verilog hdl语言编写，频率测量系统中的一个子单元-verilog hdl Language, frequency measurement system in a sub-unit

verilog和vhdl混写的工程 内含mc8051软核及最小系统 经测试已调通(Verilog and VHDL mixed with the project, including the mc8051 soft core and the smallest system, the test has been transferred)