FPGA 兩位數(shù)相加BCD碼顯示

1、/-DE2 開發(fā)板平臺程序/-FPGA verilog 程序/-HEX7,顯示A1位，HEX6顯示A0位，HEX5顯示B1，HEX4顯示B0，HEX2/-顯示相加結(jié)果的百位，HEX1顯示十位，HEX0顯示個位 /-輸入有SW17-SW2控制，每四個按鍵輸入一位。Clear設(shè)置成按鍵，輸入改變/-則按一次按鍵module display_puls2 ( A1,A0,B1,B0,HEX7,HEX6,HEX5,HEX4,HEX2,HEX1,HEX0,clear);input 3:0 A1;input 3:0 A0; /A1,為高位，A0為低位 input clear ; /1-有效，產(chǎn)生一個脈沖計算

2、一次結(jié)果input 3:0 B1,B0;output 6:0 HEX7,HEX6,HEX5,HEX4,HEX2,HEX1,HEX0;reg 6:0 HEX7,HEX6,HEX5,HEX4,HEX2,HEX1,HEX0;/- reg 3:0 C1,C0,Z1,Z0,S2,S1,S0; reg 4:0 T0,T1; /因為兩數(shù)相加的結(jié)果可能大于四位，所以取五位寬度 always (posedge clear) begin T0=A0+B0; if( T0>9) begin Z0=10; C0=1; end else begin Z0=0; C0=0; end T1=A1+B1+C0;if(

3、T1>9) begin Z1=10;C1=1;endelse begin Z1=0; C1=0;endS0=T0-Z0;S1=T1-Z1;S2=C1; end always (A1 or A0 or B1 or B0) begin case (A1) 4'd0: HEX7=7'b1000000; 4'd1: HEX7=7'b1111001; 4'd2: HEX7=7'b0100100; 4'd3: HEX7=7'b0110000; 4'd4: HEX7=7'b0011001; 4'd5: HEX7=7

4、'b0010010; 4'd6: HEX7=7'b0000010; 4'd7: HEX7=7'b1011000; 4'd8: HEX7=7'b0000000; 4'd9: HEX7=7'b0010000; default: HEX7=7'b1000000; endcase case (A0) 4'd0: HEX6=7'b1000000; 4'd1: HEX6=7'b1111001; 4'd2: HEX6=7'b0100100; 4'd3: HEX6=7'

5、;b0110000; 4'd4: HEX6=7'b0011001; 4'd5: HEX6=7'b0010010; 4'd6: HEX6=7'b0000010; 4'd7: HEX6=7'b1011000; 4'd8: HEX6=7'b0000000; 4'd9: HEX6=7'b0010000; default: HEX6=7'b1000000; endcase case (B1) 4'd0: HEX5=7'b1000000; 4'd1: HEX5=7'b11

6、11001; 4'd2: HEX5=7'b0100100; 4'd3: HEX5=7'b0110000; 4'd4: HEX5=7'b0011001; 4'd5: HEX5=7'b0010010; 4'd6: HEX5=7'b0000010; 4'd7: HEX5=7'b1011000; 4'd8: HEX5=7'b0000000; 4'd9: HEX6=7'b0010000; default: HEX6=7'b1000000; endcase case (B

7、0) 4'd0: HEX4=7'b1000000; 4'd1: HEX4=7'b1111001; 4'd2: HEX4=7'b0100100; 4'd3: HEX4=7'b0110000; 4'd4: HEX4=7'b0011001; 4'd5: HEX4=7'b0010010; 4'd6: HEX4=7'b0000010; 4'd7: HEX4=7'b1011000; 4'd8: HEX4=7'b0000000; 4'd9: HEX4=7&#

8、39;b0010000; default: HEX5=7'b1000000; endcase end always ( S2 or S1 or S0) begin case (S0) 4'd0: HEX0=7'b1000000; 4'd1: HEX0=7'b1111001; 4'd2: HEX0=7'b0100100; 4'd3: HEX0=7'b0110000; 4'd4: HEX0=7'b0011001; 4'd5: HEX0=7'b0010010; 4'd6: HEX0=7&#

9、39;b0000010; 4'd7: HEX0=7'b1011000; 4'd8: HEX0=7'b0000000; 4'd9: HEX0=7'b0010000; default: HEX0=7'b1000000; endcase case (S1) 4'd0: HEX1=7'b1000000; 4'd1: HEX1=7'b1111001; 4'd2: HEX1=7'b0100100; 4'd3: HEX1=7'b0110000; 4'd4: HEX1=7'b

10、0011001; 4'd5: HEX1=7'b0010010; 4'd6: HEX1=7'b0000010; 4'd7: HEX1=7'b1011000; 4'd8: HEX1=7'b0000000; 4'd9: HEX1=7'b0010000; default: HEX1=7'b1000000; endcase case (S2) 4'd0: HEX2=7'b1000000; 4'd1: HEX2=7'b1111001; 4'd2: HEX2=7'b0100100; 4'd3: HEX2=7'b0110000; 4'd4: HEX2=7'b0011001; 4'd5: HEX2=7'b0010010; 4'd6: