Control Data 1700 Maintenance Manual page 75

q I
~<
~I
Timing
3.5 msec
H
Pulse
I
I
I
~
I
24
- I
I
FF
Ale
I
~
f'
~ usec
I
I
I
I
I
I
FF
BID
I
S
~
I
I
I
~tO ~
>;(
t2
~
t3
,....
tIt
J ( - -
to
~
I I
I
to time between trailing edge of one clock pulse
&
leading edge of
another clock pulse (approx. 3.5 msec)
tl - 4 usec
t2 20 usec
t3 time between end of t2 and trailing edge of clock pulse (approx.
3.25 msec)
Figure 5-1
Card Reader Timing Chain
Table 5-3 gives events accomplished during a timing chain cycle.
Time
Operation
tl
Clear Data Register (page 45)
t2
transfer data from read station to Data Register
t3
(only first 100 nsec used) set Data FF (page 41)
to
Enable recycling timing chain
Table 5-3
Card Reader Timing Chain Cycle
At this point in time, column 1 of the card is over the read station, the
information from that column has transferred to the Data Register, Card motion
5-4