3-20
CIRCUIT DESCRIPTION
Samsung Electronics
Repair Manual
3-4 MEMORY
3-4-1 GENERAL DESCRIPTION
MEMORY applied in this system are FLASH MEMORY(U7)
of 1MB, SDRAM(U9) of 2MB.
3-4-2 MEMORY CONFIGURATION
By each CHIP SELECT (/ROM_CS, /SCS1, /SCS0,
/SD_RAS ,/SD_CAS ), FLASH MEMORY and SDRAM are
selected, and DATA is accessed by HALF WORD unit.
3-5 Image processing part (U21)
3-5-1 GENERAL DESCRIPTION
Image Processor OA-980(U21) is mainly configured with
On-chip µ Controller(8bit), Scanner Interface Section(PI),
Image Processing Section(IP), Memory Interface
Section(MI), JBIG Comp & Decomp Section, Rotate and
Inkjet Engine Section, Printer Interface Section(PO), 1284
Parallel Port Interfaced and Host Interface Section(HI).
(See Figure 14 )
3-5-1-1 Physical
3-5-1-2 Features & Functions
• 10bit scanning interface
: Supports CIS and CCD interface.
Needs external ADC(up to 16bit).
• Image processing Section
: Full quality RGB to CMYK or 6 color conversion
Photo/Text detect allows mixed documents.
Arbitrary image scaling using true interpolation.
Automatic contrast and brightness correction.
Error diffusion or programmable dither arrays.
• JBIG compression block
: JBIG/MH/MR/MMR Comp. & Decomp.
• Inkjet engin format
: Rotates data to suit the Lexmark engin format
• Printer Interface section
: Supports a single byte DMA with 150MHz clock speed.
• Microcontroller interface part
: 8bit multiplexed bus acts as address and data bus
• General purpose input and output port
: 30 GPIO pins.
Core
Process
Drive power
Package
Design
/frequency
8bit Micro-
0.35U
3.3V
208pin
OASIS
controller
CMOS
75MHz
QFP
<Figure 14. OA-980 Block Diagram>
Summary of Contents for SCX-1100
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