{"id":1390,"date":"2026-05-08T13:37:41","date_gmt":"2026-05-08T05:37:41","guid":{"rendered":"http:\/\/www.hanhhsir.cn\/?p=1390"},"modified":"2026-05-08T21:36:20","modified_gmt":"2026-05-08T13:36:20","slug":"%e5%9f%ba%e4%ba%8eahb%e7%9a%84%e5%9b%9b%e9%80%9a%e9%81%93dma%e6%8e%a7%e5%88%b6%e5%99%a8%e8%ae%be%e8%ae%a1-ahb%e6%80%bb%e7%ba%bf%e6%8e%a7%e5%88%b6%e5%99%a8","status":"publish","type":"post","link":"http:\/\/www.hanhhsir.cn\/index.php\/2026\/05\/08\/%e5%9f%ba%e4%ba%8eahb%e7%9a%84%e5%9b%9b%e9%80%9a%e9%81%93dma%e6%8e%a7%e5%88%b6%e5%99%a8%e8%ae%be%e8%ae%a1-ahb%e6%80%bb%e7%ba%bf%e6%8e%a7%e5%88%b6%e5%99%a8\/","title":{"rendered":"\u57fa\u4e8eAHB\u7684\u56db\u901a\u9053DMA\u63a7\u5236\u5668\u8bbe\u8ba1-dmac_ahb_ctrl.v"},"content":{"rendered":"

\u8001\u5e08=CPU\uff0cDMA=\u5168\u80fd\u52a9\u7406\uff0c\u65e0\u4eba\u673a=\u8fd0\u8f93\u5de5\u5177\uff0cAHB=\u4e3b\u5e72\u9053\uff0cAHB\u63a7\u5236\u5668=\u9053\u8def\u7ba1\u7406\u5458\uff0cFIFO=\u529e\u516c\u5ba4\u4e2d\u8f6c\u8d27\u67b6<\/strong><\/span><\/p>\n

\/\/ \u672c\u6a21\u5757\uff1aDMA\u7684AHB\u4e3b\u63a7\u5236\u5668 \u2014\u2014 \u3010\u9053\u8def\u7ba1\u7406\u5458\u3011<\/span><\/strong>
\n\/\/ \u4f5c\u7528\uff1a\u6309\u7167AHB\u4e3b\u5e72\u9053\u89c4\u5219\uff0c\u5e2eDMA\u52a9\u7406\u6536\u53d1\u5feb\u9012\uff08\u6570\u636e\uff09<\/span><\/strong>
\n`timescale 1ns \/ 10ps<\/span><\/p>\n

module dmac_ahb_ctrl(<\/span>
\n\/\/ \u7cfb\u7edf\u65f6\u949f\u4e0e\u590d\u4f4d \u2014\u2014 \u9053\u8def\u8282\u62cd\u3001\u7cfb\u7edf\u91cd\u542f<\/span><\/strong>
\ninput clk, \/\/ \u65f6\u949f\uff1a\u9053\u8def\u6bcf\u4e00\u62cd\u8d70\u4e00\u6b65<\/span>
\ninput rst, \/\/ \u590d\u4f4d\uff1a\u6e05\u7a7a\u4efb\u52a1\uff0c\u91cd\u65b0\u5f00\u59cb<\/span><\/p>\n

\/\/ \u6765\u81eaDMA\u52a9\u7406\u7684\u547d\u4ee4 \u2014\u2014 \u52a9\u7406\u8ba9\u9053\u8def\u7ba1\u7406\u5458\u5e72\u6d3b<\/span><\/strong>
\ninput wr, \/\/ \u5199\u8bf7\u6c42\uff1a\u9001\u5feb\u9012<\/span>
\ninput rd, \/\/ \u8bfb\u8bf7\u6c42\uff1a\u53d6\u5feb\u9012<\/span>
\ninput [31:0]addr, \/\/ \u5730\u5740\uff1a\u5feb\u9012\u70b9\/\u76ee\u7684\u5730\u5730\u5740<\/span>
\ninput [31:0]wdata, \/\/ \u5199\u6570\u636e\uff1a\u8981\u9001\u51fa\u53bb\u7684\u5feb\u9012<\/span><\/p>\n

