Maxtor ATLAS 10K III Manual download pdf (Page 136)

SCSI Description

Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–69

MODE SELECT (6) Command (15h) (continued)

Table 5–34 Disconnect–Reconnect) — Field Descriptions

Default

Field Value Description

PS 0 Parameters Savable. This bit is only used with the MODE SENSE

command. A returned 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 indicates to the drive that it should use its

default ratio.

Bus Inactivity Limit 0 The Bus Inactivity Limit indicates the maximum duration of any

interconnect tenancy 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 increments, 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 indicates that there is no limit on the amount of data

transferred per connection. This field is reserved for the SCSI-

1/CCS operating mode.

EMDP 0 Enable MODIFY DATA POINTER. Not supported by the drive.

Fairness Arbitration 111b Indicates whether or not the target should use fair or unfair (e.g.,

priority) arbitration when beginning the interconnect tenancy.

Value Description

000b Disables the fairness algorithm. A fixed priority

scheme based on the SCSI ID assigned is used.

Non-Zero Any non-zero value enables the fairness algorithm

(SCSI SPI-2 ANSI standard, Appendix C).

DImm 0 Disconnect Immediate. When set to a 1, to reduce on-bus time, the

drive is forced to disconnect from the SCSI Bus after a SCSI

Command is received. Disconnect Immediate works only when a

typical, error-free command is received. Disconnect Immediate does

not apply in exception conditions (for example, SDTR received,

error, etc.).

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Maxtor ATLAS 10K III Manual Page 136

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