Quantum DLTtape DLT 4000, Product Manual

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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.
1
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
ms
1
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.
1
Recommended Time.