11 drive activity led – Seagate Barracuda ST318418N User Manual

Page 84

Barracuda 36ES2 Product Manual, Rev. B

Notes.

[1]

See the

SCSI Interface Product Manual, part number 75789509, timing examples section.

[2]

Maximum SCSI asynchronous interface transfer rate is given in Section 4.2.3 of this manual.

[3]

Synchronous Transfer Period is determined by negotiations between an Initiator and a Drive. The Drive is
capable of setting periods as given in Section 9.5. See also the Synchronous data transfer section and the
Extended messages section of the

SCSI Interface Product Manual, for a description of synchronous data

transfer operation.

9.11

Drive activity LED

The following table provides drive activity LED status.

Data In Byte Transfer (parameter)

T24

4.5-12

0.04

µs

Data Out Byte Transfer (parameter)

T25

4.5-13

0.04

µs

Next Data In Byte Access (parameter)

T26

4.5-12

0.12

µs

Next Data Out Byte Access (parameter)

T27

4.5-13

0.12

µs

Data In Byte Transfer (media) [2]

T28

4.5-12

0.04

µs

Data Out Byte Transfer (media) [2]

T29

4.5-13

0.04

µs

Next Data In Byte access (media [2]

T30

4.5-12

0.12

µs

Next Data Out Byte access (media [2]

T31

4.5-13

0.12

µs

MSG IN Byte Transfer

T32

4.5-5,7,8,14,15

0.04

µs

MSG OUT Byte Transfer

T33

4.5-2

0.04

µs

STATUS Byte Transfer

T34

4.5-5,8,15

0.04

µs

Synchronous Data Transfer Characteristics:

Request Signal Transfer Period [3]

–

various (800 ns max)

Table 18:

Drive activity LED status

Spindle status

Command status

LED status

Spinning up with DC power applied

N/A

On until spinup is complete

Spun down

Start Unit