC, which would typically be in volumes of
    millions, completely custom, or would something generic work?
     
  3. Fred Bloggs

    Fred Bloggs Guest

    That would be something like this:
    http://www.dolphin.fr/flip/ragtime/035/ragtime_035_products.html
    -although you most likely don't know what you're asking.
     
  4. Luhan Monat

    Luhan Monat Guest

    I think this guy is looking for a single board computer or development
    system.

    Nomination: This months "What the heck is this about?" award.
     
  5. padmow

    padmow Guest

    I think, it should be completely custom.

    I imagine the chip should contain:

    64KB SRAM

    keyboard interface which can buffer 128 character from IBM PC keyboard
    in the SRAM

    I/O to 8bit CPU

    8bit I/O to obtain data directly from certain address in SRAM


    is it possible to have 64KB of SRAM in ASIC, I'm not sure about that.

    anyway thanks in advance
    Padmow
     
  6. Luhan Monat

    Luhan Monat Guest

    Nice on such details, but you have not said what it is supposed to do.
     
  7. Nico Coesel

    Nico Coesel Guest

    Why create an ASIC? The PC keyboard signals are easely handled by a
    microcontroller or a DSP. You can still get a single chip solution.
     
  8. padmow

    padmow Guest

    DSP solution is interesting, how much RAM can we get.
     
  9. padmow

    padmow Guest

    this is connected to a microprocessor. so we can have 2 chip solution.
     
  10. Rich Grise

    Rich Grise Guest

    I wish you would learn to include some context. Here's what you said that
    your spec. is:
    ----------------
    I think, it should be completely custom.
    I imagine the chip should contain:
    64KB SRAM
    keyboard interface which can buffer 128 character from IBM PC keyboard
    in the SRAM
    I/O to 8bit CPU
    8bit I/O to obtain data directly from certain address in SRAM
    is it possible to have 64KB of SRAM in ASIC, I'm not sure about that.
    ------------------

    So you want a two-chip solution, and you seem convinced that the only
    way to achieve
    + "keyboard interface w/128K buffer" (which you don't say
    is supposed to be within that 64K or not)
    + 8 bits of I/O
    + Interface to the RAM

    is with some nebulous "ASIC".

    What's preventing you from just getting a 64K RAM chip, and a micro
    that has enough pins to just address it and do your I/O and buffering?

    Thanks,
    Rich
     
  11. Nico Coesel

    Nico Coesel Guest

    There are DSPs with 256kB. The problem is finding one in a small
    package with flash and the amount of RAM you want. I recommend looking
    at Texas Intruments and Analog Devices. How much speed do you think
    you need?
     
  12. padmow

    padmow Guest

    when the external Microprocessor accessing the RAM, I would prefer it
    is done by pure hardware. faster and simpler I think

    Padmow
     
  13. Ian Stirling

    Ian Stirling Guest

    Cheaper, if you're building a hundred thousand.
    Not faster, unless you need 100s of MB/second maybe simpler.
    Otherwise, it's going to be cheaper to either go discrete, or to pick a
    general purpose micro that's got enough internal RAM.
     
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