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PCIWDC(4)		    BSD Programmer's Manual		     PCIWDC(4)

NAME
     pciwdc - DMA Adapter for PCI ATA (IDE) and ATAPI Devices

SYNOPSIS
     pciwdc0 at pci?
     pciwdc* at pci?

DESCRIPTION
     The pciwdc driver provides bus-master or Ultra DMA support for ATA (IDE)
     disks and ATAPI devices such as CD-ROMs attached to a PCI-based mainboard
     or a PCI adapter card.  It is configured as a parent device for the disk
     controller, wdc(4).  If configured with a port of -1, the driver is dis-
     abled, allowing attached devices to be located without DMA support.

     The pciwdc devices may be located at the standard primary and secondary
     disk port addresses, 0x1f0 and 0x170 respectively, in which case they
     normally use the standard primary or secondary disk interrupt lines.
     Other devices are assigned standard PCI interrupts, normally sharing a
     single interrupt for primary and secondary devices if both are present.
     However, interrupt sharing is not yet supported by the driver.

     The supported DMA rates depend on the controller chipset, which is re-
     ported in the autoconfiguration output when booting.  The highest rate
     supported by the device and controller is used.  The following con-
     trollers and chips are supported, with their maximum speeds:

     Acerlabs Aladdin		    Ultra DMA 33 (UDMA2), 33 MB/sec
     AMD 756			    Ultra DMA 66 (UDMA4), 66 MB/sec
     CMD 646			    DMA 2 (WDMA2), 16 MB/sec
     CMD 648			    Ultra DMA 66 (UDMA4), 66 MB/sec
     CMD 649			    Ultra DMA 100 (UDMA5), 100 MB/sec
     HighPoint HPT366		    Ultra DMA 66 (UDMA4), 66 MB/sec
     HighPoint HPT370		    Ultra DMA 100 (UDMA5), 100 MB/sec
     Intel PIIX			    DMA 2 (WDMA2), 16 MB/sec
     Intel PIIX3		    DMA 2 (WDMA2), 16 MB/sec
     Intel PIIX4		    Ultra DMA 33 (UDMA2), 33 MB/sec
     Intel ICH0			    Ultra DMA 33 (UDMA2), 33 MB/sec
     Intel ICH			    Ultra DMA 66 (UDMA4), 66 MB/sec
     Intel ICH2			    Ultra DMA 100 (UDMA5), 100 MB/sec
     Promise Ultra/Fasttrak-33	    Ultra DMA 33 (UDMA2), 33 MB/sec
     Promise Ultra/Fasttrak-66	    Ultra DMA 66 (UDMA4), 66 MB/sec
     Promise Ultra/Fasttrak-100	    Ultra DMA 100 (UDMA5), 100 MB/sec
     ServerWorks ROSB4		    Ultra DMA 33 (UDMA2), 33 MB/sec
     SiS 5591			    Ultra DMA 33 (UDMA2), 33 MB/sec
     Cyrix 5530			    Ultra DMA 33 (UDMA2), 33 MB/sec
     VIA 82C586			    Ultra DMA 33 (UDMA2), 33 MB/sec
     VIA 82C686a		    Ultra DMA 66 (UDMA4), 66 MB/sec
     VIA 82C686b		    Ultra DMA 100 (UDMA5), 100 MB/sec

NOTES
     Note that in order to use UDMA4 mode, 66 MB/sec, and higher, the drive
     must use a special 80 conductor cable.  The driver tries to determine if
     such a cable is attached before setting UDMA4 mode.

     The use of UDMA4 (66MHz) and higher together with non-UDMA4 devices on
     the same ATA channel is not recommended, unless they are run at the non-
     UDMA4 device's lower speed.

SEE ALSO
     wdc(4),  wd(4),  wdpi(4)

BSDI BSD/OS			  May 3, 2001				     1

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