GL843 datasheet(80/84 Pages) GENESYS

80 / 84 page

GL843 High Speed USB2.0 With ADF 2-in-1 Scanner Controller For 3x

Page 80

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.

GL843 Datasheet(PDF) 80 Page - GENESYS LOGIC