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11 CIRCUIT DIAGRAM
11.1. Block Diagram-1 (Image Processing)
On this system, the CPU (IC1016) controls the operation of USB Interface Controller, Gate Array (IC1007), Sensors' block
(Paper, Starting, Door), and Panel Block (LEDs, Switch).
(Paper Feeding)
The Gate Array (IC1007) controls Conveyor Motor operation by providing some motor-pulse signals to Motor Driver (IC1015)
for the paper feed scanning.
(Image Processing)
1. Both CCD (F) and CCD (B) are driven by the drive pulses (Transfer Gate pulse, Reset pulse, Clock, and Clamp Pulse of CCD)
output from the pulse generation circuit in the Gate Array (IC1007).
2. As the result of this, the image analog signals are output from the CCD(F) and the CCD(B).
3. The analog signals are respectively converted to digital signals by the AFE (IC1004, IC1005: Analog IC) that
operates as A/D converter.
4. And the converted digital signals are transmitted to the image processing IC (Gate Array: IC1007).
5. And according to the command from PC, the Gate Array (IC1007) performs image processing such as binary-coded
processing, pseudo-gradation processing (dithering, error diffusion processing), color drop-out processing, and so on
by using SDRAM that enables the intermediate data during the process to be stored temporarily.
6. After handling this, Gate Array stores the data into the SDRAM.
7. And controlled by DMAC circuit in the Gate Array, the processed data are transmitted from SDRAM to USB-C (IC1010) and
its surrounding circuits, and are output to the PC via USB interface.
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