说明：  本题设计一个数字存储示波器，以Xilinx公司20万门FPGA芯片为核心，辅以必要的外围电路（包括信号调理、采样保持、内部触发、A/D转换、D/A转换和I/O模块），利用VHDL语言编程，实现了任意波形
(The problem to design a digital storage oscilloscope, to Xilinx, Inc. 200,000 FPGA chip as the core, supplemented by the necessary peripherals (including signal conditioning, sample and hold, the internal trigger, A/D converter, D/A conversion and I/O modules) using VHDL language programming, the arbitrary waveform)