在超声波流量计中，能进行高速的ad采样，以达到ad转换的目的-In ultrasonic flowmeter, the ad can be sampled at high speed to achieve the purpose of ad conversion

超声波流量计采样控制部分的VHDL源代码，基于xilinx的spartan3-The ultrasonic flowmeter sampling control part of the VHDL source code, based on xilinx s spartan3