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4.5 Timing Rule
C156-E224-01EN 4-47
Table 4.75 Timing specifications (2 of 3)
No. Name Standard Timing specification
6 Bus Settle Delay 400 ns min. Minimum wait period between the time a
particular control signal condition changes and
the time the bus condition is stabilized.
7 Cable Skew
Delay
10 ns max. Maximum allowable difference in transmission
time over the interface cable between any two
bus signals from any two SCSI devices.
8 Data release
Delay
400 ns max. Maximum allowable period between the time an
I/O signal changes its status from false to true
and the time the INIT stops driving data bus
signals.
9 Deskew Delay 45 ns min. Time for compensation for skew involved in bus
signal transmission.
10 Hold Time 45 ns min. In synchronous data transfer mode, the
minimum time during which the transfer data on
the DATA BUS from the leading edge of the
REQ or ACK signal pulse must be maintained to
compensate for the hold time in the SCSI device
receiving data.
11 Negation Period 90 ns min. In synchronous data transfer mode, the
minimum time from the trailing edge of an REQ
signal to the leading edge of the next REQ
signal, or from the trailing edge of an ACK
signal to the leading edge of the next ACK
signal.
12 Power-On to
Selection Time
10 sec max. Maximum time from when the TARG is turned
on to the time the TARG can post the correct
status and sense data for the TEST UNIT
READY, INQUIRY or REQUEST SENSE
command.
13 Reset to
Selection Time
250 ms max. Maximum time from when the RESET condition
(hard RESET) is released to the time the TARG
can post the correct status and sense data for the
TEST UNIT READY, INQUIRY or REQUEST
SENSE command.
14 Reset Hold
Time
25µs min. The minimum time during which the RST signal
must be held true to create a RESET condition.
A maximum time is not defined.
15 Selection Abort
Time
200µs max. In a SELECTION or RESELECTION phase, the
maximum allowable period between the time the
SCSI device recognizes itself as selected and the
time it replies with a BSY signal.