Z8S180 Zilog., Z8S180 Datasheet - Page 71

• Manufacturer Part Number: Z8S180
• Description: ENHANCED Z180 MICROPROCESSOR
• Manufacturer: Zilog.

56
UM005001-ZMP0400
Z 8018x Fam il y
M PU Us e r M anual
0000H
FFFFH
Figure 24.
MMU Block Diagram
The MMU block diagram is depicted in Figure 25. The MMU translates
internal 16-bit logical addresses to external 20-bit physical addresses.
Figure 25.
MMU Common/Bank Area
Common Area 0
Common Area 1
Register; CBAR (8)
Bank Area
Logical Address Space
Physical Address Transition
MMU Block Diagram
x y z
+
+
+
Common Base
Internal Address/Data Bus
Bank Base
Management
0
Memory
Unit
4
LA12— LA15
PA12— PA19
8
Physical Address Space
MMU Common Base
Register; CBR (8)
MMU Bank Base
Register; BBR (8)
LA: Logical Address
PA: Physical Address
z
y
x
FFFFFH
00000H