gl846 Genesys Logic, gl846 Datasheet - Page 89

• Manufacturer Part Number: gl846
• Description: High Speed Usb 2.0 2-in-1 Scanner Controller With Fast Adf
• Manufacturer: Genesys Logic

GL846 High Speed USB2.0 2-in-1 Scanner Controller With Fast ADF
GL846 can feed document sheets automatically to scanning window. After sensing the present of document by
document sensor, software should issue feed command to GL846 for paper feeding. After document sheet
reaches ADF sensor, scanning process will be started after PREFED motor steps.
Scanning Window
Document Sheet
ADF
Document
Sensor
Sensor
PSTFED
When document sheet keeps moving forward, after sensing the absent of document by ADF sensor, scanning
process will be terminated after PSTFED scanning lines.
33 Supports RS232 Interface
GL846 supports RS232 interface via internal logic circuitry. Programmers need to set the RS232SEL control
bit to logic ‘1’. GPIO6 transmits the data of RS232 and GPIO28 receives the data of RS232 under RS232
mode. The baud rate can be programmed to 2400,4800, 9600 and 19200 bps by S/W.
34 Supports EEPROM (93C46) Interface
GL846 supports EEPROM interface via internal logic circuitry. Programmers need to set the EPROMSEL
control bit to logic ‘1’. GPIO1 controls SK of external EEPROM, GPIO2 controls DI/DO of EEPROM and
GPIO17 controls CS of external EEPROM under EEPROM mode.
35 Supports External 24Kbytes flash ROM or Internal 24Kbyte mask ROM
Designers can use 24K bytes embedded mask ROM or external flash ROM. Firmware can be downloaded to
flash ROM directly by PC S/W. It provides a flexible development environment to design the firmware.
36 “True gray” with R,G and B weightings
Designers can obtain the “true gray” image data by enabling “true gray” function. Image data is generated by
R,G and B outputs and multiplied by weightings.
Formula of true gray value = R*(TRUER [7:0]) + G*(TRUEG [7:0]) + B*(TRUEB [7:0])
37 Lossless Data Compression
GL846 use Huffman coding method to implement the lossless data compression.
38 Lines Packing for Stagger CCD or R/G/B Line Differences
GL846 packs R, G and B lines together for CCD sensors by hardware. And it also packs the same color lines
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