上电后，用于显示采样数据的8个led灯先全亮，然后最高位灭，下来全灭。
程序是这样的——
module amyad(clk,din,clk_ad,cs,dout);
input clk;
input din;
output clk_ad;
output reg cs;
output reg [7:0]dout;
reg [5:0]cnt_fre;
reg clk1M;
reg attach;
reg [4:0]cnt_ad;
reg [7:0]temp;
parameter period_fre = 6'd49;
parameter period_ad = 5'd27;
always@(negedge clk)
if(cnt_fre != period_fre) begin
cnt_fre <= cnt_fre + 6'd1;
clk1M <= 1'b0; end
else begin cnt_fre <= 5'd0;
clk1M <= 1'b1; end
always@(negedge clk)
if(clk1M)begin
if(cnt_ad != period_ad)
cnt_ad <= cnt_ad + 5'd1;
else cnt_ad <= 5'd0; end
always@(negedge clk)
if(clk1M)begin
if(cnt_ad >= 5'd20 && cnt_ad <= 5'd27)
attach <= 1'b1;
else attach <= 1'b0; end
assign clk_ad = (attach && clk1M);
always@(negedge clk)
if(clk1M)
case(cnt_ad)
5'd0: cs <= 1'b1;
5'd1: dout <= temp;
5'd18: cs <= 1'b0;
5'd20: temp[7] <= din;
5'd21: temp[6] <= din;
5'd22: temp[5] <= din;
5'd23: temp[4] <= din;
5'd24: temp[3] <= din;
5'd25: temp[2] <= din;
5'd26: temp[1] <= din;
5'd27: temp[0] <= din;
endcase
endmodule
高手们，指点一下吧！谢谢！ |
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