MB86606A Datasheet, PDF (47/64 Pages) Fujitsu Component Limited. – FAST-20 SCSI Protocol Controller

MB86606A
(2) Initiator asynchronous output timing (initiator → target)
Parameter
Symbol
ACK set Low → REQ set High
REQ set High → ACK set High
ACK set High → REQ set Low
Data bus output defined → ACK set Low*
REQ set High → data bus hold time
REQ set Low → ACK set Low
tAOLR
tRAOH
tAOHR
tDVLD
tDIVD
tRAOL
Value
Min.
Max.
0
—
—
60
10
—
S•tCLF–10
—
2 tCLF
—
—
40
Unit
ns
ns
ns
ns
ns
ns
* : The value of S varies with the setting condition of the asynchronous setup time register (address 17h).
Note: This output timing regulations are not applicable when the data register is EMPTY in the data phase.
REQ
ACK
t AOLR
t RAOH
t RACY*
t AOHR
t RAOL
DB7 to 0, P
DB15 to 8, P
t DVLD
Valid data
t DIVD
t DVLD
Valid data
* : The time (tRACY) of REQ set High → ACK set Low is defined by the longer time either (tRAOH + tAOHR +tRAOL)
or (tDIVD + tDVLD).
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