'\" te
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.TH scsi_address 9S "30 Aug 1995" "SunOS 5.11" "Data Structures for Drivers"
.SH NAME
scsi_address \- SCSI address structure
.SH SYNOPSIS
.LP
.nf
#include <sys/scsi/scsi.h> 
.fi

.SH INTERFACE LEVEL
.sp
.LP
Solaris architecture specific (Solaris DDI)
.SH DESCRIPTION
.sp
.LP
A \fBscsi_address\fR structure defines the addressing components for a
\fBSCSI\fR target device. The address of the target device is separated into
two components: target number and logical unit number. The two addressing
components are used to uniquely identify any type of \fBSCSI\fR device;
however, most devices can be addressed with the target component of the
address.
.sp
.LP
In the case where only the target component is used to address the device, the
logical unit should be set to  \fB0\fR. If the \fBSCSI\fR target device
supports logical units, then the \fBHBA\fR must interpret the logical units
field of the data structure.
.sp
.LP
The \fBpkt_address\fR member of a \fBscsi_pkt\fR(9S) is initialized by
\fBscsi_init_pkt\fR(9F).
.SH STRUCTURE MEMBERS
.sp
.in +2
.nf
scsi_hba_tran_t   *a_hba_tran;  /* Transport vectors for the SCSI bus */
ushort_t          a_target;     /* SCSI target id */
uchar_t           a_lun;        /* SCSI logical unit */
.fi
.in -2

.sp
.LP
\fBa_hba_tran\fR is a pointer to the controlling \fBHBA\fR's transport vector
structure. The \fBSCSA\fR interface uses this field to pass any transport
requests from the \fBSCSI\fR target device drivers to the \fBHBA\fR driver.
.sp
.LP
\fBa_target\fR is the target component of the \fBSCSI\fR address.
.sp
.LP
\fBa_lun\fR is the logical unit component of the \fBSCSI\fR address. The
logical unit is used to further distinguish a \fBSCSI\fR target device that
supports multiple logical units from one that does not. The \fBmakecom\fR(9F)
family of functions use the \fBa_lun\fR field to set the logical unit field in
the \fBSCSI\fR \fBCDB\fR, for compatibility with \fBSCSI-1\fR.
.SH SEE ALSO
.sp
.LP
\fBmakecom\fR(9F), \fBscsi_init_pkt\fR(9F), \fBscsi_hba_tran\fR(9S),
\fBscsi_pkt\fR(9S)
.sp
.LP
\fIWriting Device Drivers\fR