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                            電平和脈沖是數字電路設計中常見的兩個概念，兩個概念都是相對于某個確定的時鐘域而言的。對于某個確定的時鐘域，單周期的時鐘信號為脈沖，多周期的時鐘信號為電平，如圖1所示。脈沖同步的意思就是將A時鐘域的單周期信號同步到B時鐘域，在B時鐘域產生一個寬度為clkb的單周期信號，如圖2所示。實現如圖2所示的波形轉換的電路稱之為脈沖同步電路，可以分為慢到快轉換電路和快到慢轉換電路。
![](https://img.kancloud.cn/b3/e4/b3e471c9c5775582d1c631ed35f8f16e_659x172.png)
圖1 脈沖和電平
![](https://img.kancloud.cn/6c/f3/6cf31bf92100b16820d0cac92e51ac51_1218x218.png)
圖2 脈沖同步波形示意圖











                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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