Multi-Channel Data Regeneration System Based On CPCI Bus

Based on system's functional requirement. The topic adopts modular design thought and proposes a scheme of multi-channel data regeneration system based on CPCI bus.The whole system is divided into three modules, namely, CPCI bus interface module.DSP module and 32 channels D/A conversion module.CPCI bus interface module mainly achieves CPCI interface. Implement method is using specific bridge chip PCI9056 with the FPGA logic.This method reduces design's difficulty and cuts down design's time.achieves the better data transmittable function.DSP module's function is generating or receiving 32 channels' digital signals, controlling converting rate.each channel's working state,analog signal's amplitude and frequency in order to control by software.D/A conversion module mainly achieves 32 channels' D/A converse. It is made of FPGA D/A chips and some secondary chips.FPGA distributes digital signal from DSP to D/A chips and generates D/A working clock according to parameters setted by DSP.D/A chips complete 32-channel D/A conversion.At the same time, based on system's index requirement, analyse the factors effecting amplitude and phase coherence error between channels in system.choice reasonable device to ensure consistency between 32 channels in plate.Also,the system adopts LVDS protocol forming a high-precision clock synchronous network to achieve the function of multi-board synchronization and ensure the phase coherence between the various channels.Finally,put forward a simple way for testing D/A board's indicators,including dynamic range,phase and amplitude coherence consistency between channels,build a tes; platform to verify the feasibility of the method.Through testing,multi-channel data regeneration system based on CPCI bus has been used,the various functions and technical indicators have achieved the system requirements.