（原创）如何进行有符号小数乘法运算？(Verilog)
\uff08\u539f\u521b\uff09\u5982\u4f55\u8fdb\u884c\u6709\u7b26\u53f7\u5c0f\u6570\u4e58\u6cd5\u8fd0\u7b97\uff1f(Verilog)1module fix_mult ( clk,rst_n,in_a,in_b,x1,x2,x3,x4,x5,x6,x7,y_out );2 3 input clk,rst_n; //\u65f6\u949f\u548c\u590d\u4f4d\u4fe1\u53f7 4 input [31:0] in_a,in_b; //\u8f93\u5165\u7684\u88ab\u4e58\u6570\u548c\u4e58\u6570 5 output [31:0] y_out; //\u8f93\u51fa\u7684\u4e58\u79ef 6/*\u5bc4\u5b58\u5668\u7c7b\u578b\u53d8\u91cf \u4e3a\u4e86\u80fd\u66f4\u6e05\u695a\u7684\u4e86\u89e3\u5168\u5904\u7406\u8fc7\u7a0b\uff0c7 \u7279\u5730\u8bbe\u8ba1\u4e3a\u8f93\u51fa\u7684\uff0c\u4e0d\u7136\u4eff\u771f\u53ef\u80fd\u4f1a\u88ab\u7efc\u5408\u6389*/ 8 output [15:0] x1,x2,x3,x4;9 output [0:0] x5;10 output [29:0] x6;11output [31:0] x7;1213/////////////////////////////////////////////////////14reg [31:0] y_out;15reg [15:0] x1,x2,x3,x4;16reg [0:0] x5;17reg [29:0] x6;18reg [31:0] x7;192021always @ ( posedge clk )22begin23if ( !rst_n ) //\u590d\u4f4d\u65f6\uff0c\u5168\u90e8\u5bc4\u5b58\u5668\u53d8\u91cf\u6e05\u96f624begin25 x1 <=16'b0;26 x2 <=16'b0;27 x3 <=16'b0;28 x4 <=16'b0;29 x5 <=1'b0;30 x6 <=30'b0;31 x7 <=32'b0;32 y_out <=32'b0;33end34else//\u5168\u8fc7\u7a0b\u53ef\u4ee5\u770b\u6210\uff1a\u628a32\u4f4d\u7684\u5c0f\u6570\u622a\u53d6\u9ad816\u4f4d\u2014\u300b\u5de6\u79fb16\u4f4d\uff0c\u53d8\u4e3a16\u4f4d\u6574\u6570\u2014\u300b35//\u76f8\u4e58\u5f97\u523032\u4f4d\u6574\u6570\u4e58\u79ef\u540e\uff0c\u53f3\u79fb32\u4f4d\u2014\u300b\u8c03\u6574\u65e0\u5173\u4f4d\u7684\u4f4d\u7f6e\u2014\u300b\u5f97\u523032\u4f4d\u5c0f\u657036begin37 x1 <= in_a[31:16]; //\u622a\u53d616\u4f4d\u88ab\u4e58\u6570\uff0c38 x2 <= in_b[31:16]; //\u622a\u53d616\u4f4d\u4e58\u657039 x3 <= (x1[15]==0)? x1:{x1[15],~x1[14:0]+1'b1}; //\u636e\u6700\u9ad8\u4f4d\u5224\u65ad\u662f\u5426\u4e3a\u8d1f\u6570\uff0c40//\u82e5\u8d1f\u6570\u5219\u628a\u8865\u7801\u8f6c\u6210\u539f\u780141 x4 <= (x2[15]==0)? x2:{x2[15],~x2[14:0]+1'b1}; 42 x5 <= x3[15] ^ x4[15]; //\u4e24\u6570\u7b26\u53f7\u4f4d\u76f8\u5f02\u6216\uff0c\u5f97\u5230\u4e58\u79ef\u7684\u7b26\u53f7\u4f4d43 x6 <= x3[14:0]*x4[14:0]; //\u4e24\u6570\u7684\u6570\u636e\u4f4d\u76f8\u4e5844 x7 <= {x5,x6,1'b0}; //\u4e58\u79ef\u75311\u4f4d\u7b26\u53f7\u4f4d\u548c30\u4f4d\u6570\u636e\u4f4d\u53ca1\u4f4d\u65e0\u5173\u7ec4\u6210\uff1b45//\u56e0\u4e3a\u662f\u5c0f\u6570\uff0c\u5f80\u4f4e\u4f4d\u751f\u957f\uff0c\u6240\u4ee5\u65e0\u5173\u4f4d\u653e\u7f6e\u6700\u4f4e\u4f4d46 y_out <= (x7[31]==0)? x7:{x7[31],~x7[30:0]+1'b1}; 47end48end4950endmodule
x2:{x2[15],~x2[14:0]+1'b1}; 42 x5
x2:{x2[15],~x2[14:0]+1'b1}; 42 x5 <= x3[15] ^ x4[15]; //两数符号位相异或，得到乘积的符号位43 x6 <= x3[14:0]*x4[14:0]; //两数的数据位相乘44 x7 <= {x5,x6,1'b0}; //乘积由1位符号位和30位数据位及1位无关组成；45//因为是小数，往低位生长，所以无关位放置最低位46 y_out <= (x7[31]==0)?绛旓細x2:{x2[15],~x2[14:0]+1'b1}; 42 x5 <= x3[15] ^ x4[15]; //涓ゆ暟绗﹀彿浣嶇浉寮傛垨锛屽緱鍒颁箻绉殑绗﹀彿浣43 x6 <= x3[14:0]*x4[14:0]; //涓ゆ暟鐨勬暟鎹綅鐩镐箻44 x7 <= {x5,x6,1'b0}; //涔樼Н鐢1浣嶇鍙蜂綅鍜30浣嶆暟鎹綅鍙1浣嶆棤鍏崇粍鎴愶紱45//鍥犱负鏄灏忔暟锛屽線浣庝綅鐢熼暱锛屾墍浠ユ棤鍏...
绛旓細y_out );2 3 input clk,rst_n; //鏃堕挓鍜屽浣嶄俊鍙 4 input [31:0] in_a,in_b; //杈撳叆鐨勮涔樻暟鍜屼箻鏁 5 output [31:0] y_out; //杈撳嚭鐨勪箻绉 6/*瀵勫瓨鍣ㄧ被鍨嬪彉閲 涓轰簡鑳芥洿娓呮鐨勪簡瑙ｅ叏澶勭悊杩囩▼锛7 鐗瑰湴璁捐涓鸿緭鍑虹殑锛
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