Seagate ST32151N - Disc Drive SCSI Timing

64 Hawk 2XL Product Manual, Rev. B
9.9 Disc drive SCSI timing
Table 12: Disc drive SCSI timing*
Description
Waveform
Symbol [1]
Waveform
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 Dependent
Command to Data (para. In) T06 4.5-9 Command Dependent
Command to Data (para. Out) T07 4.5-10 Command Dependent
Command to Data (Write to Data Buffer) T08 4.5-10 Command Dependent
Command to Disconnect MSG T09 4.5-6 Command Dependent
Disconnect MSG to Bus Free T10 4.5-6,14 0.52 µs
Disconnect to Arbitration (for Reselect) T11 4.5-6 Command Dependent
This measures disconnected CMD overhead.
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 Dependent
Reselect Identify MSG to Data (media) T16 4.5-11 Command Dependent
Data to Status T17 4.5-15 Command Dependent
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 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
Next CDB Byte Access (Byte 2 of 10) T23.10.2 4.5-4 0.59 µs
Next CDB Byte Access (Byte 3 of 10) T23.10.3 4.5-4 0.11 µs +
1 µs
Next CDB Byte Access (Byte 4 of 10) T23.10.4 4.5-4 0.12 µs +
1 µs
Next CDB Byte Access (Byte 5 of 10) T23.10.5 4.5-4 0.11 µs +
1 µs
Next CDB Byte Access (Byte 6 of 10) T23.10.6 4.5-4 0.11 µs +
1 µs
Next CDB Byte Access (Byte 7 of 10) T23.10.7 4.5-4 0.13 µs +
1 µs
Next CDB Byte Access (Byte 8 of 10) T23.10.8 4.5-4 0.12 µs +
1 µs
Next CDB Byte Access (Byte 9 of 10) T23.10.9 4.5-4 0.12 µs +
1 µs
Next CDB Byte Access (Byte 10 of 10) T23.10.10 4.5-4 0.12 µs
Data In Byte Transfer (parameter) T24 4.5-12 0.04 µs
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