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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

11-12

Conexant

100723A

Data Buffers Dynamically

Allocated by CPU

Two buffers prepared in

background by CPU

Color 3, Buffer 0, lines 0

to NG

Color 2, Buffer 0

Lines NG-VP+1 to NG

Color 2, Buffer 1

Lines 0 to NG-VP

lines 0 to (2*VP) - 1 are

zero-filled.

Color 1, Buffer 0, lines 0

to NG - (2*VP) .

Color 3, Buffer 1, lines 0

to NG

Color 2, Buffer 1, lines

NG - (VP+1) to NG.

Color 2, Buffer 2, lines 0

to NG-VP.

Color 1, Buffer 0, lines

NG - (2*VP) + 1 to NG.

Color 1, Buffer 1, lines 0

to NG - (2*VP) .

Note: This example shows what

these buffers should look like if

printing swaths 3 and 4 starting

with swath 1.

Note: NG is one less than the

physical number of nozzles in

the color group. VP is the

vertical distance between

nozzle groups

Color1, Buffer 3

Color1, Buffer 2

Color1, Buffer 1

Color1, Buffer 0

Color 2, Buffer 2

Color2, Buffer 1

Color2, Buffer 0

Color3, Buffer 0

Color3, Buffer 1

Note: Each Buffer is NG Lines deep

for

swath 3

for

swath 4

Figure 11-6. CPU Background Print Data Preparation

During black-only printing, the two buffers that are prepared for color printing simply become the two buffers that

are used for the black-only print mode. Each of these buffers will contain as many lines as there are nozzles on

the printhead.

Image Format

The data that is presented to the Bit Rotation Block is always in little-endian format. The data within the system is

in 2 separate formats: big-endian and little-endian. However, if the data in image memory is in big-endian format,

then the SIU will translate that data to a little-endian format during the DMA operation with the endian conversion

bit enabled, to ensure that the Bit Rotation Block only needs to deal with little-endian formatted data. The little

endian format that the Bit Rotation Block expects to see is shown in the following illustration:

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