Disc Drive Scsi Timing - Seagate ST118273N Product Manual

Barracuda 18 Product Manual, Rev. C
9.10

Disc drive SCSI timing

Table 14: Disc drive SCSI timing
These values are not current Barracuda 18 values, but are listed for information only.
Description
Target Select Time (no Arbitration)
Target Select Time (with Arbitration)
Target Select to Command
Target Select to MSG Out
Identify MSG to Command
Command to Status
Command to Data (para. In)
Command to Data (para. Out)
Command to Data (Write to Data Buffer)
Command to Disconnect MSG
Disconnect MSG to Bus Free
Disconnect to Arbitration (for Reselect)
This measures disconnected CMD overhead
Target win Arbitration (for Reselect)
Arbitration to Reselect
Reselect to Identify MSG In
Reselect Identify MSG to Status
Reselect Identify MSG to Data (media)
Data to Status
Status to Command Complete MSG
Command Complete MSG to Bus Free
Data to Save Data Pointer MSG
Save Data Pointer MSG to Disconnect MSG
Command Byte Transfer
Next Command Byte Access:
Next CDB Byte Access (Byte 2 of 6)
Next CDB Byte Access (Byte 3 of 6)
Next CDB Byte Access (Byte 4 of 6)
Next CDB Byte Access (Byte 5 of 6)
Next CDB Byte Access (Byte 6 of 6)
Next CDB Byte Access (Byte 2 of 10)
Next CDB Byte Access (Byte 3 of 10)
Next CDB Byte Access (Byte 4 of 10)
Next CDB Byte Access (Byte 5 of 10)
Next CDB Byte Access (Byte 6 of 10)
Next CDB Byte Access (Byte 7 of 10)
Next CDB Byte Access (Byte 8 of 10)
Next CDB Byte Access (Byte 9 of 10)
Waveform Waveform
symbol [1] table [1]
T00 N/A
T01 4.5-1,2
T02 4.5-1
T03 4.5-2
T04 4.5-3
T05 4.5-5
T06 4.5-9
T07 4.5-10
T08 4.5-10
T09 4.5-6
T10 4.5-6,14
T11 4.5-6
T12 4.5-7
T13 4.5-7
T14 4.5-7
T15 4.5-8
T16 4.5-11
T17 4.5-15
T18 4.5-5,8,15
T19 4.5-5,8,15
T20 4.5-14
T21 4.5-14
T22 4.5-4
4.5-4
T23.6.2 4.5-4
T23.6.3 4.5-4
T23.6.4 4.5-4
T23.6.5 4.5-4
T23.6.6 4.5-4
T23.10.2 4.5-4
T23.10.3 4.5-4
T23.10.4 4.5-4
T23.10.5 4.5-4
T23.10.6 4.5-4
T23.10.7 4.5-4
T23.10.8 4.5-4
T23.10.9 4.5-4
73
Typical timing
<1.4 µs
1.93 µs
3.77 µs
1.57 µs
3.36 µs
Command Dependent
Command Dependent
Command Dependent
Command Dependent
Command Dependent
0.52 µs
Command Dependent
3.00 µs
1.60 µs
1.39 µs
Command Dependent
Command Dependent
Command Dependent
0.98 µs
0.51 µs
4.00 µs
0.79 µs
0.04 µs
0.58 µs
0.12 µs
0.12 µs
0.12 µs
0.12 µs
0.59 µs
0.11 µs ±1 µs
0.12 µs ±1 µs
0.11 µs ±1 µs
0.11 µs ±1 µs
0.13 µs ±1 µs
0.12 µs ±1 µs
0.12 µs ±1 µs