GL843 datasheet(69/84 Pages) GENESYS

69 / 84 page

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

Page 69

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

Scan mode 0:

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.

B. Scan mode 7

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.

C. Scan mode 6

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.

Note: Chunky Color is R1G1B1, R2G2B2, R3G3B3,………(three-line-in or pixel rate).

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.

3 Scan Speed

A. System clock = 30MHz:

a. Normal Mode: Chunky color, fine gray or fine line art scan.

(scan mode 0)

12x33.333ns/pixel = 0.4us/pixel.

(1). 600dpi: 2.160ms/line, 15.163s/page.

(2). 1200dpi: 4.320ms/line, 60.653s/page.

B. System clock = 40MHz:

a. Normal Mode: Chunky color, fine gray or fine line art scan.

12x25ns/pixel = 0.3us/pixel

(1). 600dpi: 1.620ms/line, 11.372s/page.

(2). 1200dpi: 3.240ms/line, 45.488s/page.

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

GL843 supports three-line-in (parallel) for CCD and one-line-in for CIS.

A. CCD Type

CCD Exposure control

There are three modes to control CCD TG by TGMODE control bits.

Mode 0: single exposure time for R, G and B channels.

Mode 1, 2: different exposure times for R, G and B channels .

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