我正在做一个反应计时器。我以前制作了各个模块，现在剩下的就是集体使用它们了。
在其他语言中，它们用作返回值的函数。在这里，我了解模块是实例化的。我知道如何像LFSR一样实例化，但对于LED多路复用器，我不知道如何。
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电路显示“Hi”，然后再显示秒表。我用评论标记了他们......我怎么能这样做？
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。其编写如下：
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
答案 0 :(得分：2)
在某些地方，我必须调用LED电路显示“Hi”，然后再显示秒表。我用评论标记了他们......我怎么能这样做？
如果你想了解verilog，你必须打破你称之为“模块”的想法。模块在您需要时不存在。在您的情况下，您需要实例化一个秒表模块，并连接端口（LFSR实例化下面的行可能是一个合适的位置）。
执行此操作时，请注意秒表始终驱动输出LED，而不仅仅是在某些状态下。如果要更改显示模式（显示 Hi 等字符串，或显示秒表时间），您应该输入秒表模块，告诉它应显示的内容。
也许可以使用像display_mode这样的输入，其中2'd0表示显示“hi”，2'd1表示显示秒表时间，2'd2表示显示跳舞模式等。
在主响应模块的适当位置，您可以更改display_mode的值，然后更改stopwatch驱逐的内容。