Cheetah 36XL Product Manual, Rev. E

73

Table 18: Disc drive SCSI timing (Continued)

 

Waveform

Waveform

 

Description

symbol [1]

table [1]

Typical timing

 

 

 

 

 

 

 

 

Data In Byte Transfer (parameter)

T24

4.5-12

0.04 s

 

 

 

 

Data Out Byte Transfer (parameter)

T25

4.5-13

0.04 s

 

 

 

 

Next Data In Byte Access (parameter)

T26

4.5-12

0.12 s

 

 

 

 

Next Data Out Byte Access (parameter)

T27

4.5-13

0.12 s

 

 

 

 

Data In Byte Transfer (media) [2]

T28

4.5-12

0.04 s

 

 

 

 

Data Out Byte Transfer (media) [2]

T29

4.5-13

0.04 s

 

 

 

 

Next Data In Byte access (media [2]

T30

4.5-12

0.12 s

 

 

 

 

Next Data Out Byte access (media [2]

T31

4.5-13

0.12 s

 

 

 

 

MSG IN Byte Transfer

T32

4.5-5,7,8,14,15

0.04 s

 

 

 

 

MSG OUT Byte Transfer

T33

4.5-2

0.04 s

 

 

 

 

STATUS Byte Transfer

T34

4.5-5,8,15

0.04 s

 

 

 

 

Synchronous Data Transfer Characteristics:

 

 

 

 

 

 

 

Request Signal Transfer Period [3]

various (800 ns max)

 

 

 

 

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.

9.11Drive activity remote LED signal status

The following table provides drive activity remote LED signal status

Note. There is no drive activity LED mounted on the drive PCBA.

Table 19: Drive activity remote LED signal status

Spindle status

Command status

Remote LED signal status

 

 

 

 

 

 

Spinning up with DC power applied

N/A

On until spinup is complete

 

 

 

Spun down

Start Unit

On while processing the command

 

 

 

Powered down by removal of DC power

N/A

Off due to absence of power

 

 

 

Spun up

Stop Unit

On while processing the command

 

 

 

Spun down

No command activity

Off

 

 

 

Spun down

Write/Read Buffer

On while processing the command

 

 

 

Spun down

SCSI Bus Reset

On while processing the reset

 

 

 

Spun down

Test Unit Ready

On while processing the command

 

 

 

Spun up

No command activity

Off

 

 

 

Spun up

Write/Read

On while processing the command

 

 

 

Spun up

SCSI Bus Reset

On while processing the reset

 

 

 

Spun up

Test Unit Ready

On while processing the command

 

 

 

Spun up

Format with Immediate option on

On while the command is initially processed

 

 

 

Spun up

Format without Immediate

LED toggles on/off on each cylinder boundary

 

 

 

Page 83
Image 83
Seagate ST336705LW/LC, ST318405LW/LC, ST39205LW/LC manual Drive activity remote LED signal status