基於匯流排編碼之串訊干擾最小化

Abstract

隨著製程縮減至奈米規模以及系統晶片大行其道下，雜訊干擾的問題已經是一個不容忽視的問題。特別是在GALS(Globally Asynchronous Locally Synchronous)系統下，晶片設計師採用了大量的非同步匯流排作為溝通之用。可以預見的是，未來雜訊干擾的問題在非同步匯流排下必定會更為嚴重。因此我們提出了一個再非同步匯流排下減少傳送資料時所產生的耦合電容的方法。實驗結果顯示出我們的方法可以得到多達20% 的改進，再平均情況下也可以減少18% 的雜訊干擾。即使加上了面積的考量，我們的演算法也可以增加多達10個百分點的效能。

With the process shrinking to nanometer scale and the popularity of SoC, the crosstalk issue becomes un-ignorable. Especially in the GALS systems, designers adopt asynchronous buses for communication purpose. The crosstalk effect will be a critical issue on the asynchronous bus in the future. Thus, we propose a method under an asynchronous bus to reduce the coupling capacitance induced while transmitting. Experimental results show that our method will gain up to 20% improvement and 18% on average. Even if we take the area overhead into consideration, we could still have up to 10% improvement.