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62 Elite 23 Product Manual, Rev. A

9.10 Disc drive SCSI timing

Table 15: Disc drive SCSI timing

Description

Waveform

symbol [1]

Waveform

table [1] Typical timing Maximum timing

Target select time (no arbitration) T00 N/A <1 µs <250 µs

Target select time (with arbitration) T01 4.5-1,2 2.31 µs 2.36 µs

Target select to command T02 4.5-1 3.33 µs 3.34 µs

Target select to MSG out T03 4.5-2 1.51 µs 1.54 µs

Identify MSG to command T04 4.5-3 3.34 µs 3.36 µs

Command to status T05 4.5-5 Command dependent Command dependent

Command to data (para. in) T06 4.5-9 Command dependent Command dependent

Command to data (para. out) T07 4.5-10 Command dependent Command dependent

Command to data (write to data

buffer)

T08 4.5-10 Command dependent Command dependent

Command to disconnect MSG T09 4.5-6 Command dependent Command dependent

Disconnect MSG to bus free T10 4.5-6,14 0.64 µs 0.68 µs

Disconnect to arbitration (for reselect)

This measures disconnected CMD

overhead.

T11 4.5-6–b Command dependent Command dependent

Target win arbitration (for reselect) T12 4.5-7 2.8 µs

Arbitration to reselect T13 4.5-7 1.8 µs

Reselect to identify MSG in T14 4.5-7 1.34 µs

Reselect identify MSG to status T15 4.5-8 Command dependent Command dependent

Reselect identify MSG to data (media) T16 4.5-11 Command dependent Command dependent

Data to status T17 4.5-15 Command dependent Command dependent

Status to command complete MSG T18 4.5-5,8,15 1.0 µs

Command complete MSG to bus free T19 4.5-5,8,15 0.75 µs

Data to save data pointer MSG T20 4.5-14 4.5 µs

Save data pointer MSG to

disconnect MSG

T21 4.5-14 0.75 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 0.55 µs 0.56 µs

Next CDB byte access (byte 3 of 6) T23.6.3 4.5-4 0.10 µs 0.10 µs

Next CDB byte access (byte 4 of 6) T23.6.4 4.5-4 0.09 µs 0.10 µs

Next CDB byte access (byte 5 of 6) T23.6.5 4.5-4 0.13 µs 0.14 µs

Next CDB byte access (byte 6 of 6) T23.6.6 4.5-4 0.13 µs 0.14 µs

Next CDB byte access (byte 2 of 10) T23.10.2 4.5-4 0.59 µs 0.60 µs

Next CDB byte access (byte 3 of 10) T23.10.3 4.5-4 0.14 µs 0.14 µs

Next CDB byte access (byte 4 of 10) T23.10.4 4.5-4 0.13 µs 0.14 µs

Next CDB byte access (byte 5 of 10) T23.10.5 4.5-4 0.12 µs 0.12 µs

Next CDB byte access (byte 6 of 10) T23.10.6 4.5-4 0.11 µs 0.12 µs

Next CDB byte access (byte 7 of 10) T23.10.7 4.5-4 0.10 µs 0.10 µs

Next CDB byte access (byte 8 of 10) T23.10.8 4.5-4 0.09 µs 0.10 µs

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 83 84

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