GL843 datasheet(24/84 Pages) GENESYS

24 / 84 page

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

Page 24

Line art scanning : 1 bit image with gamma correction

111

16 clocks/pixel.

Color scanning : 24 bits image with gamma correction

48 bits image without gamma correction

Gray scanning : 8 bits image with gamma correction

16 bits image without gamma correction

Line art scanning : 1 bit image with gamma correction

4 PWRBIT

The hardware will reset this bit during power-on initial process. It can be set and

checked by S/W to know if the power had been turned off or not.

Default is reset.

3 GAIN4

Digital shading gain=8 times system.

Digital shading gain=4 times system.

Note: If you want to get more precise image quality,you can set GAIN4 bit.

2-0 OPTEST[2:0]

Select ASIC operation type.

000

Set normal mode to capture AFE image.

001

Set SDRAM bank testing and power-on moving testing for ASIC simulation

010

Pixel count pattern for ASIC image test.

011

Line count pattern for ASIC image test.

100

Counter and adder test for ASIC simulation test.

101

Reserved.

110

Reserved.

111

Reserved.

Offset 07h ……………………………………………..…………..……..………. Default value = 8’h00

LAMPSIM

CCDCTL

DRAMCTL

MOVCTL

RAMSEL

FASTDMA

DMASEL

DMARDWR

R/W

LAMPSIM

for timer simulation

CCDCTL

for CCD timing control

DRAMCTL

for SRAM & DRAM access control

MOVCTL

for motor driver IC style control

SRAMSEL

DMA access for DRAM.

DMA access for SRA

FASTDMA

4clocks/access,that is to say 4clocks/16bits or 4clocks/8bits for

DMA access.

2clocks/access,that is to say 2clocks/16bits or 2clocks/8bits for

DMA access.

DMASEL

MPU access DRAM under command mode.

DMA access DRAM under command mode.

DMARDWR

DMA read DRAM under command mode.

Note: Please do not write other values than 00H into this register under normal condition.

Offset 08h ……………………………………………..…………..……..………. Default value = 8’h00

DECFLAG

GMMFFR

GMMFFG

GMMFFB

GMMZR

GMMZG

GMMZB

R/W

7 RESERVED

6 DECFLAG

Select gamma table in increment type

Select gamma table in decrement type.

5 GMMFFR

This function is not enabled

Gamma table address FFH of red channel is a special value.

GL843 Datasheet(PDF) 24 Page - GENESYS LOGIC

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