Zilog Z80180 Manual do Utilizador descarregar pdf (Página 73)

Z8018x

Family MPU User Manual

UM005003-0703

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MMU Common/Bank Area Register (CBAR)

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MMU Common Base Register (CBR)

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MMU Bank Base Register (BBR)

CBAR is used to define the logical memory organization, while CBR and

BBR are used to relocate logical areas within the 1024KB physical

address space. The resolution for both setting boundaries within the

logical space and relocation within the physical space is 4KB.

The CA field of CBAR determines the start address of Common Area 1

(Upper Common) and by default, the end address of the Bank Area. The

BA field determines the start address of the Bank Area and by default, the

end address of Common Area 0 (Lower Common).

The CA and BA fields of CBAR may be freely programmed subject only

to the restriction that CA may never be less than BA. Figures 27 and 28

illustrate examples of logical memory organizations associated with

different values of CA and BA.

Figure 27. Logical Memory Organization

Common

Bank Area

Common

Bank Area

Common

Common Area 1

Lower Limit Address

Bank Area

Lower Limit Address

0000H

Common Area 1

Lower lImit Address

Bank Area

Lower lImit Address

0000H

Common Area 1

Lower Limit Address

Bank Area

Lower Limit Address

0000H

Common Area 1

Lower Limit Address

Bank Area

Lower Limit Address

0000H

(RESET Condition)

Area 1

Area 0

Area 1

Area 0

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 325 326

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