Quantum DLT-S4 Guide de l'utilisateur télécharger pdf (Page 142)

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101

Chapter 4 SCSI Commands

MODE SELECT (6) / (10) Command (15h / 55h)

DLT-S4 Interface Reference Guide 108

Table 67 Parallel SCSI —

Disconnect / Reconnect MODE

SELECT Page — Field

Descriptions

Field Description

PS Parameters Savable. For

MODE SELECT, must be set to 0.

SPF SubPage Format. Always set to 0. Indicates that this page uses the page_0

page format.

Page Code Identifies the type of

MODE SELECT page being transferred. A value of 02h

identifies this as the Disconnect / Reconnect Page.

Page Length Indicates the number of bytes in the page, excluding bytes 0 and 1. The length

is returned in

MODE SENSE commands and must subsequently be set to the

same value when performing

MODE SELECT.

Buffer Full Ratio Must be set to 0.

Buffer Empty Ratio Must be set to 0.

Bus Inactivity Limit Must be set to 0.

Disconnect Time Limit Must be set to 0.

Connect Time Limit Must be set to 0.

Maximum Burst Size Indicates the maximum amount of data that will be transferred without

disconnecting, in units of 512 bytes. The default value is 80h for 64 KBytes. A

value of 0 indicates there is no limit to the amount of data that may be

transferred without disconnecting.

EMDP Enable Modify Data Pointers. Must be set to 0.

Fair Arbitration Must be set to 0.

DIMM Disconnect Immediate. Must be set to 0.

DTDC Data Transfer Disconnect Control. Must be set to 0.

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