njata(4) - NetBSD Manual Pages

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NJATA(4)                NetBSD Kernel Interfaces Manual               NJATA(4)


NAME

     njata -- Workbit NinjaATA-32 CardBus IDE controller driver


SYNOPSIS

     njata* at cardbus? function ?
     njata* at cardbus? function ? flags 0x01     # with wait 0x01


DESCRIPTION

     The njata driver provides support for the following Workbit Bus-Master
     CardBus IDE controller chips:

           NinjaATA-32Bi  CardBus / PCMCIA dual mode IDE controller
                          (``DuoATA'').  This controller is mainly used for
                          portable drives.  This driver supports the CardBus
                          mode.

           NPATA-32       CardBus IDE controller.  This controller is widely
                          used for CardBus CompactFlash adapters.

     These controllers are capable of bus-mastering for ATA PIO transfer.  The
     njata driver uses the bus-mastering PIO transfer unless transfer buffer
     is unaligned, and significantly reduces CPU usage for PIO-only ATA
     devices compared with usual PIO transfer.


CONFIGURATION

     The optional flags parameter is the ``wait'' value for ATA transfers.
     Some combinations of host and device may fail without flags parameter or
     flags 0x00.  In this case try adding wait values like flags 0x01 or flags
     0x11 (the wait parameter is composed of two 4bit values).  Smaller wait
     values should be faster.  Too long waits may cause transfer errors.


SEE ALSO

     ata(4), atapi(4), cardbus(4), intro(4), wd(4), wdc(4)


HISTORY

     The njata device driver first appeared in NetBSD 4.0.


AUTHORS

     ITOH Yasufumi

NetBSD 7.1.2                   September 7, 2006                  NetBSD 7.1.2