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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.
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.
Selection Time-Out
Delay
250
ms
1
Recommended minimum time a SCSI device should wait
for a BSY response during SELECTION or RESELECTION
before starting the time-out procedure.
1
Recommended Time.
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