MB86604L Datasheet, PDF (33/56 Pages) Fujitsu Component Limited. – SCSI-II Protocol Controller (with single-ended driver/receiver)

MB86604L
(6) SCSI interface (as initiator)
• Asynchronous transfer mode
(a) Input timing (target → initiator)
Parameter
Symbol
Base signal
Position*¹
Value
Min.
Max.
Unit
REQ “H” negate time
ACK “H” negate time
REQ “L” assert time
ACK “L”
tAKRQH
A
0
—
ns
REQ “H”
tRQAKH
B
—
60
ns
ACK “H”
tAKRQL
C
10
—
ns
Input data set up time
Input data hold time
REQ “L”
tsuDB
D
10
—
ns
REQ “L”
thDB
E
20
—
ns
ACK “L” assert time 1
REQ “L”
tRQAK1
F
—
40
ns
ACK “L” assert time 2 *²
REQ “H”
tRQAK2
G
—
3 tCLK + 40 ns
*1: The position number indicates the position in the waveform.
*2: The REQ “H” → ACK “L” time (tRQAK2) is compared with (tRQAKH + tAKRQL + tRQAK1) 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
D
t suDB
A
t AKRQH
B
t RQAKH
E
t hDB
Data
G
t RQAK2
C
t AKRQL
F
t RQAK1
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