Disconnect-Reconnect Page (02H) - Maxtor ATLAS 10K IV User Manual

SCSI Description
5.14.7 Disconnect–Reconnect Page (02h)
The Disconnect–Reconnect Page provides the application client the means to attempt
to optimize the performance of the delivery subsystem. The data format and field
descriptions are described in Table 5-64 and Table 5-65.
Bit
Byte
0
1
2
3
4 – 5
6 – 7
8 – 9
10 – 11
12 EMDP
13
14 – 15
Table 5-65
Default
Field
Value
PS 0
Buffer Full
0
Ratio
Buffer Empty
0
Ratio
Bus Inactivity
0
Limit
Disconnect
0
Time Limit
Connect Time
0
Limit
Maximum Burst
0
Size
EMDP 0
5-44 Maxtor Atlas 10K IV
Disconnect–Reconnect Page (Page 2)
Table 5-64
7 6 5
PS Rsvd
Fairness Arbitration
Disconnect-Reconnect-Field Descriptions (Page 2)
Parameters Savable. This bit is only used with the MODE SENSE command. A re-
turned value of 1 indicates that the target is capable of saving the page in a non-
volatile, vendor-specific location. The bit is reserved with the MODE SELECT
command.
The Buffer Full Ratio indicates how full the buffer should be prior to requesting an
interconnect tenancy. Applies to READ operations only. The default of 0 indicates
to the drive that it should use its default ratio.
The Buffer Empty Ratio indicates how full the buffer should be prior to requesting
an interconnect tenancy. Applies to READ operations only. The default of 0 indi-
cates to the drive that it should use its default ratio.
The Bus Inactivity Limit indicates the maximum duration of any interconnect ten-
ancy during which no data is transferred. Not supported by the drive.
The Disconnect Time Limit specifies the minimum time, in 100 microsecond in-
crements, that the drive waits after releasing the SCSI bus before reselecting. The
drive supports a maximum value of 0xFF. Values greater than 0xFF are treated as
0xFF. The default value of 0 indicates that the drive can reslect immediately after
releasing the bus.
The Connect Time Limit indicates the maximum duration of a single interconnect
tenancy. Not supported by the drive.
The Maximum Burst Size
specifies the maximum amount of data that the drive will transfer during a data
phase before disconnecting from the bus, assuming it was given the disconnect
privilege. This value is expressed in increments of data sectors (that is, a value of
1 indicates 512 bytes, a value of 2 indicates 1024 bytes). The default value of 0 in-
dicates that there is no limit on the amount of data transferred per connection. This
field is reserved for the SCSI-1/CCS operating mode.
Enable MODIFY DATA POINTER. Not supported by the drive.
4 3
Page Code (02h)
Page Length (0Eh)
Buffer Full Ratio
Buffer Empty Ratio
Bus Inactivity Limit
Disconnect Time Limit
Connect Time Limit
Maximum Burst Size
DImm
Reserved
First Burst Size
Description
2 1 0
DTDC