z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 71

• Manufacturer Part Number: z80189
• Description: Z80180, Z8s180, Z8l180 Mpu Operation
• Manufacturer: ZiLOG Semiconductor

56
UM005003-0703
Z8018x
Family MPU User Manual
0000H
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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
LA12—LA15
4
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
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