10.10Disc drive SCSI timing

Table 24: Disc drive SCSI timing

These values are not current Cheetah 15K.5 SCSI values, but are listed for information only.

 

Waveform

Waveform

 

Description

symbol [1]

table [1]

Typical timing

 

 

 

 

Target Select Time (no Arbitration)

T00

N/A

<1 μs

Target Select Time (with Arbitration)

T01

4.5-1,2

1.93 μs

Target Select to Command

T02

4.5-1

3.77 μs

Target Select to MSG Out

T03

4.5-2

1.57 μs

Identify MSG to Command

T04

4.5-3

3.36 μs

Command to Status

T05

4.5-5

Command Depen-

 

 

 

dent

Command to Data (para. In)

T06

4.5-9

Command Depen-

 

 

 

dent

Command to Data (para. Out)

T07

4.5-10

Command Depen-

 

 

 

dent

Command to Data (Write to Data Buffer)

T08

4.5-10

Command Depen-

 

 

 

dent

Command to Disconnect MSG

T09

4.5-6

Command Depen-

 

 

 

dent

Disconnect MSG to Bus Free

T10

4.5-6,14

0.52 μs

Disconnect to Arbitration (for Reselect)

T11

4.5-6

Command Depen-

This measures disconnected CMD over-

 

 

dent

head

 

 

 

Target win Arbitration (for Reselect)

T12

4.5-7

3.00 μs

Arbitration to Reselect

T13

4.5-7

1.60 μs

Reselect to Identify MSG In

T14

4.5-7

1.39 μs

Reselect Identify MSG to Status

T15

4.5-8

Command Depen-

 

 

 

dent

Reselect Identify MSG to Data (media)

T16

4.5-11

Command Depen-

 

 

 

dent

Data to Status

T17

4.5-15

Command Depen-

 

 

 

dent

Status to Command Complete MSG

T18

4.5-5,8,15

0.98 μs

Command Complete MSG to Bus Free

T19

4.5-5,8,15

0.51 μs

Data to Save Data Pointer MSG

T20

4.5-14

4.00 μs

Save Data Pointer MSG to Disconnect MSG

T21

4.5-14

0.79 μs

Command Byte Transfer

T22

4.5-4

0.04 μs

Next Command Byte Access:

 

4.5-4

 

Next CDB Byte Access (Byte 2 of 6)

T23.6.2

4.5-4

0.58 μs

Next CDB Byte Access (Byte 3 of 6)

T23.6.3

4.5-4

0.12 μs

Next CDB Byte Access (Byte 4 of 6)

T23.6.4

4.5-4

0.12 μs

Next CDB Byte Access (Byte 5 of 6)

T23.6.5

4.5-4

0.12 μs

Next CDB Byte Access (Byte 6 of 6)

T23.6.6

4.5-4

0.12 μs

72

Cheetah 15K.5 SCSI Product Manual, Rev. J

Page 78
Image 78
Seagate ST3146855LW, ST3146855LC, ST3300655LW, ST3300655LC, ST373455LC, ST373455LW, ST373207LW manual Disc drive Scsi timing