GL842 datasheet(25/64 Pages) GENESYS

25 / 64 page

GL842 USB 2.0 2-in-1 Scanner Controller

Page 25

Offset 17h ……………………………………………..…………..……….……. Default value = 8’h14

TGMODE1 TGMODE0

TGW5

TGW4

TGW3

TGW2

TGW1

TGW0

R/W

7-6 TGMODE[1:0] To set CCD TG mode.

00 without dummy line CCD TG type.

01 with reflectional document scanning type.

10 with transparency scanning type.

11 TGMODE=2 for simulation.

5-0 TGW[5:0]

To set CCD TG width.

Note: Can’t be programmed to logic zero.

Offset 18h ……………………………………………..…………..……..………. Default value = 8’h00

CNSET

DCKSEL1 DCKSEL0 CKTOGGLE CKDELAY1 CKDELAY0 CKSEL1

CKSEL0

R/W

7 CNSET

0 TG and clock is non-Canon CIS style.

1 TG and clock set to Canon CIS style.

6-5 DCKSEL1[1:0] 00 One time CCD Clocks speed for dummy line.

01 Two times CCD Clocks speed for dummy line.

10 Three times CCD Clocks speed for dummy line.

11 Four times CCD Clocks speed for dummy line.

4 CKTOGGLE

0 One cycle per pixel.

1 Half cycle per pixel for CCD Clock 1/2.

3-2 CKDELAY[1:0] 00 No delay

01 Delay one system clock for CCD Clock 1/2.

10 Delay two systems clock for CCD Clock 1/2.

11 Delay three systems clock for CCD Clock 1/2.

1-0 CKSEL[1:0]

00 One time CCD Clock speed for capture image.

01 Two times CCD Clock speed for capture image.

10 Three times CCD Clock speed for capture image.

11 Four times CCD Clock speed for capture image.

Note: CCD Clock speed up limitation :

1. SCANMOD=0,1 : 12 clocks/pixel a. toggle CCD : be able to speed up 1,2,3,4 times.

b. non-toggle CCD : be able to speed up 1,2,3 times.

2. SCANMOD=2 : Reserved.

3. SCANMOD=3 : Reserved.

4. SCANMOD=4 : 6 clocks/pixel

a. toggle CCD : be able to speed up 1,2,3 times.

b. non-toggle CCD : can not speed up.

5. SCANMOD=5 : 15 clocks/pixel

a. toggle CCD : be able to speed up 1,2,3,4 times.

b. non-toggle CCD : be able to speed up 1,2,3 times.

6. SCANMOD=6 : 18 clocks/pixel a. toggle CCD : be able to speed up 1,2,3,4 times.

b. non-toggle CCD : be able to speed up 1,2,3,4 times.

GL842 Datasheet(PDF) 25 Page - GENESYS LOGIC

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