MFC2000 datasheet(400/426 Pages) ETC

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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

24-14

Conexant

100723A

The meaning of the ENB, BAH, BAL, SZ, NSR, and AST parameters are shown below:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Not used

Program

/Data

Logical Data Channel

Number

Address

direction

Data

direction

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Not used

Base address (21:16)

Parameter Description: BAH parameter

Bit 15-13

Not used

Bit 12

When high, logical channel 4 is requested (program DMA.) When low,

one of logical channels 0-3 is requested as specified by the Logical

Channel Number field (data DMA.)

Bit 11-10 Logical Data Channel Number

When bit 12 is low, this field indicates which logical channel of 0-3 is to

be used (data DMA.) When bit 12 is high, this field is not used.

Bit 9

Address direction

When low, the DMA address should be incremented after each

halfword is transferred. When high, the DMA address should be

decremented after each halfword is transferred.

Bit 8

Data direction

When low, DMA data is read from Countach scratch pad space. When

high, DMA data is written to Countach scratch pad space.

Bit 7-6

Not used

Bit 5-0

Upper bits of DMA base address

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Base address (15:8)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Base address (7:0)

Parameter Description: BAL parameter

Bit 15-8

Lower bits of DMA base address

This parameter should only be fetched if the Enable channel bit of the

BAH parameter is high.

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Block size (15:8)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Block size (7:0)

Parameter Description: SZ parameter (Refer to the above diagram)

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