IBM 7090 - Page 26

(1)
Input
-0
+TO
(3)
Set
I
i I I i
I
I
I I
i I
i
I
i
I
lL
'i I-
i
I
I
I
!
I
I
I
I
9-+-
I
i
I
I
Hold
Input
2)
I
+TA
3)
I
(4)
+TO
5
I
i
I
4)
I
lit
i
I
i
I
I
i
5)
I
• ! 'I
, LL _____
-
~t-
-'1-~ .
I
i '
6)
! I
I
II
I
I
I
I
I
I
Set
Each Divi sion Equal s 20 Nanoseconds
-A
Hold
Output
FIGURE 3.1-2. SHIFT CELL
Reset
Count
Count
Count Caunt
=0
= 1
= 2
=3
(X = On; 0 = Off)
High Order
0
0
0 0
Low Order o
X
o X
Input
1st Pulse
2nd Pulse 3rd Pulse
FIGURE
3.1-3. COUNT-UP COUNTER
25