CX20415 View Datasheet(PDF) - Conexant Systems

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CX20415

Single-Chip FaxEngine (CXD9450) and Integrated Analog Device (CX20415)

Conexant Systems 

Single-Chip FaxEngine and Integrated Analog Device

Single-Chip FaxEngine Product Family

Flash Memory Controller

Scanner and Video Control

The CXD9450 includes a flash memory controller that

supports NOR, NAND, and Serial NAND-type flash

memory. The supported size of NOR-type memory is up

to 2 MB and the supported size of NAND-type memory is

unlimited.

Stepper Motor Control

Eight outputs are provided to external current drivers:

four to the scanner motor and four to the printer motor.

The stepping patterns are programmable and selectable

line times are supported. A timeout circuit controls the

power control of the motors. The printer or scanner

motor outputs can be programmed as GPOs for

applications using single motor or plain paper printers

T.4/T.6 Compressor/Decompressor

MH, MR, and MMR compression and decompression are

provided in hardware. T.4 line lengths of up to 2616

pixels are supported. MMR and Alternating

Compression/Decompression (ACD) on a line by line

basis provide support for up to three independent

compression and decompression processes.

Bi-level Resolution Conversion

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 circuitry.

These signals provide a per pixel period, or per line

period, timing with programmable polarity control for

each signal.

Scanner Pipeline A/D Interface

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

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

fixed to VDD. Internal +Vref is available for control by the

CPU. The internal +Vref covers the range from +2.25 V

to +2.7 V. Scanner input signal supported with full scale

is from 0.65 V P-P to 2.7 V P-P. Clamping, AGC, and

Sample/Hold circuits are built-in. The PADC data output

includes an overflow bit. The AGC gain is programmable

from 0 to 12 dB, in 1-dB steps.

One independent programmable bi-level 1D-resolution

conversion block is provided to perform expansion or

reduction on the T.4 decompressed data and scan image

data. Image expansion can be programmed up to 200%

and reduction down to 60%. Vertical line ORing and data

output bit order reversal is also provided.

Printer IF

The Printer Interface provides a standard connection

between the CXD9450 and a thermal printhead to support

thermal printing or thermal transfer. The thermal printer

interface consists of programmable data, latch, clock,

and up to four strobe signals. Programmable timing

supports traditional thermal printers, as well as the

latchless split mode printers, and line lengths of up to

2048 pixels. Line times from 5 ms to 40 ms are

supported.

The CXD9450 includes a thermal ADC (TADC) function

utilizing a D/A converter and a comparator to monitor the

printhead temperature. External terminating resistors

must be supplied; the values are determined by the

specific printhead selected.

Video Processing

The CXD9450 supports two modes of shading correction

for scanner data non-uniformity arising from uneven

sensor output or uneven illumination. Correction is

provided on either an 8-pixel group or is applied

separately to each pixel. Dark level correction and

gamma correction are also provided.

Two-dimensional Error Diffusion/Dithering is performed

on halftone images.

The CXD9450 includes an 8 x 8 dither table, which is

programmable and stored internally (8-bits per table

entry). The table is arranged in a matrix of 8 rows by 8

columns. The video processing circuit provides 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 fixed to B4-A4 conversion.

As an option, plain paper inkjet printing can be

supported.

100544C

Conexant

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