\/\/ \u9001\u56de\u7ed9DMA\u52a9\u7406\u7684\u7ed3\u679c \u2014\u2014 \u544a\u8bc9\u52a9\u7406\u53d6\u5230\u5feb\u9012\u4e86<\/span><\/strong>
\noutput [31:0]rdata, \/\/ \u8bfb\u5230\u7684\u6570\u636e\uff1a\u53d6\u56de\u6765\u7684\u5feb\u9012<\/span>
\noutput rd_en, \/\/ \u8bfb\u6709\u6548\uff1a\u5feb\u9012\u5df2\u5230\u624b\uff0c\u53ef\u4ee5\u62ff\u8d70<\/span><\/p>\n

\/\/ AHB \u4e3b\u5e72\u9053\u5916\u90e8\u4fe1\u53f7 \u2014\u2014 \u9053\u8def\u89c4\u5219\u4fe1\u53f7<\/span><\/strong>
\noutput hsel, \/\/ \u9009\u4e2d\u4ece\u8bbe\u5907\uff1a\u627e\u5230\u76ee\u6807\u5feb\u9012\u70b9<\/span>
\noutput [1:0]htrans, \/\/ \u4f20\u8f93\u7c7b\u578b\uff1a\u5f00\u59cb\u4e00\u6b21\u65b0\u8fd0\u8f93<\/span>
\noutput [2:0]hsize, \/\/ \u6570\u636e\u4f4d\u5bbd\uff1a\u4e00\u6b21\u8fd0\u591a\u5927\u5305\u88f9\uff0832\u4f4d\uff09<\/span>
\noutput hwrite, \/\/ \u8bfb\u5199\u65b9\u5411\uff1a1=\u9001\u5feb\u9012\uff0c0=\u53d6\u5feb\u9012<\/span>
\noutput [31:0]haddr, \/\/ AHB\u603b\u7ebf\u4e0a\u7684\u5730\u5740\uff1a\u62a5\u4f4d\u7f6e<\/span>
\noutput reg [31:0]hwdata, \/\/ AHB\u5199\u6570\u636e\uff1a\u653e\u5230\u4e3b\u5e72\u9053\u4e0a\u7684\u5feb\u9012<\/span>
\ninput hreadyin, \/\/ \u4ece\u8bbe\u5907\u5c31\u7eea\uff1a\u5bf9\u65b9\u51c6\u5907\u597d\u4e86\uff0c\u53ef\u4ee5\u4ea4\u63a5<\/span>
\ninput hresp, \/\/ \u54cd\u5e94\uff1a\u8fd0\u8f93\u662f\u5426\u51fa\u9519<\/span>
\ninput [31:0]hrdata \/\/ \u8bfb\u56de\u6570\u636e\uff1a\u4ece\u4e3b\u5e72\u9053\u62ff\u5230\u7684\u5feb\u9012<\/span>
\n);<\/span><\/p>\n

\/\/ \u9053\u8def\u7ba1\u7406\u5458\u76843\u79cd\u5de5\u4f5c\u72b6\u6001<\/span><\/strong>
\nparameter IDLE = 3’b001; \/\/ \u7a7a\u95f2\uff1a\u6ca1\u4e8b\u5e72\uff0c\u5f85\u547d<\/span>
\nparameter S0 = 3’b010; \/\/ \u5730\u5740\u9636\u6bb5\uff1a\u62a5\u5730\u5740\u3001\u62a5\u4efb\u52a1<\/span>
\nparameter S1 = 3’b100; \/\/ \u6570\u636e\u9636\u6bb5\uff1a\u771f\u6b63\u642c\u5feb\u9012<\/span><\/p>\n

\/\/ \u5185\u90e8\u5bc4\u5b58\u5668\uff1a\u7528\u6765\u6682\u5b58\u5730\u5740\u3001\u6570\u636e\u3001\u5ef6\u65f6\u6253\u62cd\uff08\u4fdd\u8bc1\u6d41\u6c34\u7ebf\u5bf9\u9f50\uff09<\/span><\/strong>
\nreg [31:0] addr_d; \/\/ \u6682\u5b58\u76ee\u6807\u5730\u5740<\/span>
\nreg [31:0] data_1d; \/\/ \u6682\u5b58\u8981\u9001\u7684\u5feb\u9012<\/span>
\nreg wr_d ; \/\/ \u5199\u8bf7\u6c42\u5ef6\u65f61\u62cd<\/span>
\nreg wr_2d; \/\/ \u5199\u8bf7\u6c42\u5ef6\u65f62\u62cd<\/span>
\nreg rd_d ; \/\/ \u8bfb\u8bf7\u6c42\u5ef6\u65f61\u62cd<\/span>
\nreg rd_2d; \/\/ \u8bfb\u8bf7\u6c42\u5ef6\u65f62\u62cd<\/span>
\nreg [2:0] c_state; \/\/ \u5f53\u524d\u72b6\u6001<\/span>
\nreg [2:0] n_state; \/\/ \u4e0b\u4e00\u4e2a\u72b6\u6001<\/span><\/p>\n

