Circuit Description; Block Diagram-1 (Image Processing) - Panasonic KV-S5076H Service Manual

11 CIRCUIT DESCRIPTION

11.1. Block Diagram-1 (Image Processing)

On this system, the CPU (IC0006) controls operation of the ASICs (IC0035,IC0038), FPGA (IC0030,IC0031),the Sensors (Paper
Sensor and others), and the Motors (Paper Feed and others).
Motor pulse signals for conveying paper (Conveyor Motor) are provided from the ASIC (IC0035).
On the other hand, motor pulse signals for the other motors are provided from the CPU (IC0006) and FPGA (IC0030).
The FPGA (IC0030) requires SDRAM (IC0033) as the buffer memory.
FPGA (IC0030) SDRAM (IC0033) as the buffer memory.
The ASIC (IC0035) requires SDRAM (IC0040, IC0041, IC0055, IC0056) to store and output pre-processed and post-processed
image data for the front side.
The FPGA (IC0031) requires SDRAM (IC0034) as the buffer memory.
The ASIC (IC0038) requires SDRAM (IC0042, IC0043, IC0057, IC0058) to store and output pre-processed and post-processed
image data for the back side.
In order to perform duplex scanning, this scanner has 2 CISs (CIS(F), CIS(B)) to scan image signals for the front and back sides.
The FPGA (IC0030) receive front image signals from CIS(F), and then performs the line correction for them.After that, the ASIC
(IC0035) pre-processes them.
CIS(F) and FPGA(IC0030) are connected with a differential signals.
The FPGA (IC0031) receive front image signals from CIS(B), and then performs the line correction for them.After that, the ASIC
(IC0038) pre-processes them.
CIS(B) and FPGA (IC0031) are connected with a differential signals.
(Pre-process means shading correction and dpi transformation)
After finishing pre-processing, the ASIC (IC0035, IC0038) post-process the data into binary or compressed data.
Then the ASIC (IC0035, IC0038) sends the data which performed post-processing to USB Controller (IC0001) via FPGA (IC0030).
And ASIC (IC0035, IC0038) sends the data which relayed FPGA (IC0030) and performed post-processing to the USB controller
(IC0001).
The USB controller (IC0001) sends data to the PC via USB interface.
＊ Post-process means binary processing (simple binary, auto binary, dither, error diffusion), color, and gray scale image processing
(MTF, Color Correction, Gamma Correction etc.).
136