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MODE SELSECT
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. The default value is 0.
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. The default value is 1FBCh.
Note: 512 4,028(0FBCh)=2,062,336 bytes which means that the Maximum Burst Size is approximately equal to
SDX-250V Buffer size for SCSI side.
DTDC: This field defines further restrictions on when a disconnect is permitted.
DTDC
00b
Data transfer disconnect control is not used. Disconnect is controlled by the other field in this page.
A target shall not attempt to disconnect once the data transfer of a command has started until all
01b
data the command is to transfer has been transferred. The connect time limit and bus inactivity limit
are ignored during the data transfer.
10b
Reserved
A target shall not attempt to disconnect once the data transfer of a command has started until the
11b
command is complete. The connect time limit and bus inactivity limit are ignored once data transfer
has started.
SONY AIT-E Turbo drive SDX-250V series Ver.1.0
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
Description
6.Command Specification
2
1
0
(LSB)
(LSB)
(LSB)
(LSB)
DTDC
6-29
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