Seagate ST3146855LW, ST3146855LC, ST3300655LW, ST3300655LC, ST373455LC manual Disc drive Scsi timing

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