GL841 USB 2.0 2-in-1 Scanner Controller
Version
1.7
Genesys Logic, Inc.
GL841
High Speed USB 2.0
Two-in-one Scanner Controller
SPECIFICATION Ver. 1.7
Aug. 14, 2002
Genesys Logic, Inc.
10F, No.11, Ln. 155, Sec. 3, Peishen Rd., Shenkeng, Taipei, Taiwan
Tel: 886-2-2664-6655
Fax: 886-2-2664-5757
http://www.genesyslogic.com
GL841 USB 2.0 2-in-1 Scanner Controller
INDEX
1
GENERAL DESCRIPTION................................................................................................................ 3
2
FEATURES........................................................................................................................................... 3
3
SYSTEM BLOCK DIAGRAM ........................................................................................................... 4
4
FUNCTION BLOCK DIAGRAM....................................................................................................... 6
5
HARDWARE DESCRIPTION ........................................................................................................... 7
6
Application Description ..................................................................................................................... 14
7
COMMAND SET DESCRIPTION................................................................................................... 24
8
Package................................................................................................................................................ 49
9
Revision History.................................................................................................................................. 50
Version 1.6
2
GL841 USB 2.0 2-in-1 Scanner Controller
1 GENERAL
DESCRIPTION
Genesys Logic's single-chip GL841 (GeneScanTM series) is a high speed, high
performance, low cost and rich scalability controller for scanner. It successfully
integrates scanner function ASIC and USB 2.0 interface controller into one
single-chip. With its high performance design architecture, GL841 is not only
ready for supporting CIS or CCD image sensors (600dpi,1200dpi or 2400dpi
resolution) that are used in flatbed or transparency scanners, but is able to co-
work with uni-polar or bi-polar stepping motors. Advanced features of GL841
include five motor acceleration/ deceleration curve tables for high speed motor
moving.
2 FEATURES
Highly integrated scanner controller chip. (2-in-1; Scanner Controller and USB
2.0 Interface)
USB 2.0 High Speed (480Mbit) compliance. (USB 2.0 High Speed logo certified)
Design for sheetfed, flatbed and transparency scanner.
12 Mhz Low frequency clock input required for better EMI.
Flexible 3.3V/5V power selection for pad I/O.
Adjustable working speed for different usage.
Fast operation speed. (0.3us/pixel, in 40MHz working clock)
It costs only 12 seconds for 600dpi A4 size color scanning
Available sensor types: 600, 1200 and 2400dpi color CIS or CCD.
Support linear or stagger CCD , such as NEC , Toshiba or Sony CCD
Support 48-Bits color (16-Bits gray level ) scanning.
Support color, fine Gray, fast gray and fast B/W scan for CCD.
Support color,, gray, true gray and B/W scan for CIS.
Support three scanning types :pixel by pixel(pixel rate), line by line(line rate) and
RGB line by turns(line rate).
16 bits white/dark shading and 16-to-8 bits Gamma correction.
Support digital average and hardware deletion pixel function for speeding up low
resolution scan.
Support hardware deletion type for DPI function (2400 to 1 DPI ,1 DPI
decrement) .
Version 1.6
3
GL841 USB 2.0 2-in-1 Scanner Controller
Programmable threshold level for B/W.
Exposure time is adjustable (1 pixel time increment step).
Scan width (scan area) control for horizontal line( 1 pixel increment step).
Support 256K*16, 256K*16*2 and 1M*16 bits EDO-DRAM.
Support 5 acceleration/deceleration motor tables for detailed controllable high
speed motor moving.
Support controllableg bipolar motor in full, half and quarter steps moving.
Support controllable uni-polar motor in full and half steps moving.
Build-in PWM control phase for uni-polar motor.
Programmable dummy lines to resolve start/stop (discontinuous) problem.
Watch dog protect for lamp, motor and ASIC.
Lamp timeout (sleeping) control.
Support 16 GPIO pins and 2 GPO pins.
Output motor trigger signal under scanning for ADF.
2 Output ports for lamp(include flatbed and transparency with PWM) control.
Input port for home sensor.
Power on check status.
Support LED Blinking.
Support Back Scanning.
3 SYSTEM BLOCK DIAGRAM
A. USB 2.0 System Block Diagram
Version 1.6
4
GL841 USB 2.0 2-in-1 Scanner Controller
12 MHz
IO Device
Motor Driver
GL841
(USB2.0 Interface + Scanner ASIC
Controller)
Two-In-One Controller
DRAM
CCD/CIS
AFE
Host
Version 1.6
5
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