z80180 ZiLOG Semiconductor, z80180 Datasheet - Page 77

• Manufacturer Part Number: z80180
• Description: Microprocessor Unit
• Manufacturer: ZiLOG Semiconductor

MMU Common Base Register
MMU Bank Base Register (BBR: I/O Address = 39h)
MMU Bank Base Register (BBR)
MMU Bank Base Register (BBR: I/O Address = 39h)
PS014004-1106
Bit
Bit
CB7
R/W
BB7
R/W
7
4. The refresh address is incremented by one for each successful refresh cycle, not for each
Mnemonic CBR
Address 38
MMU Common Base Register (CBR)—
boundaries) used to generate a 20-bit physical address for Common Area 1 accesses. All bits
of
Mnemonic BBR
Address 39
BBR
address for Bank Area accesses. All bits of
7
CBR
refresh. Independent of the number of missed refresh requests, each refresh bus cycle
uses a refresh address incremented by one from that of the previous refresh bus cycles.
Figure 73. MMU Bank Base Register (BBR: I/O Address = 39h)
Figure 74. MMU Bank Base Register (BBR: I/O Address = 39h)
specifies the base address (on 4-KB boundaries) used to generate a 19-bit physical
R/W
CB6
are reset to
R/W
6
BB6
6
R/W
CB5
R/W
BB5
5
5
0
during
CB4
R/W
BB4
R/W
4
RESET
4
R/W
CB3
.
R/W
3
BB3
3
BBR
R/W
CB2
CBR
R/W
2
BB2
2
are reset to
specifies the base address (on 4-KB
R/W
CB1
R/W
1
BB1
1
0
during
R/W
CB0
R/W
0
BB0
0
Microprocessor Unit
RESET
.
Architecture
Z80180
71