MFC2000 datasheet(122/426 Pages) ETC

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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

4-92

Conexant

100723A

Address:ch9csbs

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Default:

DMA9 Transfer

Block Size Reg.

(DMA9BlockSize)

$xx81BF

Channel 9

Enable = 1

Not Used

Upper four bits of the Block Size counter

Rst. Value

00h

Read

Value 00h

Address:ch9csbs

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default:

DMA9Transfer

Block Size Reg.

(DMA9BlockSize)

$xx81BE

Low Byte Value for the Bi-level resolution conversion logic Block Size Counter

Rst. Value

00h

Read Value

00h

•

DMA Channel 9 Block Size Limit Counter

•

block size of DMA channel 9 (bytes)

− Unlimited block size (block size =

∞ ):

bit[11:0] of the DMA9BlockSize register = 000h

Limited block size (block size = 1 - 4095)

•

The Block Size counter will decrement regardless of the DMA Address counter’s activity. The block size

•

Writing to this register will also clear the bi-level resolution conversion interrupt.

Bit 15:

Channel 9 Enable is cleared when the block size limit is reached, and must be set, (enabled) after a

new block size is entered. The new block size can only be written

when this bit is 0.

Address:

Bit 15

Bit 14

Bit 13

Bit 12

Bit 11

Bit 10

Bit 9

Bit 8

Default:

DMA6/10 Throttle

(DMA6/10Throttle)

$01FF81BD

Throttle Ch.

Select

0= Ch. 6

1= Ch. 10

Throttle

Value

bit 14

Throttle

Value

bit 13

Throttle

Value

bit 12

Throttle

Value

bit 11

Throttle

Value

bit 10

Throttle

Value

bit 9

Throttle

Value

bit 8

Rst. Value

00h

Read

Value 00h

Address:

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default:

DMA6/10 Throttle

(DMA6/10Throttle)

$01FF81BC

Throttle

Value

bit 7

Throttle

Value

bit 6

Throttle

Value

bit 5

Throttle

Value

bit 4

Throttle

Value

bit 3

Throttle

Value

bit 2

Throttle

Value

bit 1

Throttle

Value

bit 0

Rst. Value

00h

Read

Value 00h

•

Throttle Value (TV) = 1-32767 (TV= 0; disables Throttle Function)

Throttle Value (TV) allows 1 DMA access every “TV*SIUCLK” time period.

•

DMA Channel 6 OR 10 Throttle Control: This register is loadable while the DMA is active. Write to this register

will reset the throttle timer.

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