Attention, please: 
	1. must pullup scl and sda signals .
    2. the frequency of clk must >= 5MHz, and  <= 200MHz.


1.Run Command
    method : make vcs , in the Terminal of the Linux to run functional simulation by software VCS
             make verdi , in the Terminal of the Linux to check waveform by software Verdi

2.Files Introduction

    makefile  : simulation script file
