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