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NetBSD 6.1.5 - man page for njata (netbsd section 4)

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NJATA(4)			   BSD Kernel Interfaces Manual 			 NJATA(4)

     njata -- Workbit NinjaATA-32 CardBus IDE controller driver

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

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

	   NinjaATA-32Bi  CardBus / PCMCIA dual mode IDE controller (``DuoATA'').  This con-
			  troller 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.

     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 val-
     ues).  Smaller wait values should be faster.  Too long waits may cause transfer errors.

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

     The njata device driver first appeared in NetBSD 4.0.

     ITOH Yasufumi

BSD					September 7, 2006				      BSD
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