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Barracuda 4XL Product Manual, Rev. B 73

Notes.

[1] See

SCSI Interface Product Manual

(part number 77738479), Section 4.5

[2] Maximum SCSI asynchronous interface transfer rate is given in Section 4.2.3 of this manual.

[3] Synchronous Transfer Period is determined by negotiations between an Initiator and a Drive. The Drive is

capable of setting periods as given in Section 9.5. See also Sections 3.1.5.2 and 3.5.3.2 of the

SCSI Inter-

face Product Manual

for a description of synchronous data transfer operation.

General timing diagrams for SCSI interface operation are shown in the

SCSI Interface Product Manual

, Section

4.5. The specific timing values that apply to this drive are listed in Table 18.

Data In Byte Transfer (parameter) T24 4.5-12 0.04 µs

Data Out Byte Transfer (parameter) T25 4.5-13 0.04 µs

Next Data In Byte Access (parameter) T26 4.5-12 0.12 µs

Next Data Out Byte Access (parameter) T27 4.5-13 0.12 µs

Data In Byte Transfer (media) [2] T28 4.5-12 0.04 µs

Data Out Byte Transfer (media) [2] T29 4.5-13 0.04 µs

Next Data In Byte access (media [2] T30 4.5-12 0.12 µs

Next Data Out Byte access (media [2] T31 4.5-13 0.12 µs

MSG IN Byte Transfer T32 4.5-5,7,8,14,15 0.04 µs

MSG OUT Byte Transfer T33 4.5-2 0.04 µs

STATUS Byte Transfer T34 4.5-5,8,15 0.04 µs

Synchronous Data Transfer Characteristics:

Request Signal Transfer Period [3] – – various

Table 18: Disc drive SCSI timing (Continued)

Description

Waveform

symbol [1]

Waveform

table [1] Typical timing

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 93 94

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