C167CS datasheet(214/517 Pages) INFINEON

214 / 517 page

C167CS

Derivatives

The External Bus Interface

User’s Manual

9-26

V2.0, 2000-07

Note: There is no register ADDRSEL0, as register BUSCON0 controls all external

accesses outside the four address windows of BUSCON4 … BUSCON1 within the

complete address space.

Definition of Address Areas

The four register pairs BUSCON4/ADDRSEL4 … BUSCON1/ADDRSEL1 allow to

define 4 separate address areas within the address space of the C167CS. Within each

of these address areas external accesses can be controlled by one of the four different

bus modes, independent of each other and of the bus mode specified in register

BUSCON0. Each ADDRSELx register in a way cuts out an address window, within which

the parameters in register BUSCONx are used to control external accesses. The range

start address of such a window defines the upper address bits, which are not used within

the address window of the specified size (see Table 9-6). For a given window size only

those upper address bits of the start address are used (marked “R”), which are not

implicitly used for addresses inside the window. The lower bits of the start address

(marked “x”) are disregarded.

Table 9-6

Address Window Definition

Bit field RGSZ Resulting Window Size

Relevant Bits (R) of Start Addr. (A12 …)

0 0 0 0

0 0 0 1

0 0 1 0

0 0 1 1

0 1 0 0

0 1 0 1

0 1 1 0

0 1 1 1

1 0 0 0

1 0 0 1

1 0 1 0

1 0 1 1

1 1 x x

4 KByte

8 KByte

16 KByte

32 KByte

64 KByte

128 KByte

256 KByte

512 KByte

1 MByte

2 MByte

4 MByte

8 MByte

Reserved.

RRR RRR RR RRR R

RRR RRR RR RRR x

RRR RRR RR RRx

RRR RRR RR Rx

RRR RRR RR x

RRR RRR Rx

RRR RRR x

RRR RRx

RRR Rx

R R R xxx

xxx

R R x

xxx

R x

xxx

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