我做的毕设题目是基于fpga的数字滤波器设计
以下是我从辅导书上面找的有关程序设计
首先是直接型fir数字滤波器
module FIR1(out,x,clk);
output[10:0] out;
input[3:0] x;
input clk;
reg[3:0] xfirst,xsecond,xthird,xfourth,xfifth,xsixth,xseventh,xeighth;
wire[7:0] yfirst,ysecond,ythird,yfourth,yfifth,ysixth,yseventh,yeighth;
reg[10:0] out;
reg[8:0] out1,out2,out3,out4;
// 定义滤波器系数
parameter
h1 = 4'b0110, h2 = 4'b0010
h3 = 4'b0011, h4 = 4'b0100
h5 = 4'b0100, h6 = 4'b0011
h7 = 4'b0010, h8 = 4'b0110;
always @(posedge clk)
begin
xfirst < = x;
xsecond < = xfirst;
xthird < = xsecond;
xfourth < = xthird;
xfifth < = xfourth;
xsixth < = xfifth;
xseventh < = xsixth;
xeighth < = xseventh;
end
add_tree r1(yfirst,xfirst,h1,clk), //乘法器操作采用加法树实现
r2(ysecond,xsecond,h2,clk),
r3(ythird,xthird,h3,clk),
r4(yfourth,xfourth,h4,clk),
r5(yfifth,xfifth,h5,clk),
r6(ysixth,xsixth,h6,clk),
r7(yseventh,xseventh,h7,clk),
r8(yeighth,xeighth,h8,clk);
always @(posedge clk)
begin
out1 = yfirst + ysecond;
out2 = ythird + yfourth;
out3 = yfifth + ysixth;
out4 = yseventh + yeighth;
out = out1 + out2 + out3+ out4;
end
endmodule
结果我在想使用waveform看波形时就发生了错误，希望有高手来指点一下
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