Timing Chart - Tandy WP-2 Service Manual

WRITE CYCLE
(/CE1
CONTROLLED
WRITE)
ADDRESS
R/W
CE2
CE1
DOUT
Din
zx
twc
.1*3
^^M
WMM/
w
tcoe
twp
///////////////////,
tew
toDW
fwR
-
ywm,
/
X
tos
s
DATA
IN
STABLE
tDH
K
Figure
4-17.
Timing Chart
NOTE:
1.
R/W
is
for
Read
cycle.
2.
Assuming
that
/CEI
Low
transition or
CE2
High
transition occurs coincident with or
after
R/W
Low
transition,
output remains
in
a
high-impedance
state.
3.
Assuming
that
/CEI
High
transition
or
CE2 Low
transition occurs coincident with or
prior to
R/W
High
transition,
output remains
in
a high-impedance
state.
4.
Assuming
that
/OE
is
high
for
Write
cycle,
output
is
in a
high-impedance
state during
this period.
4-24