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Main control block of this system is CPU built in PF4-ASIC (IC9).
The CPU controls following devices and realizes the document scanning operation.
The CPU controls following devices and realizes the document scanning operation.
• Front & Back CIS (Contact Image Sensor)
• Motor (Conveyor Motor, Platen Motor)
• Sensor (Paper, Starting, Door, Auto/Manual select, Double Feed Detect Sensor)
• Panel (LED, Switch)
• Motor (Conveyor Motor, Platen Motor)
• Sensor (Paper, Starting, Door, Auto/Manual select, Double Feed Detect Sensor)
• Panel (LED, Switch)
Paper Feeding
The PF4 (IC9) provides the Motor Driver (IC20) with some motor-pulse signals and drives the Conveyor Motor to execute scanning
documents.
documents.
Image Processing
This scanner has the CIS (F) and the CIS (B). Therefore both sides of document can be scanned independently.
1. Both the CISs are driven by CIS Transfer Gate pulse and CIS Transfer Gate Clock from the PF4 (IC9).
2. As the result of this, the image analog signals are output from each CIS respectively.
3. The analog signals are converted to digital signals by AFE (Analog Front End).
1. Both the CISs are driven by CIS Transfer Gate pulse and CIS Transfer Gate Clock from the PF4 (IC9).
2. As the result of this, the image analog signals are output from each CIS respectively.
3. The analog signals are converted to digital signals by AFE (Analog Front End).
KV-N1058Y/X has 6 analog outputs from each CIS. They are converted by two AFE (IC1: Front, IC2: Back).
KV-N1028Y/X has 3 analog outputs from each CIS. They are converted by one AFE (IC2: Front & Back).
KV-N1028Y/X has 3 analog outputs from each CIS. They are converted by one AFE (IC2: Front & Back).
4. The converted digital signals are stored in the DDR3 Memory temporarily by the PF4 (IC9).
5. According to the scanning conditions from the computer, DSP in the PF4 (IC9) performs following image processing.
5. According to the scanning conditions from the computer, DSP in the PF4 (IC9) performs following image processing.
• Shading correction.
• Color conversion. (Only applied to color image data)
• JPEG compression data generation by using DDR3 Memory.
• Color conversion. (Only applied to color image data)
• JPEG compression data generation by using DDR3 Memory.
6. After handling the above process, the PF4 (IC9) stores the data into the DDR3 Memory.
7. The USB Device Controller in the PF4 (IC9) transfers data from DDR 3 memory to PC via USB interface.
8. The GMAC in the PF4 (IC9) controls the Giga-Ethernet PHY (IC39) and transfers the data from the DDR 3 memory to the PC via
7. The USB Device Controller in the PF4 (IC9) transfers data from DDR 3 memory to PC via USB interface.
8. The GMAC in the PF4 (IC9) controls the Giga-Ethernet PHY (IC39) and transfers the data from the DDR 3 memory to the PC via
the wired network.
9. The USB Host Controller(Ch.A) in the PF4 (IC9) controls the Wireless LAN Board and transfers the processed data from the
DDR3 memory to the computer via the wireless network (KV-N1058X/KV-N1028X Only).
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