Disc Drive Timing - Seagate ST32430N - Hawk 2.1 GB Hard Drive Product Manual

Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. A
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11.7 Disc drive SCSI timing
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)
Table 11.7-1. Disc drive SCSI timing
Waveform
Symbol [1]
T00
T01
T02
T03
T04
T05
T06
T07
T08
T09
T10
T11
T12
T13
T14
T15
T16
T17
T18
T19
T20
T21
T22
T23.6.2
T23.6.3
T23.6.4
T23.6.5
T23.6.6
Waveform
Table [1] Typical
N/A <1 µs
4.5-1,2 1.74 µs
4.5-1 3.87 µs
4.5-2 1.86 µs
4.5-3 3.56 µs
4.5-5 Command Dependent
4.5-9 Command Dependent
4.5-10 Command Dependent
4.5-10 Command Dependent
4.5-6 Command Dependent
4.5-6,14 0.52 µs
4.5-6 Command Dependent
4.5-7
4.5-7
4.5-7
4.5-8 Command Dependent
4.5-11 Command Dependent
4.5-15 Command Dependent
4.5-5,8,15
4.5-5,8,15
4.5-14
4.5-14
4.5-4
4.5-4
4.5-4 0.64 µs
4.5-4 0.12 µs
4.5-4 0.11 µs
4.5-4 0.12 µs
4.5-4 0.12 µs
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