\/\/ ====================== \u72b6\u6001\u673a\u7b2c\u4e00\u6bb5\uff1a\u65f6\u5e8f\u66f4\u65b0 ======================<\/span><\/strong>
\n\/\/ \u6bcf\u6765\u4e00\u4e2a\u65f6\u949f\u8282\u62cd\uff0c\u66f4\u65b0\u5f53\u524d\u72b6\u6001<\/span>
\nalways @(posedge clk or negedge rst) begin<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if(!rst)<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 c_state <= IDLE; \/\/ \u590d\u4f4d\u2192\u7a7a\u95f2<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 else<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 c_state <= n_state; \/\/ \u5426\u5219\u8d70\u5230\u4e0b\u4e00\u6b65<\/span>
\nend<\/span><\/p>\n

\/\/ ====================== \u72b6\u6001\u673a\u7b2c\u4e8c\u6bb5\uff1a\u7ec4\u5408\u903b\u8f91\u5224\u65ad\u4e0b\u4e00\u6b65 ======================<\/span><\/strong>
\n\/\/ \u9053\u8def\u7ba1\u7406\u5458\u6839\u636e\u5f53\u524d\u72b6\u6001\uff0c\u51b3\u5b9a\u4e0b\u4e00\u6b65\u505a\u4ec0\u4e48<\/span>
\nalways @(*) begin<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case (c_state)<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 IDLE : begin \/\/ \u7a7a\u95f2<\/strong><\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0if(wr||rd) \/\/ \u52a9\u7406\u6d3e\u4efb\u52a1\uff1a\u9001\/\u53d6\u5feb\u9012<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0n_state = S0; \/\/ \u2192 \u8fdb\u5165\u5730\u5740\u5468\u671f<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0else<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0n_state = IDLE; \/\/ \u6ca1\u4efb\u52a1\uff0c\u7ee7\u7eed\u4f11\u606f<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0end<\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0S0 : begin \/\/ \u5730\u5740\u5468\u671f\uff1a\u62a5\u5b8c\u5730\u5740\u7acb\u523b\u8fdb\u6570\u636e\u5468\u671f<\/strong><\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 n_state = S1;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0end<\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0S1 :begin \/\/ \u6570\u636e\u5468\u671f\uff1a\u7b49\u5bf9\u65b9\u5c31\u7eea<\/strong><\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if(hreadyin==1’b1 && (wr||rd)) \/\/ \u5bf9\u65b9\u5c31\u7eea+\u8fd8\u6709\u4efb\u52a1<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 n_state = S0; \/\/ \u8fde\u7eed\u8fd0\u8f93<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 else if(hreadyin==1’b1) \/\/ \u5bf9\u65b9\u5c31\u7eea+\u6ca1\u4efb\u52a1<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 n_state = IDLE; \/\/ \u7ed3\u675f\uff0c\u56de\u5bb6<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 else<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 n_state = S1; \/\/ \u7ee7\u7eed\u7b49\u5f85<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0end<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0default: n_state = IDLE ;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 endcase<\/span>
\nend<\/span><\/p>\n

\/\/ ====================== \u8bf7\u6c42\u4fe1\u53f7\u5ef6\u65f6\u6253\u62cd\uff08AHB\u6d41\u6c34\u7ebf\u5fc5\u987b\uff09 ======================<\/span><\/strong>
\n\/\/ \u8ba9\u8bf7\u6c42\u4fe1\u53f7\u5ef6\u65f61~2\u62cd\uff0c\u548c\u5730\u5740\u3001\u6570\u636e\u5bf9\u9f50\uff0c\u4e0d\u8dd1\u98de<\/span>
\nalways@(posedge clk or negedge rst) begin<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (!rst) begin<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0wr_d <= 1’b0;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0wr_2d <= 1’b0;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0rd_d <= 1’b0;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0rd_2d<= 1’b0;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0end else begin<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0wr_d <= wr;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0rd_d <= rd;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0wr_2d <=wr_d;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0rd_2d<= rd_d;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 end<\/span>
\nend<\/span><\/p>\n

