我正在做一个反应计时器。我之前已经制作了单独的模块，现在剩下的就是集体使用它们。
在其他语言中，它们用作返回值的函数。在这里，我了解模块已实例化。我知道如何实例化，就像我为 LFSR 所做的那样，但对于 LED 多路复用器，我不知道该怎么做。
这是我的 LFSR 代码，它将被实例化到主模块中：
module LFSR(
input clock,
input reset,
output [29:0] rnd
);
wire feedback = rnd[29] ^ rnd[5] ^ rnd[3] ^ rnd[0];
reg [29:0] random;
always @ (posedge clock or posedge reset)
begin
if (reset)
random <= 30'hF;
else
random <= {random[28:0], feedback};
end
assign rnd = random;
endmodule
这是主要模块。在某些地方，我必须调用 LED 电路来显示“Hi”，然后再显示秒表。我已经用评论标记了它们。我该怎么做？
module reaction(
input clock,
input reset,
input start,
input stop,
output a,
output b,
output c,
output d,
output e,
output f,
output g,
output h,
output dp,
output led
);
reg [29:0] random;
LFSR random_gen(.clock(clock), .reset(reset), .rnd(random));
localparam [1:0]
idle = 2'b00,
start = 2'b01,
time_it = 2'b10,
stop = 2'b11;
reg state_reg, state_next;
reg [29:0] count_reg, count_next;
always @ (posedge clock or posedge reset)
begin
if(reset)
begin
state_reg <= idle;
count_reg <= 0;
end
else
state_reg <= state_next;
count_reg <= count_next;
end
always @ (*)
begin
state_next = state_reg; //default state stays the same
count_next = count_reg;
case(state_reg)
idle:
//"DISPLAY HI HERE .......... HOW??
if(start)
begin
count_next = random;
state_next = start;
end
start:
if(count_next == 750000000) // 750M equals a delay of 15 seconds.
begin
led = 1'b1;
state_next = time_it;
end
else
count_next = count_reg + 1;
time_it:
//START STOPWATCH????????
现在我已经做了一个工作秒表。它写在下面：
module stopwatch(
input clock,
input reset,
input start,
output a, b, c, d, e, f, g, dp,
output [3:0] an
);
reg [3:0] reg_d0, reg_d1, reg_d2, reg_d3; //registers that will hold the individual counts
reg [22:0] ticker; //23 bits needed to count up to 5M bits
wire click;
//the mod 5M clock to generate a tick ever 0.1 second
always @ (posedge clock or posedge reset)
begin
if(reset)
ticker <= 0;
else if(ticker == 5000000) //if it reaches the desired max value reset it
ticker <= 0;
else if(start) //only start if the input is set high
ticker <= ticker + 1;
end
assign click = ((ticker == 5000000)?1'b1:1'b0); //click to be assigned high every 0.1 second
always @ (posedge clock or posedge reset)
begin
if (reset)
begin
reg_d0 <= 0;
reg_d1 <= 0;
reg_d2 <= 0;
reg_d3 <= 0;
end
else if (click) //increment at every click
begin
if(reg_d0 == 9) //xxx9 - the 0.1 second digit
begin //if_1
reg_d0 <= 0;
if (reg_d1 == 9) //xx99
begin // if_2
reg_d1 <= 0;
if (reg_d2 == 5) //x599 - the two digit seconds digits
begin //if_3
reg_d2 <= 0;
if(reg_d3 == 9) //9599 - The minute digit
reg_d3 <= 0;
else
reg_d3 <= reg_d3 + 1;
end
else //else_3
reg_d2 <= reg_d2 + 1;
end
else //else_2
reg_d1 <= reg_d1 + 1;
end
else //else_1
reg_d0 <= reg_d0 + 1;
end
end
//The Circuit for Multiplexing - Look at my other post for details on this
localparam N = 18;
reg [N-1:0]count;
always @ (posedge clock or posedge reset)
begin
if (reset)
count <= 0;
else
count <= count + 1;
end
reg [6:0]sseg;
reg [3:0]an_temp;
reg reg_dp;
always @ (*)
begin
case(count[N-1:N-2])
2'b00 :
begin
sseg = reg_d0;
an_temp = 4'b1110;
reg_dp = 1'b1;
end
2'b01:
begin
sseg = reg_d1;
an_temp = 4'b1101;
reg_dp = 1'b0;
end
2'b10:
begin
sseg = reg_d2;
an_temp = 4'b1011;
reg_dp = 1'b1;
end
2'b11:
begin
sseg = reg_d3;
an_temp = 4'b0111;
reg_dp = 1'b0;
end
endcase
end
assign an = an_temp;
reg [6:0] sseg_temp;
always @ (*)
begin
case(sseg)
4'd0 : sseg_temp = 7'b1000000;
4'd1 : sseg_temp = 7'b1111001;
4'd2 : sseg_temp = 7'b0100100;
4'd3 : sseg_temp = 7'b0110000;
4'd4 : sseg_temp = 7'b0011001;
4'd5 : sseg_temp = 7'b0010010;
4'd6 : sseg_temp = 7'b0000010;
4'd7 : sseg_temp = 7'b1111000;
4'd8 : sseg_temp = 7'b0000000;
4'd9 : sseg_temp = 7'b0010000;
default : sseg_temp = 7'b0111111; //dash
endcase
end
assign {g, f, e, d, c, b, a} = sseg_temp;
assign dp = reg_dp;
endmodule
我希望我能够解释我的问题。
感谢您阅读
更新代码：
module reaction(
input clock,
input reset,
input start,
input stop,
output a,
output b,
output c,
output d,
output e,
output f,
output g,
output dp,
output [3:0] an,
output reg led
);
wire [29:0] random;
reg go_hi, go_start;
//instantiate the random number generator
LFSR random_gen(.clock(clock), .reset(reset), .rnd(random));
//inistantiate module to display hi
say_hi sayhi(.clock(clock), .reset(reset), .go(go_hi), .a(a), .b(b), .c(c), .d(d),
.e(e), .f(f), .g(g), .dp(dp), .an(an));
//instantiate the millisecond timer
stopwatch timer(.clock(clock), .reset(reset), .start(go_start), .a(a), .b(b), .c(c), .d(d),
.e(e), .f(f), .g(g), .dp(dp), .an(an));
localparam [1:0]
idle = 2'b00,
starting = 2'b01,
time_it = 2'b10;
//stop = 2'b11;
reg state_reg, state_next;
reg [29:0] count_reg, count_next;
always @ (posedge clock or posedge reset)
begin
if(reset)
begin
state_reg <= idle;
count_reg <= 0;
end
else
state_reg <= state_next;
count_reg <= count_next;
end
always @ (*)
begin
state_next = state_reg; //default state stays the same
count_next = count_reg;
case(state_reg)
idle:
begin
//DISPLAY HI HERE
go_hi = 1;
if(start)
begin
go_hi = 0; //dont display hi anymore
count_next = random;
state_next = starting;
end
end
starting:
begin
if(count_next == 750) // 750M equals a delay of 15 seconds.
begin //and starting from 'rand' ensures a random delay
led = 1'b1;
state_next = time_it;
end
else
count_next = count_reg + 1;
end
time_it:
begin
go_start = 1;
if(stop)
go_start = 0;
end
endcase
end
endmodule