GL843 GENESYS [GENESYS LOGIC], GL843 Datasheet - Page 80

• Manufacturer Part Number: GL843
• Description: High Speed USB 2.0 With ADF 2-in-1 Scanner Controller
• Manufacturer: GENESYS [GENESYS LOGIC]

GL843 High Speed USB2.0 With ADF 2-in-1 Scanner Controller For 3x
41 Lossless Data Compression
GL843 use Huffman coding method to implement the lossless data compression.
42 Lines Packing for Stagger CCD or R/G/B Line Differences
GL843 packs R, G and B lines together for CCD sensors by hardware. And it also packs the same color lines
of stagger CCD together.
43 Fine CDS Sampling Adjustment
Designers can fine-tune the CDS sampling position to avoid the digital noise influence (8.33ns adjustment).
The image noise may come from the digital noise of PCB.
44 Wall-Hitting Protection
Designers can use table five of motor moving to protect the wall hitting. The LONGCURV control bit has to
be set to logic ‘1’ to enable the long-curve function. The first several steps are used to decelerate the carriage
moving; the other slower steps are focused on touching the home sensor.
Due to the special table five, designers can replace the photo-sensor by simple, cheaper mechanical-type sensors.
45 Motor Driver IC Setting
Designers add pull up/pull down resistors on MTR_SEL1~3 will indicate ASIC to generate the timing of
specified motor driver IC. Please refer to section 5.2.
MTR_SEL1 share in CCD_CH4X pin.
MTR_SEL2 share in CCD_TGG pin.
MTR_SEL3 share in CCD_TGB pin.
46 Operation Mode Setting
Designers add pull down resistors on TSTSEL1~2 will indicate ASIC to work on normal mode.Please refer
to section 5.2.
TSTSEL1 share in CCD_CK2X pin.
TSTSEL2 share in CCD_RSX.
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