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MFC1000

MFC1000 Controller and a Conexant MONOFAX Modem device

Conexant Systems 

 

Printer Stepper Motor Control

Vertical printer motor control lines consist of four

pins PM[3:0]/GPO[3:0] designed to control vertical

printer motor movement through external current

drivers or to serve as GPO. The vertical printer

stepper motor output is controlled using a

programmable pulse width generator. Therefore,

acceleration/deceleration and constant speed motor

control are supported. The CPU only needs to

change the timer value when the motor speed needs

to be changed. The vertical motor can run at

constant speed, increasing speed, or decreasing

speed.

T.4/T.6 Compressor/Decompressor

MH, MR, and MMR compression and

decompression are provided in hardware.

Alternating Compression and Decompression (ACD)

on a line by line basis provides support for up to

three independent compression/decompression

processes. T.4 line lengths up to 8192 pixels are

supported.

Bi-level Resolution Conversion

One independent programmable bi-level 1-D

resolution conversion block is provided to perform

expansion or reduction on the T4 decompressed

data and host image data. Image expansion can be

programmed up to 360% and reduction down to

33%. Vertical line ORing, shingling function and

horizontal shifting function for inkjet printing and the

vertical line filtered are also provided.

External Printer IF

The External Printer Interface provides a connection

between the MFC1000 and the external printer ASIC

(inkjet or laser). The MFC1000 configures and

controls the external printer ASIC by setting registers

in it through system bus.

The interface includes AUXCLK, which can be used

as a clock base for the external print ASIC, an

interrupt (PRTIRQn), DMA, (DMARQ and

DMAACK), and system bus signals.

External Scanner IF

The interface between MFC1000 and the External

image processing ASIC is called the External

Scanner IF. It includes clock (AUXCLK), DMA

(DMAREQ0 and DMAACK0), and system bus

signals.

6

Scanner and Video Control

Six programmable control and timing signals support

common CCD and CIS scanners. The video control

function provides signals for controlling the scanner

and for processing its video output. Four

programmable control signals (START, CLK1,

CLK1n, and CLK2) provide timing related to line and

pixel timing. These are programmable with regard to

start time, relative delay and pulse width. Two video

control output signals (VIDCTL[1:0]) provide digital

control for external signal pre-processing or test

circuitry. These signals provide a per pixel period, or

per line period, timing; with programmable positive-

going and negative-going transitions for each period.

Scanner line lengths up to 4096 pixels are

supported.

Scanner Pipeline A/D Interface

An internal 8-bit Pipeline A/D converter (PADC) is

provided. The A/D reference input (Vref+) is made

available for control by external circuits. The

clamping, AGC, and Sample/Hold circuits are also

built-in. The PADC data output includes overflow

and underflow bits.

Video Processing

Line-based Dark Level Correction Logic

compensates for the variations of the image output

voltage caused by DC offset. The MFC1000

supports two modes of shading correction: for

scanner data non-uniformities arising from uneven

sensor output or uneven illumination.

Correction is provided on either an 8-pixel group or

is applied separately to each pixel. Gamma

correction is also provided. Automatic Background

Correction (ABC), Dynamic Foreground Correction

(DFC), and 2-D Edge enhancement/MTF are

provided for text images. 2-D Edge en-

hancement/MTF and 2-D Error Diffusion/Dithering

are performed on halftone images. The MFC1000

includes a 16 x 16 dither table, which is

programmable and stored internally (8-bits per table

entry). The table is arranged in a matrix of up to 16

rows by up to 16 columns. The video processing

circuit also provides the mixed-mode

detection/processing and multi-level Resolution

Conversion for the scanner multi-level data. The

conversion ratio of the multi-level Resolution

Conversion is from 360% to 50%.

Bit Rotation

This block performs 90 degree data rotation on the

horizontal shifted print data in the printing swatch

buffer to support mono and color inkjet printing. It is

designed to prepare the printing data from the line-

based mono or color image data for each color plane

in the line buffer into a form ready for each fire cycle

of the inkjet printer. The ready form of data for the

fire cycle of the print engine means that data are bit-

rotated and interleaved in the bit order for each fire

cycle.

MD192

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