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SCSI Description

Quantum DLT 4000 Tape Drive 3-9

Table 3–4 SCSI Bus Timing Values (continued)

Timing Description Value Description

Data Release Delay 400 ns Maximum time for an initiator to release the DATA

BUS signals following the transition of the I/O signal

from false to true.

Deskew Delay 45 ns Minimum time required to wait for all signals

(especially data signals) to stabilize at their correct,

final value after changing.

Disconnection Delay 200 µs Minimum time that a drive waits after releasing BSY

before participating in an ARBITRATION when

honoring a DISCONNECT message from the initiator.

Hold Time 45 ns Minimum time added between the assertion of REQ

or ACK and changing the data lines to provide hold

time in the initiator or drive while using standard

(slow) synchronous data transfers.

Negation Period 90 ns Minimum time that a drive negates REQ while using

synchronous data transfers; also, the minimum time

than an initiator negates ACK while using

synchronous data transfers.

Power-On to

Selection

10 s

Recommended maximum time from power

application until a drive is able to respond with

appropriate status and sense data to the TEST UNIT

READY, INQUIRY, and REQUEST SENSE commands.

Reset to Selection

Time

250

Recommended maximum time after a hard RESET

condition until a drive is able to respond with

appropriate status and sense data to the TEST UNIT

READY, INQUIRY, and REQUEST SENSE commands.

Reset Hold Time 25 µs Minimum time for which RST is asserted; there is no

maximum time.

Selection Abort Time 200 µs Maximum time that a drive (or initiator) takes from its

most recent detection of being selected (or

reselected) until asserting a BSY response.

Recommended Time.

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Quantum DLT 4000 Handbuch Seite 71