EDA第六次实验

seg-scn

module seg_scan(
input clk,
input rst_n,
output reg[5:0] seg_sel, //digital led chip select
output reg[7:0] seg_data, //eight segment digital tube output,MSB is the decimal point
input[7:0] seg_data_0,
input[7:0] seg_data_1,
input[7:0] seg_data_2,
input[7:0] seg_data_3,
input[7:0] seg_data_4,
input[7:0] seg_data_5
);
parameter SCAN_FREQ = 200; //scan frequency
parameter CLK_FREQ = 50000000; //clock frequency

parameter SCAN_COUNT = CLK_FREQ /(SCAN_FREQ * 6) - 1;

reg[31:0] scan_timer; //scan time counter
reg[3:0] scan_sel; //Scan select counter
always@(posedge clk or negedge rst_n)
begin
if(rst_n == 1'b0)
begin
scan_timer <= 32'd0;
scan_sel <= 4'd0;
end
else if(scan_timer >= SCAN_COUNT)
begin
scan_timer <= 32'd0;
if(scan_sel == 4'd5)
scan_sel <= 4'd0;
else
scan_sel <= scan_sel + 4'd1;
end
else
begin
scan_timer <= scan_timer + 32'd1;
end
end
always@(posedge clk or negedge rst_n)
begin
if(rst_n == 1'b0)
begin
seg_sel <= 6'b111111;
seg_data <= 8'hff;
end
else
begin
case(scan_sel)
//first digital led
4'd0:
begin
seg_sel <= 6'b11_1110;
seg_data <= seg_data_0;
end
//second digital led
4'd1:
begin
seg_sel <= 6'b11_1101;
seg_data <= seg_data_1;
end
//...
4'd2:
begin
seg_sel <= 6'b11_1011;
seg_data <= seg_data_2;
end
4'd3:
begin
seg_sel <= 6'b11_0111;
seg_data <= seg_data_3;
end
4'd4:
begin
seg_sel <= 6'b10_1111;
seg_data <= seg_data_4;
end
4'd5:
begin
seg_sel <= 6'b01_1111;
seg_data <= seg_data_5;
end
default:
begin
seg_sel <= 6'b11_1111;
seg_data <= 8'hff;
end
endcase
end
end

endmodule

seg-decoder

module seg_decoder
(
input[3:0] bin_data, // bin data input
output reg[6:0] seg_data // seven segments LED output
);

always@(*)
begin
case(bin_data)
4'd0:seg_data <= 7'b100_0000;
4'd1:seg_data <= 7'b111_1001;
4'd2:seg_data <= 7'b010_0100;
4'd3:seg_data <= 7'b011_0000;
4'd4:seg_data <= 7'b001_1001;
4'd5:seg_data <= 7'b001_0010;
4'd6:seg_data <= 7'b000_0010;
4'd7:seg_data <= 7'b111_1000;
4'd8:seg_data <= 7'b000_0000;
4'd9:seg_data <= 7'b001_0000;
4'ha:seg_data <= 7'b000_1000;
4'hb:seg_data <= 7'b000_0011;
4'hc:seg_data <= 7'b100_0110;
4'hd:seg_data <= 7'b010_0001;
4'he:seg_data <= 7'b000_0110;
4'hf:seg_data <= 7'b000_1110;
default:seg_data <= 7'b111_1111;
endcase
end
endmodule

key-debounce

module key_debounce(
input clk,
input rst_n,
input key1,
output [5:0] seg_sel,
output [7:0] seg_data
);
wire button_negedge; //Key falling edge
ax_debounce ax_debounce_m0
(
.clk (clk),
.rst (~rst_n),
.button_in (key1),
.button_posedge (),
.button_negedge (button_negedge),
.button_out ()
);

wire[3:0] count;
wire t0;
count_m10 count10_m0(
.clk (clk),
.rst_n (rst_n),
.en (button_negedge),
.clr (1'b0),
.data (count),
.t (t0)
);
wire[3:0] count1;
wire t1;
count_m6 count6_m1(
.clk (clk),
.rst_n (rst_n),
.en (t0),
.clr (1'b0),
.data (count1),
.t (t1)
);
//Count decoding
wire[6:0] seg_data_0;
seg_decoder seg_decoder_m0(
.bin_data (count),
.seg_data (seg_data_0)
);

