MB86604L Datasheet, PDF (37/56 Pages) Fujitsu Component Limited. – SCSI-II Protocol Controller (with single-ended driver/receiver)

MB86604L
(7) SCSI interface (as initiator)
• Asynchronous transfer mode
(a) Input timing (initiator → target)
Parameter
Symbol
Base signal
Position*¹
Value
Min.
Max.
Unit
ACK “L” assert time
REQ “H” negate time
ACK “H” negate time
REQ “L”
tRQAKL
A
0
—
ns
ACK “L”
tAKRQH
B
—
60
ns
REQ “H”
tRQAKH
C
0
—
ns
Input data set up time
Input data hold time
ACK “L”
tsuDB
D
10
—
ns
ACK “L”
thDB
E
20
—
ns
ACK “L” assert time 1
ACK “H”
tAKRQ1
F
—
40
ns
ACK “L” assert time 2 *²
ACK “H”
tALRQ2
G
—
3 tCLK + 40 ns
*1: The position number indicates the position in the waveform.
*2: The REQ “L” → REQ “L” time (tAKRQ2) is compared with (tAKRQH + tRQAKH + tAKRQ1) and the longer value is chosen.
Note: The input timing definition is not applied in the following cases.
• When the data register is FULL in the data phase
• When the final byte is being transferred
REQ
ACK
DB7 to DB0
DBP
G
t AKRQ2
A
t RQAKL
B
t AKRQH
C
t RQAKH
F
t AKRQ1
D
t suDB
E
t hDB
Data
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