User's Guide

Page 78 DDS-4 SCSI Interface Manual, Rev. B
Disconnect/Reconnect Page Field Descriptions
The following table describes the fields in the Disconnect/Reconnect page.
Field
Name Bytes Bits Description
Page
Code
0 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.
Maximu
m Burst
Size
10-11 The Maximum Burst Size field specifies the maximum amount of data
that the drive can transfer during a Data phase before disconnecting if
the initiator granted the disconnect capability.
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.
A value of zero (0000h) indicates that no limit exists on the amount of
data transferred per connection. In that case, the drive does not have
to disconnect until all requested data is transferred.
On read operations, the drive disconnects when drive buffer is empty,
and the Allocation Length has not been satisfied. On write operations,
the drive disconnects when the drive buffer is full, and the Transfer
Length has not been exhausted.
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.
Control Mode Page (0Ah)
The Control Mode page allows the host to enable or disable the generation of a
Check Condition when log parameters whose ETC bits are set to 1 meet their
Threshold Condition. The layout of this page is shown in the following table.
Byte
Bits
7 6 5 4 3 2 1 0
0 0 0 | Page Code (0Ah)
1 Page Length (06h)
2 0 0 0 0 0 0 0 RLEC
3 0 0 0 0 0 0 0 DQUE
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