\/\/ ====================== \u9501\u5b58\u5730\u5740\uff1a\u8bb0\u4f4f\u8981\u53bb\u54ea\u4e2a\u5feb\u9012\u70b9 ======================<\/span><\/strong>
\nalways@(posedge clk or negedge rst) begin<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if(!rst) begin<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 addr_d<=32’h0;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 end else if(wr || rd) begin \/\/ \u6709\u4efb\u52a1\u65f6\uff0c\u628a\u5730\u5740\u8bb0\u4e0b\u6765<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ddr_d<=addr;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 end<\/span>
\nend<\/span><\/p>\n

\/\/ ====================== \u9501\u5b58\u8981\u9001\u7684\u5feb\u9012 ======================<\/span><\/strong>
\nalways@(posedge clk or negedge rst) begin<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0if(!rst) begin<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 data_1d<=32’h0;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0end else if(wr) begin \/\/ \u9001\u5feb\u9012\u65f6\uff0c\u5148\u628a\u5feb\u9012\u5b58\u597d<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 data_1d<=wdata;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0end<\/span>
\nend<\/span><\/p>\n

\/\/ ====================== \u4ea7\u751fAHB\u63a7\u5236\u4fe1\u53f7 ======================<\/span><\/strong>
\n\/\/ \u9009\u4e2d\u8bbe\u5907\uff1a\u627e\u5230\u5feb\u9012\u70b9<\/span>
\nassign hsel = (c_state==S0)||(c_state==S1 &&(wr_d || rd_d)) ;<\/span><\/p>\n

\/\/ \u4f20\u8f93\u7c7b\u578b\uff1aNONSEQ\uff08\u5f00\u59cb\u4e00\u6b21\u65b0\u8fd0\u8f93\uff09<\/span>
\nassign htrans = ( hsel == 1’b1 )? 2’h2:2’h0;<\/span><\/p>\n

\/\/ \u6570\u636e\u4f4d\u5bbd\uff1a32\u4f4d\uff08\u6807\u51c6\u5feb\u9012\u5927\u5c0f\uff09<\/span>
\nassign hsize = ( hsel == 1’b1 )? 3’h2:3’h0;<\/span><\/p>\n

\/\/ \u8bfb\u5199\u65b9\u5411\uff1a\u9001\u5feb\u9012=1\uff0c\u53d6\u5feb\u9012=0<\/span>
\nassign hwrite =wr_d ;<\/span><\/p>\n

\/\/ \u8f93\u51fa\u5730\u5740\u5230\u4e3b\u5e72\u9053<\/span>
\nassign haddr = ( hsel == 1’b1 )?addr_d:32’h0;<\/span><\/p>\n

\/\/ ====================== \u5f80\u4e3b\u5e72\u9053\u653e\u8981\u9001\u7684\u5feb\u9012 ======================<\/span><\/strong>
\nalways@(posedge clk or negedge rst) begin<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0if(!rst) begin<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 hwdata<=32’h0;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0end else if(hsel) begin \/\/ \u9009\u4e2d\u76ee\u6807\u540e\uff0c\u628a\u5feb\u9012\u653e\u8def\u4e0a<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 hwdata<=data_1d;<\/span>
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0end<\/span>
\nend<\/span><\/p>\n

\/\/ ====================== \u8bfb\u6709\u6548\u4fe1\u53f7\uff1a\u5feb\u9012\u53d6\u5230\u4e86\uff01 ======================<\/span><\/strong>
\n\/\/ \u6761\u4ef6\uff1a\u6570\u636e\u5468\u671f + \u5bf9\u65b9\u5c31\u7eea + \u662f\u53d6\u5feb\u9012\u4efb\u52a1<\/span>
\nassign rd_en = c_state == S1 && hreadyin==1’b1&& (rd_2d);<\/span><\/p>\n

\/\/ \u628a\u53d6\u5230\u7684\u5feb\u9012\u4ea4\u7ed9DMA\u52a9\u7406<\/span>
\nassign rdata = (rd_en == 1’b1 ) ? hrdata : 32’h0;<\/span><\/p>\n

