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.\" $OpenBSD: esp.4,v 1.2 1998/07/13 02:42:16 jason Exp $
.\"
.\" Copyright (c) 1998 The OpenBSD Project
.\" All rights reserved.
.\"
.\"
.Dd March 4, 1998
.Dt ESP 4 sparc
.Os
.Sh NAME
.Nm esp
.Nd ESP NCR 53c94 on-board or SBus SCSI controller
.Sh SYNOPSIS
.Cd "dma0 at obio0 addr 0xfa001000 level 4 " Pq sun4/300
.Cd "esp0 at obio0 addr 0xfa000000 level 4 flags 0xff0f"
.Cd ""
.Cd "dma0 at sbus0 slot ? offset ? " Pq on-board
.Cd "esp0 at sbus0 slot ? offset ? flags 0xff0f " Pq sun4c
.Cd "esp0 at dma0 flags 0xff0f " Pq sun4m
.Cd ""
.Cd "dma* at sbus? slot ? offset ? " Pq "SBus SCSI"
.Cd "esp* at sbus? slot ? offset ? flags 0xff0f " Pq "two flavours"
.Cd "esp* at dma? flags 0xff0f " Pq "depending on model"
.Sh DESCRIPTION
The
.Nm
is an on-board or SBus SCSI controller based on the NCR 53c94 chip, found
on Sun 4/300, sun4c and sun4m workstations.
.Sh DEVICE FLAGS
.Bl -tag -width speaker -compact
.It Bits 0-7 disable disconnect/reselect for the corresponding target
.It ""
.It Bits 8-15 disable synchronous negotiation for target "[bit - 8]"
.El
.Pp
The
.Nm
device flags may be OR'd together to enable any combination of
the features listed above. Targets 4 through 7 typically have
disconnect/reselect enabled on the premise that tape devices normally
have one of these targets. Tape devices should be allowed to disconnect
for the SCSI bus to operate acceptably.
.Sh SEE ALSO
.Xr si 4
.Xr sw 4
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