Quantum DLT-S4 Guia do Utilizador descarregar pdf (Página 171)

100

101

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)

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

1 2 ... 166 167 168 169 170 171 172 173 174 175 176 ... 385 386

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