Samsung SCX-1100 Service Manual page 79

CIRCUIT DESCRIPTION
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),
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
Core Process Drive power
/frequency
8bit Micro- 0.35U 3.3V
controller CMOS 75MHz
Repair Manual
3-20
3-5-1-2 Features & Functions
• 10bit scanning interface
: Supports CIS and CCD interface.
• Image processing Section
: Full quality RGB to CMYK or 6 color conversion
• JBIG compression block
• Inkjet engin format
• Printer Interface section
• Microcontroller interface part
• General purpose input and output port
Memory Interface
Package Design
208pin OASIS
QFP
<Figure 14. OA-980 Block Diagram>
- This Document can not be used without Samsung's authorization -
Needs external ADC(up to 16bit).
Photo/Text detect allows mixed documents.
Arbitrary image scaling using true interpolation.
Automatic contrast and brightness correction.
Error diffusion or programmable dither arrays.
: JBIG/MH/MR/MMR Comp. & Decomp.
: Rotates data to suit the Lexmark engin format
: Supports a single byte DMA with 150MHz clock speed.
: 8bit multiplexed bus acts as address and data bus
: 30 GPIO pins.
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