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5-42 Maxtor Atlas 10K V
5.12.7 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 5-62 and Table 5-63.
Table 5-62 Disconnect–Reconnect Page (Page 2)
Table 5-63 Disconnect-Reconnect-Field Descriptions (Page 2)
Bit
Byte
765 4 3210
0 PS Rsvd Page Code (02h)
1 Page Length (0Eh)
2 Buffer Full Ratio
3 Buffer Empty Ratio
4 – 5 Bus Inactivity Limit
6 – 7 Disconnect Time Limit
8 – 9 Connect Time Limit
10 – 11 Maximum Burst Size
12 EMDP Fairness Arbitration DImm DTDC
13 Reserved
14 – 15 First Burst Size
Field
Default
Value
Description
PS 0
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.
Buffer Full
Ratio
0
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.
Buffer Empty
Ratio
0
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. Not supported by the drive.
Bus Inactivity
Limit
0
The Bus Inactivity Limit indicates the maximum duration of any interconnect ten-
ancy during which no data is transferred. Not supported by the drive.
Disconnect
Time Limit
0
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.
Connect Time
Limit
0
The Connect Time Limit indicates the maximum duration of a single interconnect
tenancy. Not supported by the drive.
Maximum Burst
Size
0
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.