gl846 Genesys Logic, gl846 Datasheet - Page 36

• Manufacturer Part Number: gl846
• Description: High Speed Usb 2.0 2-in-1 Scanner Controller With Fast Adf
• Manufacturer: Genesys Logic

©2000-2007 Genesys Logic Inc. - All rights reserved.
Offset 1Eh ……..……………………………………..…………..….…..………. Default value = 8’h20
Offset 1Fh ……..……………………………………..…………..….…..…….…. Default value = 8’h00
Offset 20h ……..……………………………………..…………..….…..…….…. Default value = 8’h00
Offset 21h ……..……………………………………..…………..….…..…….…. 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
STEPNO7
Note: Designers have to program the TGSHLD >= 2 (more than two).
R/W
R/W
R/W
GL846 High Speed USB2.0 2-in-1 Scanner Controller With Fast ADF
STEPNO6
BUFSEL6
R/W
R/W
R/W
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).
If VALIDWORD < buffer condition, then the scanner will re-start to scan.
64M bits SDRAM
128M bits SDRAM : 32K words
256M bits SDRAM : 64K words
512M bits SDRAM : 128K words
Following are the units of this register under various SDRAM size.
16M bits SDRAM
STEPNO5
BUFSEL5
scanning speed is improved by implementing fast motor moving.
2.it can be multiplied by2*
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
STEPNO4
R/W
R/W
R/W
: 4k words
: 16k words
STEPNO3
BUFSEL3
STEPTIM
R/W
R/W
R/W
STEPNO2
BUFSEL2
R/W
R/W
R/W
BUFSEL1
STEPNO1
R/W
R/W
R/W
STEPNO0
BUFSEL0
Page 36
R/W
R/W
R/W