Cheetah 15K.4 SCSI Product Manual, Rev. D
81
9.10
Disc drive SCSI timing
Table 32:
Disc drive SCSI timing
These values are not current Cheetah 15K.4 SCSI values, but are listed for information only.
Description
Waveform
symbol [1]
Waveform
table [1]
Typical timing
Target Select Time (no Arbitration)
T00
N/A
<1
µ
s
Target Select Time (with Arbitration)
T01
4.5-1,2
1.93
µ
s
Target Select to Command
T02
4.5-1
3.77
µ
s
Target Select to MSG Out
T03
4.5-2
1.57
µ
s
Identify MSG to Command
T04
4.5-3
3.36
µ
s
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
µ
s
Disconnect to Arbitration (for Reselect)
This measures disconnected CMD over-
head
T11
4.5-6
Command Depen-
dent
Target win Arbitration (for Reselect)
T12
4.5-7
3.00
µ
s
Arbitration to Reselect
T13
4.5-7
1.60
µ
s
Reselect to Identify MSG In
T14
4.5-7
1.39
µ
s
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
µ
s
Command Complete MSG to Bus Free
T19
4.5-5,8,15
0.51
µ
s
Data to Save Data Pointer MSG
T20
4.5-14
4.00
µ
s
Save Data Pointer MSG to Disconnect MSG
T21
4.5-14
0.79
µ
s
Command Byte Transfer
T22
4.5-4
0.04
µ
s
Next Command Byte Access:
4.5-4
Next CDB Byte Access (Byte 2 of 6)
T23.6.2
4.5-4
0.58
µ
s
Next CDB Byte Access (Byte 3 of 6)
T23.6.3
4.5-4
0.12
µ
s
Next CDB Byte Access (Byte 4 of 6)
T23.6.4
4.5-4
0.12
µ
s
Next CDB Byte Access (Byte 5 of 6)
T23.6.5
4.5-4
0.12
µ
s
Next CDB Byte Access (Byte 6 of 6)
T23.6.6
4.5-4
0.12
µ
s
Содержание Cheetah ST3146854
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