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This paper brings forward a video recording and replaying system with the architecture of Digital Signal Processor (DSP)
and Field Programmable Gate Array (FPGA). The system achieved encoding, recording, decoding and replaying of
Video Graphics Array (VGA) signals which are displayed on a monitor during airplanes and ships’ navigating. In the
architecture, the DSP is a main processor which is used for a large amount of complicated calculation during digital
signal processing. The FPGA is a coprocessor for preprocessing video signals and implementing logic control in the
system. In the hardware design of the system, Peripheral Device Transfer (PDT) function of the External Memory
Interface (EMIF) is utilized to implement seamless interface among the DSP, the synchronous dynamic RAM (SDRAM)
and the First-In-First-Out (FIFO) in the system. This transfer mode can avoid the bottle-neck of the data transfer and
simplify the circuit between the DSP and its peripheral chips. The DSP’s EMIF and two level matching chips are used to
implement Advanced Technology Attachment (ATA) protocol on physical layer of the interface of an Integrated Drive
Electronics (IDE) Hard Disk (HD), which has a high speed in data access and does not rely on a computer. Main
functions of the logic on the FPGA are described and the screenshots of the behavioral simulation are provided in this
paper. In the design of program on the DSP, Enhanced Direct Memory Access (EDMA) channels are used to transfer data
between the FIFO and the SDRAM to exert the CPU’s high performance on computing without intervention by the CPU
and save its time spending. JPEG2000 is implemented to obtain high fidelity in video recording and replaying. Ways and
means of acquiring high performance for code are briefly present. The ability of data processing of the system is
desirable. And smoothness of the replayed video is acceptable. By right of its design flexibility and reliable operation,
the system based on DSP and FPGA for video recording and replaying has a considerable perspective in analysis after
the event, simulated exercitation and so forth.
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