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如何用Python写Verilog?

  • 2026-06-28 17:44:50
如何用Python写Verilog?

事情是这样的,SoC工程师的一项典型工作就是集成。俗称连连看。

当然除了连连看还有一些集成级的代码需要设计,比如CRG,regfile,ahb/apb/local bus decoder,axi bus matrix/network等等。这些代码很多是有vendor提供工具生成,或者用脚本生成。集成工作我们前面介绍的GVim插件已经实现了自动化。总之就是能不手写代码就不手写代码。

因为只要是人手写就有可能出错,review不可能每一行都能review到,输入给代码生成脚本的文件一定是简洁明了,方便review的。而且一旦经过一次项目洗礼,后面就闭着眼睛用,一劳永逸。

那么今天给大家分享一个编写Python脚本生成一个ahb decoder的脚本。首先分析一下ahb decoder的原理。主要就两大部分。

第一部分就是slave的sel信号decoder。根据地址空间划分,选择选择不同的地址段。

第二部分是rdata和response信号的返回mux。

地址decoder部分是共用的。decoder和mux可以归纳出一些编码模版,即slave的数据量再增加,同一段代码模版可以复用,只是代码量增加。这种有固定套路的代码完全可以借助脚本生成。

规定一下脚本的输入文件形式,比如表格输入。

ahb decoder桥是1路ahb slave接口入,多路ahb master接口输出,表格中填写master接口输出名,起始地址段,结束地址段。这样review时候只需要review这个表格即可。

接下来是python脚本开发

安装pandas。用于表格处理。

sudoapt install python3-pipsudopip install pandas

缺啥库,再用pip安装即可。

接下来就开始生成代码,这类代码生成套路就是根据表格提供信息,打印代码模版替换其中的关键词。我把要生成的代码一行一行追加到一个列表中,然后再一行一行打印到一个新的.v文件中。

首先用pandas读取表格,根据输入的表格路径,sheet name,读取当前sheet的数据。

if para_list[2] == "dec_gen":        df = pd.read_excel(para_list[0], sheet_name = para_list[1])        dec_corpus = df.values.tolist()print("\nall data:")print (df)        dec_ser = pd.Series(dec_corpus)#print(dec_ser)        dec_gen(para_list, dec_corpus, dec_ser)

pandas会处理成二维列表。

然后打开一个.v文件,文件名也是用户自己输入 。创建一个空列表,往里面塞代码。

fp = open(para_list[1]+".v""w"print_line = []

给代码生成头文件,显得专业些。年份,日期,filename等自动匹配生成。

    print_line.append("// +FHDR----------------------------------------------------------------------------")    print_line.append("// Copyright (c) "+year+" SiliconPeasant.")    print_line.append("// ALL RIGHTS RESERVED Worldwide")    print_line.append("//         ")    print_line.append("// Author        : "+user)    print_line.append("// Email         : ninghechuan@foxmail.com")    print_line.append("// Created On    : "+date1+" "+time)    print_line.append("// Last Modified : "+date1+" "+time)    print_line.append("// File Name     : "+filename)    print_line.append("// Description   :")    print_line.append("// ")    print_line.append("// ---------------------------------------------------------------------------------")    print_line.append("// Modification History:")    print_line.append("// Date         By              Version                 Change Description")    print_line.append("// ---------------------------------------------------------------------------------")    print_line.append("// "+date1+"   "+user+"     1.0                     Original")    print_line.append("// -FHDR----------------------------------------------------------------------------")

然后往列表里塞Verilog代码,固定的代码模版,直接输入,比如我们要生成的ahb decoder只有一组ahb slave接口,名字暂时固定,未开放给用户。

print_line.append("module "+para_list[1]+"(")print_line.append("    input                   hclk,")print_line.append("    input                   hresetn,")print_line.append("    //slave")print_line.append("    input                   ahb_s_hsel,")print_line.append("    input   [31:0]          ahb_s_haddr,")print_line.append("    input   [1:0]           ahb_s_htrans,")print_line.append("    input                   ahb_s_hwrite,")print_line.append("    input   [2:0]           ahb_s_hsize,")print_line.append("    input   [2:0]           ahb_s_hburst,")print_line.append("    input   [3:0]           ahb_s_hprot,")print_line.append("    input   [31:0]          ahb_s_hwdata,")print_line.append("    input                   ahb_s_hready_in,")print_line.append("    output reg  [31:0]      ahb_s_hrdata,")print_line.append("    output reg              ahb_s_hready,")print_line.append("    output reg  [1:0]       ahb_s_hresp,")

接下来追加decoder输出的master的代码,根据表格第一列填写的数据,给输出的ahb master接口加上用户自定义关键词。

count = 0for dec_info in dec_corpus:  count += 1  print_line.append("    //"+dec_info[0])  print_line.append("    output reg              ahb_"+dec_info[0].lower()+"_hsel,")  print_line.append("    output reg [31:0]       ahb_"+dec_info[0].lower()+"_haddr,")  print_line.append("    output reg [1:0]        ahb_"+dec_info[0].lower()+"_htrans,")  print_line.append("    output reg              ahb_"+dec_info[0].lower()+"_hwrite,")  print_line.append("    output reg [2:0]        ahb_"+dec_info[0].lower()+"_hsize,")  print_line.append("    output reg [2:0]        ahb_"+dec_info[0].lower()+"_hburst,")  print_line.append("    output reg [3:0]        ahb_"+dec_info[0].lower()+"_hprot,")  print_line.append("    output reg [31:0]       ahb_"+dec_info[0].lower()+"_hwdata,")  print_line.append("    output reg              ahb_"+dec_info[0].lower()+"_hready_in,")  print_line.append("    input    [31:0]         ahb_"+dec_info[0].lower()+"_hrdata,")  print_line.append("    input                   ahb_"+dec_info[0].lower()+"_hready,")  print_line.append("    input    [1:0]          ahb_"+dec_info[0].lower()+"_hresp,")

