gl846 Genesys Logic, gl846 Datasheet - Page 82

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

CHAPTER 6 FUNCTIONAL DESCRIPTION
1 System Clock
Internal PLL.
A. Input: 12MHz crystal.
B. Output: 12, 24, 30, 40, 48 or 60 MHz to scanner controller system.
2 Pixel Clock
A. Normal mode
B. fast mode
C. Scan mode 7
D. Scan mode 6
Note: Chunky Color is R1G1B1, R2G2B2, R3G3B3,………(three-line-in or pixel rate).
3 Scan Speed
A. System clock = 30MHz:
B. System clock = 40MHz:
4 Fast Scan for Low Resolutions
Designers are allowed to increase CCD clock rates to up scanning speed in low resolutions,
such as 2, 4, 8, …times..
5 Scanning Type
GL846 supports three-line-in (parallel) for CCD and one-line-in for CIS.
A. CCD Type
©2000-2007 Genesys Logic Inc. - All rights reserved.
Scan mode 0:
Scan mode 2:
CCD Exposure control:
There are three modes to control CCD TG by TGMODE control bits.
Planar Color is R1, R2, R3,…..; G1, G2, G3,…….; B1, B2, B3,……..(one-line-in or line rate).
CCD: Chunky color or planar color.
CIS: Planar color.
a. Normal Mode: Chunky color, fine gray or fine line art scan.
a. Normal Mode: Chunky color, fine gray or fine line art scan.
(scan mode 0) 12x33.333ns/pixel = 0.4us/pixel.
GL846 High Speed USB2.0 2-in-1 Scanner Controller With Fast ADF
(1). 600dpi: 2.160ms/line, 15.163s/page.
(2). 1200dpi: 4.320ms/line, 60.653s/page.
12x25ns/pixel = 0.3us/pixel
(1). 600dpi: 1.620ms/line, 11.372s/page.
(2). 1200dpi: 3.240ms/line, 45.488s/page.
a. 12 system clock/pixel.
b. Chunky color (three line in), gray or art scanning for CCD.
c. Planar color scan (one line in) or Monochrome scanning for CIS.
a. 8 system clock/pixel.
b. fast gray or art scanning for CCD or CIS.
c. Planar color scan (one line in) or Monochrome scanning for CIS.
a. 16 system clock/pixel.
b. Chunky color (three line in), gray or line-art scanning for CCD.
c. Planar color scan (one line in) or Monochrome scanning for CIS.
a. 18 system clock/pixel
b. Chunky color (three line in), gray or art scanning for CCD.
c. Planar color scan (one line in) or Monochrome scan for CIS.
Page 82