SCAN RESET
ENABLE
SCAN
CASCADE ENABLE A
CASCADE ENABLE B
CASCADE ENABLE C
(END OF SCAN)
DATA BYTE ON BUS
PACKAGE
1
2
3
A
4
5
1
2
3
B
4
5
1
2
3
C
4
5
FIGURE 6. TIMING DIAGRAM FOR THE 3 DRIVER CASCADE
METHOD 1
METHOD 2
INHIBIT
INHIBIT
S
R
COUNT
PULSES
(Same as input to Alt Count)
Q
TO
COUNT INPUT
D
PR
Q
TO COUNT
INPUT
C
COUNT
PULSES
(Same as input to Alt Count)
FIGURE 7. SYNCHRONIZING INHIBIT WITH COUNT PULSES FOR LS7060
INHIBIT
COUNT PULSES
(Same as input to
ALT COUNT A)
D
C
Q
TO COUNT A
COUNT PULSES
INHIBIT
Q
C*
(*Reference LS7062 Block
Diagram, Figure 9B)
NOTE: Count A may only change during positive portion of Count Pulses (Alt Count A)
when Count A is used as an inhibit.
FIGURE 8. SYNCHRONIZING INHIBIT WITH COUNT PULSES FOR COUNTER A FOR LS7062
7060/62-071398-5
LSI [ LSI COMPUTER SYSTEMS ]
