Seagate Ultra 320 User Manual download pdf (Page 34)

20 Parallel SCSI Interface Product Manual, Rev. A )

2.5 SCSI bus timing

Unless otherwise indicated, the delay time measurements for each SCSI device, defined in paragraphs 2.5.1

through 2.5.60 shall be calculated from signal conditions existing at that SCSI device’s own SCSI bus connec-

tion. Thus, these measurements (except skew delay) can be made without considering delays in the cable.

Refer to the tables below for the actual timing values for these delays.

Table 4: SCSI bus control timing values in nanoseconds

[1] Cable skew is measured at each SCSI device connection with the transmitted skew subtracted from the

received skew.

[2] This is a recommended time. It is not mandatory.

Timing description

Reference Type

Timing

value (ns

unless

noted)

Arbitration delay

2.5.1 minimum 2.4 µs

Bus clear delay

2.5.4 maximum 800

Bus free delay

2.5.5 minimum 800

Bus set delay

2.5.6 maximum 1.6 µs

Bus settle delay

2.5.7 minimum 400

Cable skew [1]

2.5.8 maximum 4

Data release delay

2.5.21 maximum 400

DIFFSENS voltage filter time

2.5.22 minimum 100 ms

Physical disconnection delay

2.5.24 minimum 200 µs

Power on to selection [2]

2.5.25 maximum 10 s

QAS arbitration delay

2.5.26 minimum 1000

QAS assertion delay

2.5.27 maximum 200

QAS release delay

2.5.28 maximum 200

QAS non-data phase REQ(ACK) period

2.5.29 minimum 50

Reset delay

2.5.42 minimum 200

Reset hold time

2.5.43 minimum 25 µs

Reset to selection [2]

2.5.44 maximum 250 ms

Selection abort time

2.5.46 maximum 200 µs

Selection time-out delay [2]

2.5.47 minimum 250 ms

System deskew delay

2.5.51 minimum 45

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 185 186

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