Figure 21-7 Basic Bus Cycle: Two-State Access
T
1
T
2
t
CYC
t
CH
t
CL
t
AD
t
CF
t
CR
t
AS1
t
AS1
t
ASD
t
ACC3
t
ASD
t
ACC3
t
ACC1
t
ASD
t
AS1
t
WDD
t
WDS1
t
WSW1
t
SD
t
AH
t
PCH
t
SD
t
AH
t
PCH
t
RDH
t
RDS
t
PCH
t
SD
t
AH
t
WDH
ø
A
23
to A
0
,
CS
to
CS
AS
RD
(read)
D
15
to D
0
(read)
HWR
,
LWR
(write)
D
15
to D
0
(write)
3
0
t
cyc
693
www.DataSheet4U.com