Avago Technologies LSI53C120 - Manual (Page 46)

3-16 Specifications
Figure 3.8 Clock Timing
3.2.3.1 SCSI Interface Timing
Table 3.19 shows the SCSI interface input timing, Table 3.20 shows the
SCSI interface output timing, and Figure 3.9 on page 3-17 shows the
input/output timing diagram.
CLOCK
t
1
t
3
t
4
t
2
Table 3.19 Input Timing
Symbol Parameter Min Max Units
t
1
Input data setup 1 - ns
t
2
Input data hold 6 - ns
t
3
Input REQ/ACK assertion pulse width 11 - ns
t
4
Input REQ/ACK deassertion pulse width 16 - ns
Table 3.20 Output Timing
Symbol Parameter Min Max Units
t
5
Output data setup min [t
1
+ 17ns, t
4
+5] – ns
t
6
Output data hold max [24, (t
2
- 20), t
3
] – ns
t
7
Output REQ/ACK pulse width max [20 ns, t
3
-5] max [30 ns, t
3
+5] ns
t
8
REQ/ACK transport delay 25 ns if REQ/ACK is
clock for input data,
10 ns if not 50 ns if REQ/ACK is clock
for input data, 30 ns if not ns
t
9
Data transport delay 6 [t
3
+35] ns