MC68340 datasheet(117/441 Pages) FREESCALE

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MC68340 USER’S MANUAL

MOTOROLA

4.3.1 Module Base Address Register (MBAR)

MBAR 1

$0003FF00

BA31

BA30

BA29

BA28

BA27

BA26

BA25

BA24

BA23

BA22

BA21

BA20

BA19

IBA18

BA17

BA16

RESET:

0000000000000000

CPU Space Only

MBAR 2

$0003FF02

9876543210

BA15

BA14

BA13

BA12

AS8

AS7

AS6

AS5

AS4

AS3

AS2

AS1

AS0

RESET

0000000000000000

CPU Space Only

BA31–BA12—Base Address Bits 31–12

The base address field is the upper 20 bits of the MBAR that provides for block starting

locations in increments of 4-Kbytes.

Bits 11, 10—Reserved

AS8–AS0—Address Space Bits 8–0

The address space field allows particular address spaces to be masked, placing the 4K

module block into a particular address space(s). If an address space is masked, an

access to the register block location in that address space becomes an external access.

The module block is not accessed. The address space bits are as follows:

AS8—mask DMA Space

address space (FC3–FC0 = 1xxx)

AS7—mask CPU Space

address space (FC3–FC0 = 0111)

AS6—mask Supervisor Program

address space (FC3–FC0 = 0110)

AS5—mask Supervisor Data

address space (FC3–FC0 = 0101)

AS4—mask Reserved [Motorola]

address space (FC3–FC0 = 0100)

AS3—mask Reserved [User]

address space (FC3–FC0 = 0011)

AS2—mask User Program

address space (FC3–FC0 = 0010)

AS1—mask User Data

address space (FC3–FC0 = 0001)

AS0—mask Reserved [Motorola]

address space (FC3–FC0 = 0000)

For each address space bit:

1 = Mask this address space from the internal module selection. The bus cycle goes

external.

0 = Decode for the internal module block.

V—Valid Bit

This bit indicates when the contents of the MBAR are valid. The base address value is

not used; therefore, all internal module registers are not accessible until the V-bit is set.

1 = Contents are valid.

0 = Contents are not valid.

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