MFC2000 datasheet(401/426 Pages) ETC

401 / 426 page

Hardware Description

MFC 2000 Multifunctional Peripheral Controller 2000

100723A

Conexant

24-15

Bit 15-0

Block size in halfwords

Block size = Block Size Register + 1.

If this parameter is zero, the channel should be considered improperly

configured and not enabled. Also, no further parameters need to be

fetched in this circumstance. This register programs the data block

size (number of DMA accesses) between address steps, AST.

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Number of sub ranges (15:8)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Number of sub ranges (7:0)

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

Bit 15-0

Number of sub ranges

Total number of sub ranges = register value + 1; When this register is

set to $0000, one block will be transferred before the IRQ occurs. This

address steps that occur in the complete DMA transfer.

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Address step between sub ranges (15:8)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Address step between sub ranges (7:0)

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

Bit 15-0

Address step between sub ranges

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

BAH parameter is high. This register controls the address step size

between data blocks. The register value is added to the last DMA

address accessed in a block plus 1.

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