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6.Command Specification
Additional Page Length: Indicates the number of bytes in that page. The value does not, however, include bytes 0
and 1. The length is returned on MODE SENSE and must subsequently be set to the same value when performing
MODE SELECT.
If the page length does not match that expected by the drive a CHECK CONDITION status is returned with the sense
key to set to ILLEGAL REQUEST.
The drive also returns a CHECK CONDITION status with an ILLEGAL REQUEST sense key if the Host sends an
unsupported Page Code, a page field with values that are not supported or are not changeable. In this case, no
parameters will have been changed by the command.
6.7.1. Disconnect-Reconnect Page (02h)
The drive supports the Disconnect-Reconnect Page which has the following format:
Bit
7
Byte
0
PS(0)
1
2
3
4
(MSB)
5
6
(MSB)
7
8
(MSB)
9
10
(MSB)
11
12
13
14
15
Buffer Full Ratio, Buffer Empty Ratio, Bus Inactivity Limit and Connect Time Limit fields are not supported by the
drive if set to non-ZERO values a CHECK CONDITION status is returned with ILLEGAL REQUEST sense key set.
Disconnect Time Limit: This field indicates the minimum time in 100 microsecond increments that the drive shall
wait after releasing the SCSI bus before attempting re-selection. This should be 0 and this is non-changeable field.
Maximum Burst Size: This field defines the maximum amount of data that the drive shall transfer during a data
phase before disconnecting. This value is expressed in increments of 512 bytes. This is non-changeable field and
should be 0FBCh.
Note: 512 4,028(0FBCh) = 2,062,336 bytes which means that the Maximum Burst Size is approximately equal to
SDX-450V Buffer size for SCSI side.
DTDC: This field defines further restrictions on when a disconnect is permitted.
6-38
Table 6-35: Disconnect-Reconnect Page
6
5
Reserved
Buffer Empty Ratio (00h)
Bus Inactivity Limit (00h)
Connect Time Limit (00h)
Reserved
4
3
Page Code (02h)
Page Length (0Eh)
Buffer Full Ratio (00h)
Disconnect Time Limit
Maximum Burst Size
Reserved
Reserved
Reserved
SONY AIT-1 Turbo drive SDX-450V series Ver.1.0
MODE SELECT
2
1
0
(LSB)
(LSB)
(LSB)
(LSB)
DTDC
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