Reference Guide

Chapter 4 SCSI Commands
MODE SELECT (6) / (10) Command (15h / 55h)
DLT-S4 Interface Reference Guide 137
SPI Report Transfer
Capabilities Mode Subpage
(19h/04h)
4
The SPI Report Transfer Capabilities Mode Subpage, shown in figure 74,
is used to report the transfer capabilities for the SCSI target port for
Parallel SCSI only. The values in this mode subpage are not changeable
via a
MODE SELECT command. For additional information, see figure 68.
Figure 74 Parallel SCSI — SPI
Report Transfer Capabilities
Mode Subpage — Data Format
Sent
PCOMP_EN
The SENT PCOMP_EN bit contains the value on the PCOMP_EN bit sent by the SCSI
target port for the current I_T nexus.
Received
PCOMP_EN
The RECEIVED PCOMP_EN bit contains the value on the PCOMP_EN bit received
by the SCSI target port for the current I_T nexus.
Bit
7 6 5 4 3 2 1 0
Byte
0 PS (0) SPF (1) Page Code (19h)
1 Subpage Code (04h)
2 — 3
(MSB)
Page Length (0Ah)
(LSB)
4 Reserved
5 Reserved Protocol Identifier (1h)
6 Minimum Transfer Period Factor
7 Reserved
8 Maximum REQ/ACK Offset
9 Maximum Transfer Width Exponent
Field Description