GL848 datasheet(29/85 Pages) GENESYS

29 / 85 page

GL848 High Speed USB2.0 2-in-1 Scanner Controller With Fast ADF

Page 29

CNSET

DCKSEL1

DCKSEL0 CKTOGGLE CKDELAY1 CKDELAY0

CKSEL1

CKSEL0

R/W

7 CNSET

Select TG and clock to be non-Canon CIS style.

Select TG and clock to be Canon CIS style.

6-5 DCKSEL1 [1:0] 00

Speed 1: one CCD clock per system pixel time in shifting dummy lines.

Speed 2: two CCD clock per system pixel time in shifting dummy lines.

Speed 3: three CCD clock per system pixel time in shifting dummy lines.

Speed 4: four CCD clock per system pixel time in shifting dummy lines.

4 CKTOGGLE

One cycle per pixel.

Half cycle per pixel for CCD clock 1 & 2.

3-2 CKDELAY [1:0] 00

No delay

Delay one system clock for CCD Clock 1/2.

Delay two systems clock for CCD Clock 1/2.

Delay three systems clock for CCD Clock 1/2.

1-0 CKSEL [1:0]

Speed 1: one CCD clock per system pixel time in capturing image.

Speed 2: two CCD clock per system pixel time in capturing image.

Speed 3: three CCD clock per system pixel time in capturing image.

Speed 4: four CCD clock per system pixel time in capturing image.

Note: Speed limitation of CCD clock in different scanning modes:

1. SCANMOD=0,1 : 12 clocks/pixel

a. toggle CCD : supports speed 1,2,3,4.

b. non-toggle CCD : supports speed 1,2,3.

2. SCANMOD=2

: Reserved.

3. SCANMOD=3

: Reserved.

4. SCANMOD=4

: Reserved.

5. SCANMOD=5

: Reserved.

6. SCANMOD=6

: 18 clocks/pixel

a. toggle CCD : supports speed 1,2,3.

b. non-toggle CCD : supports speed 1,2,3,4.

7. SCANMOD=7

: 16 clocks/pixel

a. toggle CCD : supports speed up 1,2,4.

b. non-toggle CCD : supports speed 1,2,4.

Note: Toggle CCD

CCD which can output one pixel in one half cycle of CCD clock.

Non-toggle CCD

CCD which always output one pixel in one CCD clock cycle.

Offset 19h ……………………………………………..…………….…….……. Default value = 8’h00

EXPDMY7 EXPDMY6 EXPDMY5 EXPDMY4 EXPDMY3 EXPDMY2 EXPDMY1 EXPDMY0

R/W

7-0 EXPDMY[7:0] To set exposure time of dummy lines (unit = 256 pixels time) or CIS LED

turn-on tme.

CIS SP

CIS LED

EXPDMY for turn on

EXPR/EXPG/EXPB for turn off

Note: It cannot be programmed to logic zero.

Offset 1Ah ……..……………………………………..…………..……………. Default value = 8’h00

SW2SET

SW1SET

MANUAL3 MANUAL1

CK4INV

CK3INV

LINECLP

R/W

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