Seagate ST318436LW - Disc Drive SCSI Timing

Barracuda 18XL Product Manual, Rev. A 83
SCSI devices providing terminator power (TERMPWR) must have the following characteristics:
8-bit SCSI V TERM = 4.25 V to 5.25 V
800 mA minimum source drive capability
1.0 A maximum
16-bit SCSI V TERM = 4.25 V to 5.25 V
1,500 mA minimum source drive capability
3.0 A maximum
9.10 Disc drive SCSI timing
Table 15: Disc drive SCSI timing
These values are not current Barracuda 18XL values, but are listed for information only.
Description
Waveform
symbol [1]
Waveform
table [1] Typical timing
Target Select Time (no Arbitration) T00 N/A <1.4
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 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
µ
s
Disconnect to Arbitration (for Reselect)
This measures disconnected CMD overhead
T11 4.5-6 Command Dependent
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 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
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
Next CDB Byte Access (Byte 2 of 10) T23.10.2 4.5-4 0.59
µ
s
Next CDB Byte Access (Byte 3 of 10) T23.10.3 4.5-4 0.11
µ
s ±1
µ
s