HDL編碼風格與編碼指南(pdf 17頁)

目 錄
第一部分：說明...............................................................................................................................4
第二部分：HDL編碼風格..............................................................................................................5
1. 文件頭和修訂列表..............................................................................................................5
1．1文件頭包含以下內容：..........................................................................................5
1．2修訂列表包含以下內容：......................................................................................5
2．聯機注釋.............................................................................................................................7
3．命名規則.............................................................................................................................7
3．1 實體和結構.............................................................................................................7
3．2 端口.........................................................................................................................7
3．3 結構體.....................................................................................................................8
3．4 元件 component.....................................................................................................8
3．5 配置.........................................................................................................................8
3．6包、函數和過程......................................................................................................8
3．6．1 包...............................................................................................................8
3．6．2 函數和過程...............................................................................................8
3．7常量和類屬說明......................................................................................................9
3．8枚舉（enumeration），數據類型，記錄和數組....................................................9
3．9信號和變量..............................................................................................................9
3．9．1 信號...........................................................................................................9
3．9．2 變量...........................................................................................................9
3．10進程和塊..............................................................................................................10
3．10．1 進程.......................................................................................................10
3．10．2 塊...........................................................................................................10
3．11測試工作台 test bench........................................................................................10
3．12文件和目錄結構..................................................................................................10
3．13其它......................................................................................................................10
第三部分：HDL編碼指導............................................................................................................11
1．複位..................................................................................................................................11
1．1 作用.......................................................................................................................11
1．2 推薦：...................................................................................................................11
1．3強烈推薦：............................................................................................................11
2．時鍾..................................................................................................................................11
2．1好的習慣：............................................................................................................11
2．2推薦：....................................................................................................................11
2．3強烈推薦：............................................................................................................12
3．總線..................................................................................................................................12
4．通用規則...........................................................................................................................12
4．1強烈推薦：............................................................................................................12
4．2同步設計和時序優化............................................................................................12
4．2．1強烈推薦：..............................................................................................12
4．2．2推薦：......................................................................................................12
4．2．3好的習慣：..............................................................................................13
5．verilog編碼指導原則......................................................................................................13
5．1一般規則................................................................................................................13
5．1．1強烈推薦：..............................................................................................13
5．1．2推薦：......................................................................................................13
5．1．3好的習慣：..............................................................................................13
5．2仿真和調試............................................................................................................13
5．2．1強烈推薦：..............................................................................................13
5．2．2好的習慣：..............................................................................................13
6．VHDL 代碼指導原則......................................................................................................14
6．1一般規則................................................................................................................14
6．1．1強烈推薦：..............................................................................................14
6．1．2好的習慣：..............................................................................................14
6．1．3好的習慣：..............................................................................................15
6．1．4推薦：......................................................................................................15
6．1．5強烈推薦：..............................................................................................15
6．2可綜合編碼............................................................................................................16
6．2．1好的習慣：..............................................................................................16
6．2．2推薦：......................................................................................................16
6．2．3強烈推薦：..............................................................................................16
6．3以仿真和調試為目的的編碼................................................................................17
6．3．1好的習慣：..............................................................................................17

第一部分：說明
1.準則的重要程度分三個層次：
好的經驗——表明這條規則是一般情況下比較好的經驗，在大多數的情況下要遵循，在特殊情況下可以突破這一規則。
推薦——推薦這一規則，在遵循這一規則的條件下，一般不會出現問題；
強烈推薦——表示嚴格規定，除非出現特別特殊的情況，否則要嚴格遵守。
2．斜體部分一般表明不按照規則執行，會出現的問題和現象，或一些相關注釋。
3．版本及修訂工作

..............................