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KEB 14.f4.f1e-4r04 (14f4f1e4r04) 

為什么你會(huì)覺得FPGA難學(xué)？

1. 不熟悉FPGA的內(nèi)部結(jié)構(gòu)

FPGA為什么是可以編程的？恐怕很多初學(xué)者不知道，他們也不想知道。因?yàn)樗麄冇X得這是無關(guān)緊要的。他們潛意識(shí)的認(rèn)為可編程嘛，肯定就是像寫軟件一樣啦。軟件編程的思想根深蒂固，看到Verilog或者VHDL就像看到C語言或者其它軟件編程語言一樣。一條條的讀，一條條的分析。

拒絕去了解為什么FPGA是可以編程的，不去了解FPGA的內(nèi)部結(jié)構(gòu)，要想學(xué)會(huì)FPGA 恐怕是天方夜譚。那么FPGA為什么是可以“編程”的呢？首先來了解一下什么叫“程”。其實(shí) “程”只不過是一堆具有一定含義的01編碼而已。

編程，其實(shí)就是編寫這些01編碼。只不過我們現(xiàn)在有了很多開發(fā)工具運(yùn)算或者是其它操作。所以軟件是一條一條的，通常都不是直接編寫這些01編碼，而是以高級(jí)語言的形式來編寫，最后由開發(fā)工具轉(zhuǎn)換為這種01編碼而已。對(duì)于軟件編程而言，處理器會(huì)有一個(gè)專門的譯碼電路逐條把這些01編碼翻譯為各種控制信號(hào)，然后控制其內(nèi)部的電路完成一個(gè)個(gè)的讀，因?yàn)檐浖牟僮魇且徊揭徊酵瓿傻摹?

而FPGA的可編程，本質(zhì)也是依靠這些01編碼實(shí)現(xiàn)其功能的改變，但不同的是FPGA之所以可以完成不同的功能，不是依靠像軟件那樣將01編碼翻譯出來再去控制一個(gè)運(yùn)算電路，F(xiàn)PGA里面沒有這些東西。

FPGA內(nèi)部主要三塊：可編程的邏輯單元、可編程的連線和可編程的IO模塊。

KEB 14.f4.f1e-4r04 (14f4f1e4r04) RED LION CONTROLS # IMP20162 APOLLO INTELIGENT METER



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KEB 14.f4.f1e-4r04 (14f4f1e4r04)