845
PBR
Internal
data bus
RES
A19–A21
PFC
SBYCR
BSC/AD
BREQ, WAIT,
ADTRG
Standby
Bus right
release
PBW
n = 7-9
m = 5-7
PBR: Port B read signal
PBW: Port B write signal
RES: Reset signal
PBnDR
Q
C
D
Q PBnMD0
Q PBnMD1
Q HIZ
Q PBnIOR
INTC
IRQm
PBn/
IRQm/
XXX/
YYY
Figure B.20 PBn/IRQm/XXX/YYY Block Diagram
