70 lines
1.2 KiB
Coq
70 lines
1.2 KiB
Coq
|
//七段四位译码器
|
||
|
|
module jyh_4490_4_encoder(sel,codeout,clk, d1, d2, d3, d4);
|
||
|
|
input clk;
|
||
|
|
input [6:0] d1, d2, d3, d4;
|
||
|
|
output reg [3:0] sel; //位选
|
||
|
|
output reg [6:0] codeout; //型码
|
||
|
|
|
||
|
|
|
||
|
|
//当前位置数字
|
||
|
|
reg [6:0] code_loc;
|
||
|
|
|
||
|
|
//实验性消影
|
||
|
|
reg isEnable;
|
||
|
|
reg [3:0] loc=4'b1000;
|
||
|
|
|
||
|
|
//循环移位
|
||
|
|
always @(posedge clk)
|
||
|
|
begin
|
||
|
|
if(isEnable)
|
||
|
|
isEnable<=0;
|
||
|
|
else
|
||
|
|
begin
|
||
|
|
isEnable<=1;
|
||
|
|
if(loc==4'b0001)
|
||
|
|
loc=4'b10;
|
||
|
|
else if(loc==4'b0010)
|
||
|
|
loc=4'b100;
|
||
|
|
else if(loc==4'b0100)
|
||
|
|
loc=4'b1000;
|
||
|
|
else if(loc==4'b1000)
|
||
|
|
loc=4'b1;
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
always @(*)
|
||
|
|
begin
|
||
|
|
if(isEnable)
|
||
|
|
begin
|
||
|
|
case (loc)
|
||
|
|
4'b0001: begin code_loc = d1; sel = 4'b0001; end
|
||
|
|
4'b0010: begin code_loc = d2; sel = 4'b0010; end
|
||
|
|
4'b0100: begin code_loc = d3; sel = 4'b0100; end
|
||
|
|
4'b1000: begin code_loc = d4; sel = 4'b1000; end
|
||
|
|
endcase
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
always @(*)
|
||
|
|
begin
|
||
|
|
if(isEnable)
|
||
|
|
begin
|
||
|
|
case (code_loc)
|
||
|
|
4'd0: codeout<=7'b1111110;
|
||
|
|
4'd1: codeout<=7'b0110000;
|
||
|
|
4'd2: codeout<=7'b1101101;
|
||
|
|
4'd3: codeout<=7'b1111001;
|
||
|
|
4'd4: codeout<=7'b0110011;
|
||
|
|
4'd5: codeout<=7'b1011011;
|
||
|
|
4'd6: codeout<=7'b1011111;
|
||
|
|
4'd7: codeout<=7'b1110000;
|
||
|
|
4'd8: codeout<=7'b1111111;
|
||
|
|
4'd9: codeout<=7'b1111011;
|
||
|
|
default: codeout<=7'bx;
|
||
|
|
endcase
|
||
|
|
end
|
||
|
|
else
|
||
|
|
codeout=7'b0;
|
||
|
|
end
|
||
|
|
|
||
|
|
endmodule
|