NAME
wdsc —
WD33c93 SCSI controller
SYNOPSIS
wdsc0 at pcc0 offset 0x4000 ipl 2
(mvme68k)
wdsc* at hpc? (sgi)
DESCRIPTION
The wdsc driver provides support for the
Western Digital WD33c93 and WD33c93B SCSI controllers.
In addition to sending the required SCSI commands to target
devices on the SCSI bus, the wdsc driver deals with
DMA, device interrupts, sync/async negotiation, and target
disconnects/reconnects.
DEVICE FLAGS
- Bits 0-7
- Disable disconnect/reselect for the corresponding target
- Bits 8-15
- Disable synchronous negotiation for target "[bit - 8]"
- Bits 16-23
- Disable tagged queuing for target "[bit - 16]"
The wdsc device flags may be OR'd together
to enable any combination of the features listed above. Tape devices should
be allowed to disconnect for the SCSI bus to operate acceptably.