GL848 datasheet(24/85 Pages) GENESYS

24 / 85 page

GL848 High Speed USB2.0 2-in-1 Scanner Controller With Fast ADF

Page 24

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

RESERVE6 RESERVE5 RESERVE4 RESERVE3 RESERVE2 RESERVE1 RESERVE0

R/W

LAMPSIM

for timer simulation

6-0

RESERVE [6:0]

These bits are reserved for special application

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

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

DRAM2X SCNUMENB

MPENB

CIS_LINE

ENB24M

R/W

7 DRAM2X

Select single chip of SDRAM

Enable two chips of SDRAM

6 SCNUMENB

Enable page count which is stored in memory for ADF operation

5 MPENB

Enable motor phase generating function which is stored in memory

4 CIS_LINE

Set CIS_LINE to “1” and set CISSET to “1” at the same time to enable CIS

scanning, and work on line by line mode.

0 ENB24M

Disable 24MHz CCD/CIS Clock output

Enable 24MHz CCD/CIS Clock output

Offset 09h ……………………………………………..…………..……..………. Default value = 8’h00

MCNTSET1 MCNTSET0

EVEN1ST BLINE1ST BACKSCAN

SHORTTG

R/W

7-6 MCNTSET [1:0] To select the unit of motor table counter.

Pixel count.

System clock*2.

System clock*3.

GL848 Datasheet(PDF) 24 Page - GENESYS LOGIC

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