追加decoder部分代码。根据地址高位产生一个index为选择slave。

print_line.append("    always @(*)begin")count = 0for dec_info in dec_corpus:  start_addr_list = list(dec_info[1])  end_addr_list   = list(dec_info[2])  #print(start_addr_list)  #print(end_addr_list)  start_dec_num = start_addr_list[2  end_dec_num = end_addr_list[2]if count == 0:    print_line.append("        if(ahb_s_haddr[15:12] >= 4'h"+start_dec_num+" && ahb_s_haddr[15:12] <= 4'h"+end_dec_num+")")else:    print_line.append("        else if(ahb_s_haddr[15:12] >= 4'h"+start_dec_num+" && ahb_s_haddr[15:12] <= 4'h"+end_dec_num+")")  print_line.append("        addroutport[3:0] = 4'h"+str(count)+";")  count += 1print_line.append("        else ")print_line.append("            addroutport[3:0] = 4'hf;")print_line.append("    end")

生成每个slave的sel decoder代码

count = 0for dec_info in dec_corpus:  print_line.append("            4'h"+str(count)+":begin")  print_line.append("                ahb_"+dec_info[0].lower()+"_hsel            = 1'b1;")  print_line.append("                ahb_"+dec_info[0].lower()+"_haddr[31:0]        = ahb_s_haddr;")  print_line.append("                ahb_"+dec_info[0].lower()+"_htrans[1:0]        = ahb_s_htrans;")  print_line.append("                ahb_"+dec_info[0].lower()+"_hwrite          = ahb_s_hwrite;")  print_line.append("                ahb_"+dec_info[0].lower()+"_hsize[2:0]        = ahb_s_hsize;")  print_line.append("                ahb_"+dec_info[0].lower()+"_hburst[2:0]        = ahb_s_hburst;")  print_line.append("                ahb_"+dec_info[0].lower()+"_hprot[3:0]        = ahb_s_hprot;")  print_line.append("                ahb_"+dec_info[0].lower()+"_hwdata[31:0]        = ahb_s_hwdata;")  print_line.append("                ahb_"+dec_info[0].lower()+"_hready_in        = ahb_s_hready_in;")    print_line.append("            end")  count += 1

生成rdata和response mux代码

print_line.append("\n")print_line.append("    always @(*)begin")print_line.append("        if(ahb_s_hsel)begin")print_line.append("            case(addroutport_d[3:0])")count = 0for dec_info in dec_corpus:  print_line.append("            4'd0:begin")  print_line.append("                ahb_s_hrdata[31:0]          = ahb_"+dec_info[0].lower()+"_hrdata;")  print_line.append("                ahb_s_hready                = ahb_"+dec_info[0].lower()+"_hready;")  print_line.append("                ahb_s_hresp[1:0]            = ahb_"+dec_info[0].lower()+"_hresp;")  print_line.append("            end")print_line.append("            default:begin")print_line.append("                ahb_s_hrdata[31:0]          = 32'h0;")print_line.append("                ahb_s_hready                = 1'h1;")print_line.append("                ahb_s_hresp[1:0]            = 2'h0;")print_line.append("            end")print_line.append("            endcase")print_line.append("        end")print_line.append("    end")

将列表中的文件,循环打印出到.v中,最后一行加上endmodule。

for line in print_line:#print(line)      fp.write(line)      fp.write('\n')  fp.write('\n')  fp.write('endmodule')  fp.close()

最后再加一个help函数

defhelp():    print("############## help ####################")    print("########################################")    print("generate dec_gen module")    print("xxb_decoder.py excel_path sheet_name dec_gen")    print("########################################")

输入命令

python3xxb_decoder.py-h

使用说明,咱们就是说,就是一个专业配套齐全。

使用命令

python3 xxb_decoder.py ./ahb_dec.xlsx ahb_dec dec_gen

本篇只是提供一个思路,生成代码机制并不完善,地址译码逻辑暂时还有限制,不过照这个思路我们就可以生成很多代码了,只要它有规律就能生成。真正做到成为一个不写Verilog的芯片工程师。这个脚本的源代码和Excel文件放GitHub上了。感兴趣的朋友可以留言多多交流。

https://github.com/NingHeChuan/Silicon_Peasant/tree/master/script

最后

写Python的时候,有些奇妙的感觉,和Verilog的思维方式完全不同,一种久违的感觉,那种代码是一行一行的执行,出错debug,加很多print然后分析。最后调试出来后,是另外一种快乐。

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  1. CONNECT:[ UseTime:0.000546s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000775s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000311s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000298s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000491s ]
  6. SELECT * FROM `set` [ RunTime:0.000218s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000560s ]
  8. SELECT * FROM `article` WHERE `id` = 487435 LIMIT 1 [ RunTime:0.000467s ]
  9. UPDATE `article` SET `lasttime` = 1783063273 WHERE `id` = 487435 [ RunTime:0.019877s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000379s ]
  11. SELECT * FROM `article` WHERE `id` < 487435 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000530s ]
  12. SELECT * FROM `article` WHERE `id` > 487435 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000358s ]
  13. SELECT * FROM `article` WHERE `id` < 487435 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001186s ]
  14. SELECT * FROM `article` WHERE `id` < 487435 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000926s ]
  15. SELECT * FROM `article` WHERE `id` < 487435 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002816s ]
0.100574s