endmodule<\/span><\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

\u8001\u5e08=CPU\uff0cDMA=\u5168\u80fd\u52a9\u7406\uff0c\u65e0\u4eba\u673a=\u8fd0\u8f93\u5de5\u5177\uff0cAHB=\u4e3b\u5e72\u9053\uff0cAHB\u63a7\u5236\u5668=\u9053\u8def\u7ba1\u7406\u5458\uff0cFIFO=\u529e\u516c\u5ba4\u4e2d\u8f6c\u8d27\u67b6 \/\/ \u672c\u6a21\u5757\uff1aDMA\u7684AHB\u4e3b\u63a7\u5236\u5668 \u2014\u2014 \u3010\u9053\u8def\u7ba1\u7406\u5458\u3011 \/\/ \u4f5c\u7528\uff1a\u6309\u7167AHB\u4e3b\u5e72\u9053\u89c4\u5219\uff0c\u5e2eDMA\u52a9\u7406\u6536\u53d1\u5feb\u9012\uff08\u6570\u636e\uff09 `timescale 1ns \/ 10ps module dmac_ahb_ctrl( \/\/ \u7cfb\u7edf\u65f6\u949f\u4e0e\u590d\u4f4d \u2014\u2014 \u9053\u8def\u8282\u62cd\u3001\u7cfb\u7edf\u91cd\u542f input clk, \/\/ \u65f6\u949f\uff1a\u9053\u8def\u6bcf\u4e00\u62cd\u8d70\u4e00\u6b65 input rst, \/\/ \u590d\u4f4d\uff1a\u6e05\u7a7a\u4efb\u52a1\uff0c\u91cd\u65b0\u5f00\u59cb \/\/ \u6765\u81eaDMA\u52a9\u7406\u7684\u547d\u4ee4 \u2014\u2014 \u52a9\u7406\u8ba9\u9053\u8def\u7ba1\u7406\u5458\u5e72\u6d3b input wr, \/\/ \u5199\u8bf7\u6c42\uff1a\u9001\u5feb\u9012 input rd, \/\/ \u8bfb\u8bf7\u6c42\uff1a\u53d6\u5feb\u9012 input [31:0]addr, \/\/ \u5730\u5740\uff1a\u5feb\u9012\u70b9\/\u76ee\u7684\u5730\u5730\u5740 input [31:0]wdata, \/\/ \u5199\u6570\u636e\uff1a\u8981\u9001\u51fa\u53bb\u7684\u5feb\u9012 \/\/ \u9001\u56de\u7ed9DMA\u52a9\u7406\u7684\u7ed3\u679c \u2014\u2014 \u544a\u8bc9\u52a9\u7406\u53d6\u5230\u5feb\u9012\u4e86 output [31:0]rdata, \/\/ \u8bfb\u5230\u7684\u6570\u636e\uff1a\u53d6\u56de\u6765\u7684\u5feb\u9012 output rd_en, \/\/ \u8bfb\u6709\u6548\uff1a\u5feb\u9012\u5df2\u5230\u624b\uff0c\u53ef\u4ee5\u62ff\u8d70 \/\/ AHB \u4e3b\u5e72\u9053\u5916\u90e8\u4fe1\u53f7 \u2014\u2014 \u9053\u8def\u89c4\u5219\u4fe1\u53f7 output hsel, \/\/ \u9009\u4e2d\u4ece\u8bbe\u5907\uff1a\u627e\u5230\u76ee\u6807\u5feb\u9012\u70b9 output [1:0]htrans, \/\/ \u4f20\u8f93\u7c7b\u578b\uff1a\u5f00\u59cb\u4e00\u6b21\u65b0\u8fd0\u8f93 output [2:0]hsize, \/\/ \u6570\u636e\u4f4d\u5bbd\uff1a\u4e00\u6b21\u8fd0\u591a\u5927\u5305\u88f9\uff0832\u4f4d\uff09 output hwrite, \/\/ \u8bfb\u5199\u65b9\u5411\uff1a1=\u9001\u5feb\u9012\uff0c0=\u53d6\u5feb\u9012 output [31:0]haddr, \/\/ AHB\u603b\u7ebf\u4e0a\u7684\u5730\u5740\uff1a\u62a5\u4f4d\u7f6e output reg [31:0]hwdata, \/\/ AHB\u5199\u6570\u636e\uff1a\u653e\u5230\u4e3b\u5e72\u9053\u4e0a\u7684\u5feb\u9012 input hreadyin, \/\/ \u4ece\u8bbe\u5907\u5c31\u7eea\uff1a\u5bf9\u65b9\u51c6\u5907\u597d\u4e86\uff0c\u53ef\u4ee5\u4ea4\u63a5 input hresp, \/\/ \u54cd\u5e94\uff1a\u8fd0\u8f93\u662f\u5426\u51fa\u9519 input [31:0]hrdata \/\/ \u8bfb\u56de\u6570\u636e\uff1a\u4ece\u4e3b\u5e72\u9053\u62ff\u5230\u7684\u5feb\u9012 ); \/\/ \u9053\u8def\u7ba1\u7406\u5458\u76843\u79cd\u5de5\u4f5c\u72b6\u6001 parameter IDLE = 3’b001; \/\/ \u7a7a\u95f2\uff1a\u6ca1\u4e8b\u5e72\uff0c\u5f85\u547d parameter S0 = 3’b010; \/\/ \u5730\u5740\u9636\u6bb5\uff1a\u62a5\u5730\u5740\u3001\u62a5\u4efb\u52a1 parameter S1 = 3’b100; \/\/ \u6570\u636e\u9636\u6bb5\uff1a\u771f\u6b63\u642c\u5feb\u9012 \/\/ \u5185\u90e8\u5bc4\u5b58\u5668\uff1a\u7528\u6765\u6682\u5b58\u5730\u5740\u3001\u6570\u636e\u3001\u5ef6\u65f6\u6253\u62cd\uff08\u4fdd\u8bc1\u6d41\u6c34\u7ebf\u5bf9\u9f50\uff09 reg [31:0] addr_d; \/\/ \u6682\u5b58\u76ee\u6807\u5730\u5740 reg [31:0] data_1d; \/\/ \u6682\u5b58\u8981\u9001\u7684\u5feb\u9012 reg wr_d ; \/\/ \u5199\u8bf7\u6c42\u5ef6\u65f61\u62cd reg wr_2d; \/\/ \u5199\u8bf7\u6c42\u5ef6\u65f62\u62cd reg rd_d ; \/\/ \u8bfb\u8bf7\u6c42\u5ef6\u65f61\u62cd reg rd_2d; \/\/ \u8bfb\u8bf7\u6c42\u5ef6\u65f62\u62cd reg [2:0] c_state; \/\/ \u5f53\u524d\u72b6\u6001 reg [2:0] n_state; \/\/ \u4e0b\u4e00\u4e2a\u72b6\u6001 \/\/ ====================== \u72b6\u6001\u673a\u7b2c\u4e00\u6bb5\uff1a\u65f6\u5e8f\u66f4\u65b0 ====================== \/\/ \u6bcf\u6765\u4e00\u4e2a\u65f6\u949f\u8282\u62cd\uff0c\u66f4\u65b0\u5f53\u524d\u72b6\u6001 always @(posedge clk or negedge rst) begin \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if(!rst) \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 c_state <= IDLE; \/\/ \u590d\u4f4d\u2192\u7a7a\u95f2 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 else \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 c_state <= n_state; \/\/ \u5426\u5219\u8d70\u5230\u4e0b\u4e00\u6b65 end \/\/ ====================== \u72b6\u6001\u673a\u7b2c\u4e8c\u6bb5\uff1a\u7ec4\u5408\u903b\u8f91\u5224\u65ad\u4e0b\u4e00\u6b65 ====================== \/\/ \u9053\u8def\u7ba1\u7406\u5458\u6839\u636e\u5f53\u524d\u72b6\u6001\uff0c\u51b3\u5b9a\u4e0b\u4e00\u6b65\u505a\u4ec0\u4e48 always @(*) begin \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case (c_state) \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 IDLE : begin \/\/ \u7a7a\u95f2 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0if(wr||rd) \/\/ \u52a9\u7406\u6d3e\u4efb\u52a1\uff1a\u9001\/\u53d6\u5feb\u9012 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0n_state = S0; \/\/ \u2192 \u8fdb\u5165\u5730\u5740\u5468\u671f \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0else \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0n_state = IDLE; \/\/ \u6ca1\u4efb\u52a1\uff0c\u7ee7\u7eed\u4f11\u606f \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0end \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0S0 : begin \/\/ \u5730\u5740\u5468\u671f\uff1a\u62a5\u5b8c\u5730\u5740\u7acb\u523b\u8fdb\u6570\u636e\u5468\u671f \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 n_state = S1; \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1390","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/www.hanhhsir.cn\/index.php\/wp-json\/wp\/v2\/posts\/1390","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.hanhhsir.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.hanhhsir.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.hanhhsir.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.hanhhsir.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1390"}],"version-history":[{"count":6,"href":"http:\/\/www.hanhhsir.cn\/index.php\/wp-json\/wp\/v2\/posts\/1390\/revisions"}],"predecessor-version":[{"id":1409,"href":"http:\/\/www.hanhhsir.cn\/index.php\/wp-json\/wp\/v2\/posts\/1390\/revisions\/1409"}],"wp:attachment":[{"href":"http:\/\/www.hanhhsir.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1390"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.hanhhsir.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1390"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.hanhhsir.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1390"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}