描述
dsp通常用于運算密集型，fpga用于控制密集型，許多人都用dsp高算法，用fpga作外圍控制電路。
去年xilinx在北京介紹FPGA和DSP融合的時候，大有席卷DSP和FPGA市場之勢。但后來在實際中發(fā)現(xiàn)其阻力也是不小的，關鍵是很難搭配FPGA和DSP的比重。我們知道FPGA擅長各種控制(也包括適時性非常高的信號處理如移動通信中基帶濾波，該濾波用C5000，C6000很難勝任，除非多芯片并行)，DSP擅長各種信號處理運算，但在一個系統(tǒng)中究竟有多大的控制電路，有多少密集運算?變數(shù)是很大的，我們不可能用一個芯片解決這個問題。對于運算密集性系統(tǒng)，我們如果使用這種芯片的話很有可能還要其他DSP，那么我們需要了解多種DSP編程和接口設計，這是否與我們的初衷背道而馳呢?
上面都是一些基本概念的介紹，下面我就來通俗介紹一下，在DSP里，你是一個軟件設計者，硬件已經(jīng)完全固化，你所要做的，就是在這個固定的硬件平臺實現(xiàn)其功能的最優(yōu)化，一般TI的DSP涉及最多的是一些基本的BIOS操作系統(tǒng)之間的任務調度，以及算法改進與優(yōu)化等待，DSP的關鍵優(yōu)勢包括其對于新型及復雜算法時的更短的開發(fā)時間，以及能夠運行多種算法的靈活性。
而對于FPGA來說，你是一個硬件設計者，F(xiàn)PGA就是一張白紙，上面寫什么，畫什么都取決于你。同樣一片F(xiàn)PGA，菜鳥和高手實現(xiàn)的功能會是天壤之別，F(xiàn)PGA的最大優(yōu)勢在于硬件實現(xiàn)已及通過并行處理實現(xiàn)的效率增益。使用FPGA，您大多的時間并非進行算法設計與優(yōu)化，而是邏輯設計與時序約束等等。
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