16-bit PC Card (PCMCIA)

Discussion in 'IBM' started by Edward L. Hepler, Sep 23, 2005.

  1. I have a prototype board that I am trying to interface to a laptop
    (running Windows XP) via a 16-bit PCMCIA interface. The maximum
    data rate that I can get on simple read/writes is about 500 Kbytes/sec
    through the generic PCMCIA driver. The prototype circuit looks like
    memory through the PCMCIA interface.

    pcmcia.org says that a 16-bit PCMCIA card interface has a maximum
    throughput of almost 8 Mbytes/sec... I know that I can't achieve
    the theoretical maximum, but I was expecting to get more than 6 or 7%
    of the maximum...

    Does anyone have a simple example of how to set up the driver on
    the Windows side to maximize the throughput (reads/writes) in 16-bit
    mode?

    Code examples would be great... You help is apprecitated...

    Ed

    Please respond to:
    Edward L. Hepler, Sep 23, 2005
    #1
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  2. Edward L. Hepler

    Some Guy Guest

    "Edward L. Hepler" wrote:

    > 16-bit PCMCIA interface.


    You'll have to use DMA to get really high speeds. Something like a
    bus-mastering DMA controller chip.

    For ISA and PCI slots, DMA data transfer is possible, but I don't know
    if DMA functionality is extended to the PCMCIA slot.
    Some Guy, Sep 24, 2005
    #2
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