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CXD9450-24 Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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CXD9450-24 Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
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5 / 16 page  Single-Chip FaxEngine and Integrated Analog Device Single-Chip FaxEngine Product Family 100544C Conexant 5 Flash Memory Controller 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 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. As an option, plain paper inkjet printing can be supported. 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 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. 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. |
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