描述
dsp通常用于運(yùn)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(shí)候，大有席卷DSP和FPGA市場(chǎng)之勢(shì)。但后來在實(shí)際中發(fā)現(xiàn)其阻力也是不小的，關(guān)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(shí)性非常高的信號(hào)處理如移動(dòng)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(hào)處理運(yùn)算，但在一個(gè)系統(tǒng)中究竟有多大的控制電路，有多少密集運(yùn)算?變數(shù)是很大的，我們不可能用一個(gè)芯片解決這個(gè)問題。對(duì)于運(yùn)算密集性系統(tǒng)，我們?nèi)绻褂眠@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(shè)計(jì)，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(gè)軟件設(shè)計(jì)者，硬件已經(jīng)完全固化，你所要做的，就是在這個(gè)固定的硬件平臺(tái)實(shí)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(wù)調(diào)度，以及算法改進(jìn)與優(yōu)化等待，DSP的關(guān)鍵優(yōu)勢(shì)包括其對(duì)于新型及復(fù)雜算法時(shí)的更短的開發(fā)時(shí)間，以及能夠運(yùn)行多種算法的靈活性。
而對(duì)于FPGA來說，你是一個(gè)硬件設(shè)計(jì)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(shí)現(xiàn)的功能會(huì)是天壤之別，F(xiàn)PGA的最大優(yōu)勢(shì)在于硬件實(shí)現(xiàn)已及通過并行處理實(shí)現(xiàn)的效率增益。使用FPGA，您大多的時(shí)間并非進(jìn)行算法設(shè)計(jì)與優(yōu)化，而是邏輯設(shè)計(jì)與時(shí)序約束等等。
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