GL842 datasheet(55/64 Pages) GENESYS

55 / 64 page

GL842 USB 2.0 2-in-1 Scanner Controller

Page 55

CHAPTER 6 FUNCTIONAL DESCRIPTION

1 System Clock

Internal PLL.

A. PLL: 12MHz input, 24, 30, 40 MHz output to internal system .

2 Pixel Clock

A. Normal mode

Scan mode 0:

a. 12 system clock/pixel.

(three-line-in or one-line-in)

b. Chunky color(three line in),fine-gray or fine-line-art scan for CCD.

c. Planar color scan (one line in) or Monochrome scan for CIS.

B. Fast mode

Scan mode 4 (one line in):

a. 6 system clock/pixel.

b. Planar color scan (one line in) or Monochrome scan.

c. Fast-gray or fast-line-art scan for CCD.

d. Planar color(one line in),gray, true gray or line-art scan for CIS.

C. Scan mode 5 (three line in):

a. 15 system clock/pixel

b. Chunky color(three line in),fine-gray or fine-line-art scan for CCD.

c. Planar color scan (one line in) or Monochrome scan for CIS.

D. Scan mode 6 (three line in):

a. 18 system clock/pixel.

b. Chunky color(three line in),fine-gray or fine-line-art scan 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. Fast Mode: Planar color , fast gray or fast line art scan.

(scan mode 4) 6x33.333ns/pixel = 0.2us/pixel

(1). 600dpi: 1.08ms/line, 7.582s/page for fast gray or fast line art.

(2). 1200dpi: 2.160ms/line, 30.326s/page for fast gray or fast line art.

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.

b. Fast Mode: Planar color , fast gray or fast line art scan.

6x25ns/pixel = 0.15us/pixel

(1). 600dpi: 0.81ms/line, 5.616s/page for fast gray or fast line art.

(2). 1200dpi: 1.62ms/line, 22.744s/page for fast gray or fast line art.

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