
835
PAR
Internal
data bus
RES
DRAK1
BACK
PFC
Standby
Bus right
release
PAW
SBYCR
PAR: Port A read signal
PAW: Port A write signal
RES: Reset signal
PA19DR
Q
C
D
R
Q HIZ
PA19/
DRAK1/
BACK
Q PA19MD0
Q PA19MD1
Q PA19IOR
Figure B.10 PA19/DRAQ1/BACK Block Diagram