MAC7200 datasheet(423/976 Pages) FREESCALE

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Chip-Select Operation

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

345

17.3.2.1

Chip-Select Address Registers (CSAR0–CSAR2)

CSARn, Figure 17-2, specify the chip-select base addresses.

17.3.2.2

Chip-Select Mask Registers (CSMR0–CSMR2)

CSMRn, Figure 17-2, are used to specify the address mask and allowable access types for the respective

chip-selects.

RBA

Reset

000

0000

000

Reg

Addr

MBAR + 0x00 (CSAR0); 0x0C (CSAR1); 0x18 (CSAR2)

9876

543

210

000

0000

000

Reset

000

0000

000

Reg

Addr

MBAR + 0x00 (CSAR0); 0x0C (CSAR1); 0x18 (CSAR2)

Figure 17-2. Chip-Select Address Registers (CSARn)

Table 17-5. CSARn Field Descriptions

Bits

Name

Description

31–16

Base address. Defines the base address for memory dedicated to chip-select CSn. BA is

compared to bits 31–16 on the internal address bus to determine if chip-select memory is

being accessed.

15–0

—

Reserved, should be cleared

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