User's Guide

Page 94 DDS-4 SCSI Interface Manual, Rev. B
Disconnect/Reconnect Page (02h)
The Disconnect/Reconnect page allows the host to tune performance of the SCSI
bus. The following table illustrates this page.
Byte
Bits
7 6 5 4 3 2 1 0
0 0 0 | Page Code (02h)
1 Page Length (0Eh)
2 0 0 0 0 0 0 0 0
3 0 0 0 0 0 0 0 0
4 0 0 0 0 0 0 0 0
5 0 0 0 0 0 0 0 0
6 0 0 0 0 0 0 0 0
7 0 0 0 0 0 0 0 0
8 0 0 0 0 0 0 0 0
9 0 0 0 0 0 0 0 0
10 MSB—Maximum Burst Size
11 Maximum Burst Size—LSB
12 0 0 0 0 0 0 DTDC
13 0 0 0 0 0 0 0 0
14 0 0 0 0 0 0 0 0
15 0 0 0 0 0 0 0 0
Disconnect/Reconnect Page Field Descriptions
The following table describes the fields in the Disconnect/Reconnect page.
Field
Name Bytes Bits Description
Page Code 0 0-5 The Page Code field must be set to 02h to select this page.
Page
Length
1 The Page Length field must be set to 14 (0Eh), which indicates that 14
parameter bytes follow the Page Length byte.
Maximum
Burst Size
10-11 The Maximum Burst Size field specifies the maximum amount of data
the drive can transfer during a Data phase before disconnecting if the
initiator granted the disconnect privilege.
This value is in increments of 512 bytes. That is, a value of one means
512 bytes; a value of two means 1024 bytes, and so forth.
Data
Transfer
Disconnect
Control
(DTDC)
12 0-1 The Data Transfer Disconnect Control (DTDC) field values are as
follows:
00 Data transfer disconnect control is not used.
01 The target does not attempt to disconnect once
the data transfer of a command has been started
until all data the command is to transfer has been
completed.
10 Reserved.
11 The target does not attempt to disconnect once
the data transfer of command has been started
until the command is complete.