Zenith Z-100 PC series Service Manual page 94

Page
4-8
Detailed Circuit Description
r125ns~
8MHz
SO*-S2*---'~
__________
~
________________________
- - J
MW* ______________
~I~~~:ons
I~
70ns
OO-07--------------~----~~1
l .
L--­
l~r5~0~n~S----------------------------------~~.,20nS
GCPU------------~--~I ~
GM*
I~
30ns
I
I I
RAS* ______________
~~10~n-S------------------------------~I~~2~OnS
I , - ­
1~70ns
I
r-
I~
5i-0.;...;.nS.;.....___________
I~._,3
0 n s
MAO-MA8----~~1
IL-________________________________
~r____
h .. 20ns
oT/R*----.....J'
5MHz
so S2
I~
40ns
h
40ns
*- *
--,l..____________-:-:-___________
~I
I 1'20ns
MW* ______________ ~~20ns 4~~~----
. . . I--------------------~,
1~110ns
00-07
I
~80ns
GCPU
I
1
"30
I"
30ns
GM*--------------~~~
ns
~
...
I------------------~I
RAS* ______________
~1~10nS 1~~1~0~n~s
____
I I
CAS* ______________________ ~--~1~10ns
I
~I--------~----~~~
I~
50ns
~ 110ns 1~;-l.;..10.;..n.;..S~ ___
I------_----_------~I MAO-MA8---~1
...
NOTE:
MW at RAM
Figure 4-3: Memory Write Timing