Zenith Z-100 PC series Service Manual page 93

Page
4-7
Detailed Circuit Description
r-125ns - ,
8MHz
r !
T1
r-1
T2
r-1
T3
r-l
TW
r-l
T4 r l L____........
r -l
so*-s2*---,L__________
~----------------------~'~---Jions
___ L ­
MR* _ _ _ _ _ _ _ _
....J:,,1~10ns 1~40ns
LI_______________ ~~~----------~I
1~30ns
DO-D7--------------~~----~1
I
1~20nS ~50ns
GCPU--------------~--------JI LI~~------
GM* ______________
~I~~30ns 1~70ns
I~------------------------~~~I
RAS* ____________....J::,1.:.&10nS
1~50ns
_ _ _ _ _ _ _ _
~------------------------J'
L '
1~70nS 1~;..7;;.O;.;.nS~----
CAS*
I I
1-~~4~O-nS-----------~I~~30ns L-------------------~1~30nS
MAO-MA8------
J
I
IL-_______________
-J'
DT/R*--------------------________________________________________________
, 2 1 0 n s - j
5MHz
T1
1~40ns 1~40nS
SO*-S2*--,L_______________________
--J 1
MR*--------~
_ _ _ _ _ _ _ _ _ _ _
~~~1~5rO~n_s---~~-~----~I~_,40ns
DO-D7
1"10ns~1 I~
80ns
L ­
GCPU--------------~------~I IL_____________________
GM* _____________
......:I-.I.~3
Ons
I~1;.::0;.::O~n.::.s
______
,L-________________
~--~,
R A S* _____________
~I~
1 0 n s
I
~8r-0::.:n~s::.._
_________________
L '_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
--J'
CAS* - - - - - - - - - - - - - - - - - - - - -..... , ,
I
50 n s ,------,. 1 10 n S
L -__________
,....I------
,1,.-1""' o ,...n-s . ........
----?I I -,.
. I
MAO-MA8
DT/R* ___________________________________________________________________
Figure 4-2: Memory Read Timing