Revision 1.3

Mar.22 2001

-2-

GL646USB

1. GENERAL DESCRIPTION

Genesys Logic's single-chip GeneScan

controller for scanner. It successfully integrates AFE (16 bits Analog Front End), featured scanner function ASIC and

USB 1.1 interface controller into one single-chip. With it’s high performance design architecture, GeneScan

only ready for supporting CIS or CCD image sensors (600dpi or 1200dpi resolution) which is used in flatbed or

transparency scanners, but also can co-work with uni-polar or bi-polar stepping motors. Advanced features of

GeneScan

motor moving, industrial standard auto suspend mode and bus-power supporting.

Except the build-in USB 1.1 interface, the capability of cooperating with USB 2.0 and IEEE 1394 interface controller

also expand the scalability of GeneScan

standards.

2. FEATURES

Design for sheetfed, flatbed and transparency scanner.

Programmable 600,1200 or 2400 DPI color CCD or CIS timing

Support fast scan for low DPI such as pre-view

Support three scanning type :pixel by pixel(pixel rate), line by line(line rate) and RGB line by turns(line rate)

Programmable dummy lines to resolve start/stop (discontinuous) problem.

48-Bits true color ( 16-Bits gray level ) scan

Support color , fine Gray , fast gray and fast B/W scan for CCD

Support color , gray , true gray and B/W scan for CIS

Built-in 16 bits Front End

16 Bits white shading , dark shading

and 12/14 Bits GAMMA correction

Programming threshold level for B/W

Exposure time is adjustable (max.524ms , 1 pixel time increment step)

Scan width(scan area) control for horizontal line( 1 pixel increment step)

Built-in USB(1.1) , external USB(2.0) and external IEEE1394 interface

Support 4M bits x 1 or x2 (256K x 16) EDO DRAM

Support digital average for DPI (non-deletion type)

Support hardware deletion type for DPI (2400 to 1 DPI ,1 DPI decrement)

Acceleration/ Deceleration double table for high speed motor moving

Stepping motor phase control ports for bi-polar or uni-polar motor

Full, half and quarter steps for motor control

Build-in Uni-polar phase PWM control

Watch-Dog protection circuit for motor, lamp and ASIC system

2 Output ports for lamp (include flatbed and transparency with PWM) control

Input port for home sensor

9 GPIO ports

Lamp timeout (sleeping) control