GL843 GENESYS [GENESYS LOGIC], GL843 Datasheet - Page 32

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

©2000-2006 Genesys Logic Inc. - All rights reserved.
Offset 1Dh ……..……………………………………..…………..….…..………. Default value = 8’h04
Offset 1Eh ……..……………………………………..…………..….…..………. Default value = 8’h20
Offset 1Fh ……..……………………………………..…………..….…..…….…. Default value = 8’h00
Offset 20h ……..……………………………………..…………..….…..…….…. Default value = 8’h00
SCANFED7 SCANFED6 SCANFED5 SCANFED4 SCANFED3 SCANFED2 SCANFED1 SCANFED0
4-0 TGSHLD[4:0] CCD TG shoulder width (in pixel time). Please refer to Reg34.
7-4 WDTIME[3:0] To set watch-dog time.
3-0 LINESEL[3:0] To set vertical resolution for CIS or dummy lines for CCD.
7-0 SCANFED[7:0] Steps number setting for moving to scanning position.
7-0 BUFSEL[7:0]
WDTIME3 WDTIME2 WDTIME1 WDTIME0 LINESEL3 LINESEL2 LINESEL1 LINESEL0
BUFSEL7
CK4LOW
7 CK4LOW
6 CK3LOW
5 CK1LOW
Note: Designers have to program the TGSHLD >= 2 (more than two).
R/W
R/W
R/W
R/W
GL843 High Speed USB2.0 With ADF 2-in-1 Scanner Controller For 3x
CK3LOW
BUFSEL6
R/W
R/W
R/W
R/W
0 Clock 4 will be high when TG goes high.
1 Clock 4 will be low when TG goes high.
0 Clock 3 will be high when TG goes high.
1 Clock 3 will be low when TG goes high.
0 Clock 1 & 2 will be high when TG goes high.
1 Clock 1 & 2 will be low when TG goes high.
The unit is 30 seconds.
CIS : LINESEL = 0 full resolution.
CCD : LINESEL = 0 no dummy line.
Note: In contrary to dummy line feature in CCD, for low resolution in CIS, the
Please refer to description of Reg6A
Note: 1.it cannot be programmed to logic zero.
To set buffer condition.
When buffer is full, scanner will stop and wait for host to read out image data
from SDRAM.
The valid data count (has not been read) is represented by VALIDWORD (in word).
CK1LOW TGSHLD4 TGSHLD3 TGSHLD2 TGSHLD1 TGSHLD0
BUFSEL5
scanning speed is improved by implementing fast motor moving.
2.it can be multiplied by2*
R/W
R/W
R/W
R/W
= 1 1/2 resolution.
= 2 1/3 resolution .
…..
= 15 1/16 resolution.
= 1 1 dummy line.
= 2 2 dummy lines.
…..
= 15 15 dummy lines.
BUFSEL4
R/W
R/W
R/W
R/W
BUFSEL3
STEPTIM
R/W
R/W
R/W
R/W
BUFSEL2
R/W
R/W
R/W
R/W
BUFSEL1
R/W
R/W
R/W
R/W
BUFSEL0
Page 32
R/W
R/W
R/W
R/W