wire[6:0] seg_data_1;
seg_decoder seg_decoder_m1(
.bin_data (count1),
.seg_data (seg_data_1)
);
seg_scan seg_scan_m0(
.clk (clk),
.rst_n (rst_n),
.seg_sel (seg_sel),
.seg_data (seg_data),
.seg_data_0 ({1'b1,7'b1111_111}),
.seg_data_1 ({1'b1,7'b1111_111}),
.seg_data_2 ({1'b1,7'b1111_111}),
.seg_data_3 ({1'b1,7'b1111_111}),
.seg_data_4 ({1'b1,seg_data_1}),
.seg_data_5 ({1'b1,seg_data_0})
);
endmodule

count m10

module count_m10(
input clk,
input rst_n,
input en, //Counter enable
input clr, //Counter synchronous reset
output reg[3:0]data, //counter value
output reg t // carry enable signal
);
always@(posedge clk or negedge rst_n)
begin
if(rst_n0)
begin
data <= 4'd0;
t <= 1'd0;
end
else if(clr)
begin
data <= 4'd0;
t <= 1'd0;
end
else if(en)
begin
if(data4'd9)
begin
t<= 1'b1; //Counter to 9 to generate carry
data <= 4'd0;//Counter to 9 reset
end
else
begin
t <= 1'b0;
data <= data + 4'd1;
end
end
else
t <= 1'b0;
end

endmodule

ax-debounce

`timescale 1 ns / 100 ps
module ax_debounce
(
input clk,
input rst,
input button_in,
output reg button_posedge,
output reg button_negedge,
output reg button_out
);
//// ---------------- internal constants --------------
parameter N = 32 ; // debounce timer bitwidth
parameter FREQ = 50; //model clock :Mhz
parameter MAX_TIME = 20; //ms
localparam TIMER_MAX_VAL = MAX_TIME * 1000 * FREQ;
////---------------- internal variables ---------------
reg [N-1 : 0] q_reg; // timing regs
reg [N-1 : 0] q_next;
reg DFF1, DFF2; // input flip-flops
wire q_add; // control flags
wire q_reset;
reg button_out_d0;
//// ------------------------------------------------------

////contenious assignment for counter control
assign q_reset = (DFF1 ^ DFF2); // xor input flip flops to look for level chage to reset counter
assign q_add = ~(q_reg == TIMER_MAX_VAL); // add to counter when q_reg msb is equal to 0

//// combo counter to manage q_next
always @ ( q_reset, q_add, q_reg)
begin
case( {q_reset , q_add})
2'b00 :
q_next <= q_reg;
2'b01 :
q_next <= q_reg + 1;
default :
q_next <= { N {1'b0} };
endcase
end

//// Flip flop inputs and q_reg update
always @ ( posedge clk or posedge rst)
begin
if(rst == 1'b1)
begin
DFF1 <= 1'b0;
DFF2 <= 1'b0;
q_reg <= { N {1'b0} };
end
else
begin
DFF1 <= button_in;
DFF2 <= DFF1;
q_reg <= q_next;
end
end

//// counter control
always @ ( posedge clk or posedge rst)
begin
if(rst == 1'b1)
button_out <= 1'b1;
else if(q_reg == TIMER_MAX_VAL)
button_out <= DFF2;
else
button_out <= button_out;
end

always @ ( posedge clk or posedge rst)
begin
if(rst == 1'b1)
begin
button_out_d0 <= 1'b1;
button_posedge <= 1'b0;
button_negedge <= 1'b0;
end
else
begin
button_out_d0 <= button_out;
button_posedge <= ~button_out_d0 & button_out;
button_negedge <= button_out_d0 & ~button_out;
end
end
endmodule

count m6

module count_m6(
input clk,
input rst_n,
input en, //Counter enable
input clr, //Counter synchronous reset
output reg[3:0]data, //counter value
output reg t // carry enable signal
);
always@(posedge clk or negedge rst_n)
begin
if(rst_n0)
begin
data <= 4'd0;
t <= 1'd0;
end
else if(clr)
begin
data <= 4'd0;
t <= 1'd0;
end
else if(en)
begin
if(data4'd5)
begin
t<= 1'b1; //Counter to 5 to generate carry
data <= 4'd0;//Counter to 5 reset
end
else
begin
t <= 1'b0;
data <= data + 4'd1;
end
end
else
t <= 1'b0;
end

endmodule