SAA7385 Datasheet, PDF (52/64 Pages) NXP Semiconductors – Error correction and host interface IC for CD-ROM SEQUOIA

Philips Semiconductors
Error correction and host interface IC for
CD-ROM (SEQUOIA)
Preliminary specification
SAA7385
15.6 SCSI interface timing
V_DD = 4.75 to 5.25 V; V_SS = 0 V; T_amb = −10 to +70 °C; unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
Target asynchronous send; see Fig.19
t₁
Data set-up time to REQ LOW
60
t₂
ACK LOW to REQ HIGH
−
t₃
Data hold time from ACK LOW
FIFO not empty
5
t₄
ACK HIGH to REQ LOW
data already set-up −
Target asynchronous receive; see Fig.20
t₁
ACK LOW to REQ HIGH
−
t₂
ACK HIGH to REQ LOW
FIFO not full
−
t₃
Data set-up time to ACK LOW
0
t₄
Data hold time from REQ HIGH
0
Fast SCSI-2 single-ended transfers (10 Mbytes/s)
TARGET SYNCHRONOUS OUTPUT; see Fig.21
t₁
REQ or ACK assertion period
35
t₂
REQ or ACK negation period
35
t₃
Data set-up time to REQ or ACK LOW
33
t₄
Data hold time from ACK or REQ LOW
45
TARGET SYNCHRONOUS INPUT; see Fig.22
t₁
REQ or ACK assertion period
20
t₂
REQ or ACK negation period
20
t₃
Data set-up time to REQ or ACK LOW
0
t₄
Data hold time from ACK or REQ LOW
10
MAX.
−
40
−
40
40
40
−
−
−
−
−
−
−
−
−
−
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
handbook, full pagewidth _{SD7 to SD0}
t1
REQ
ACK
t3
t2
t4
MGE407
1996 Jun 19
Fig.19 Target asynchronous send signal transitions.
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