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9-2-2. VIF-77 Board
The signals painted on the DPR-393 board are baseband processed in the FPGA (IC300).
The FPGA (IC300) has the following functions.
•
Baseband processor FPGA (IC300)
Generating SDI signal
Multiplexing audio signal with the main-line signal
Generating video signal for the viewfinder
•
Equipped with a synchronization signal D/A converter and a reference clock signal generator
9-3. System Control System
9-3-1. AT-195 Board
The AT-195 board consists of a system control microcomputer IC (IC001) and a peripheral circuit. The flash memory (IC401) on the
board stores the main program.
The AT-195 board is connected to the SY-471 board.
9-3-2. SY-471 Board
The SY-471 board consists of an FPGA IC (IC1001) and its peripheral devices. The SY-471 board also contains an interface control
circuit, a video amplifier circuit, an audio signal processing circuit, and a sync separator circuit.
Interface control circuits
The interface control circuits are equipped with the following functions.
•
Parallel bus communication among the AT-195 board, the DPR-393 board, VIF-77 board and other transmission system boards
•
SPI communication with image sensors
2
•
I
C communication with the FDU
•
700 protocol communication between the main unit and the remote control unit (RM)
•
Serial/parallel lens control
•
Fan control
•
Tally control
•
Rotary encoder input
•
Switch input
•
Clock generation for audio PLL and A/D and D/A converters
•
Power supply to NFC and sensors and communication control
Audio signal processing circuit
The MIC 1 input audio A/D converters and analog/digital signal processing circuits are provided.
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