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SCSI Description

Quantum DLT 8000 Tape System 3-9

Table 3–4 SCSI Bus Timing Values (continued)

Timing Description Value Description

Bus Settle Delay 400 ns Minimum time to wait for the bus to settle after

changing certain control signals as called out in the

protocol definitions.

Cable Skew Delay 10 ns Maximum difference in propagation time allowed

between any two SCSI bus signals measured between

any two SCSI devices.

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

1 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.

Selection Time-out

Delay

250

Recommended minimum time a SCSI device should wait

for a BSY response during SELECTION or RESELECTION

before starting the time-out procedure.

Recommended Time.

1 2 ... 106 107 108 109 110 111 112 113 114 115 116 ... 407 408

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