我正在使用FPGA（BEMICROMAX10）和一些面包板组件开展Verilog项目。该项目是制作一个数字时钟，您还可以使用FPGA上的按钮设置时间。我意识到这个Verilog代码不是最有效的编写方式，但它是我目前如何设置的。
从几秒钟到几分钟到几小时的时间，在我启动时工作正常，但我无法通过按钮来手动更改分钟和小时（当秒运行时）。如果你看了很长一段时间后的第98行，我会在添加＆＃39;或posedge outm＆＃39;时遇到错误。我尝试了其他的东西，但似乎我得到的是“无法匹配的操作数”和＃39;错误或多个常量驱动程序＆＃39;我假设的错误告诉我，我试图用多个输入（来自clk和btn）来改变countmin和counthr。我真的卡住了，不知道从哪里开始。
我刚刚做了一个编辑，用FPGA上的另一个时钟输入驱动slow_clk2，并添加了按钮的outm行，但仍然没有运气。
module digital_clock(clk, clk2, minbtn, hrbtn, segsec, segmin, seghr);
input clk, clk2, minbtn, hrbtn;
output [13:0] segsec;
output [13:0] segmin;
output [13:0] seghr;
parameter N = 25;
reg [N-1:0] slow_clk = 0;
reg [7:0] countsec = 0, countmin = 0, counthr = 8'h1;
parameter M = 13;
reg [M-1:0] slow_clk2 = 0;
reg [7:0] delay = 0;
reg [7:0] delay2 = 0;
wire outm, outh;
always @ (posedge clk)
slow_clk <= slow_clk + 1'b1;
always @ (posedge clk2)
slow_clk2 <= slow_clk2 + 1;
always @ (posedge slow_clk2[M-1])
begin
delay <= delay << 1;
delay2 <= delay2 << 1;
delay[0] <= ~minbtn;
delay2[0] <= ~hrbtn;
end
assign outm = delay[7] & delay[6] & delay[5] & delay[4] & delay[3] & delay[2] & delay[1] & delay[0];
assign outh = delay2[7] & delay2[6] & delay2[5] & delay2[4] & delay2[3] & delay2[2] & delay2[1] & delay2[0];
always @ (posedge slow_clk[N-1])
if (countsec == 8'b00111011) countsec <= 8'b0;
else countsec <= countsec + 8'b1;
assign segsec = (countsec == 8'h0 ) ? 16'b01111110111111:
(countsec == 8'h1) ? 16'b01111110000110: //1 0000110 0111111
(countsec == 8'h2) ? 16'b01111111011011: //2 1011011
(countsec == 8'h3) ? 16'b01111111001111: //3 1001111
(countsec == 8'h4) ? 16'b01111111100110: //4 1100110
(countsec == 8'h5) ? 16'b01111111101101: //5 1101101
(countsec == 8'h6) ? 16'b01111111111101: //6 1111101
(countsec == 8'h7) ? 16'b01111110000111: //7 0000111
(countsec == 8'h8) ? 16'b01111111111111: //8 1111111
(countsec == 8'h9) ? 16'b01111111101111: //9 1101111
(countsec == 8'ha) ? 16'b00001100111111: //10
(countsec == 8'hb) ? 16'b00001100000110://11
(countsec == 8'hc) ? 16'b00001101011011://12
(countsec == 8'hd) ? 16'b00001101001111://13
(countsec == 8'he) ? 16'b00001101100110: //14
(countsec == 8'hf) ? 16'b00001101101101: //15
(countsec == 8'h10) ? 16'b00001101111101://16
(countsec == 8'h11) ? 16'b00001100000111://17
(countsec == 8'h12) ? 16'b00001101111111://18
(countsec == 8'h13) ? 16'b00001101101111://19
(countsec == 8'h14) ? 16'b10110110111111://20
(countsec == 8'h15) ? 16'b10110110000110://21
(countsec == 8'h16) ? 16'b10110111011011://22
(countsec == 8'h17) ? 16'b10110111001111://23
(countsec == 8'h18) ? 16'b10110111100110://24
(countsec == 8'h19) ? 16'b10110111101101://25
(countsec == 8'h1a) ? 16'b10110111111101://26
(countsec == 8'h1b) ? 16'b10110110000111://27
(countsec == 8'h1c) ? 16'b10110111111111://28
(countsec == 8'h1d) ? 16'b10110111101111://29
(countsec == 8'h1e) ? 16'b10011110111111://30
(countsec == 8'h1f) ? 16'b10011110000110://31
(countsec == 8'h20) ? 16'b10011111011011://32
(countsec == 8'h21) ? 16'b10011111001111://33
(countsec == 8'h22) ? 16'b10011111100110://34
(countsec == 8'h23) ? 16'b10011111101101://35
(countsec == 8'h24) ? 16'b10011111111101://36
(countsec == 8'h25) ? 16'b10011110000111://37
(countsec == 8'h26) ? 16'b10011111111111://38
(countsec == 8'h27) ? 16'b10011111101111://39
(countsec == 8'h28) ? 16'b11001100111111://40
(countsec == 8'h29) ? 16'b11001100000110://41
(countsec == 8'h2a) ? 16'b11001101011011://42
(countsec == 8'h2b) ? 16'b11001101001111://43
(countsec == 8'h2c) ? 16'b11001101100110://44
(countsec == 8'h2d) ? 16'b11001101101101://45
(countsec == 8'h2e) ? 16'b11001101111101://46
(countsec == 8'h2f) ? 16'b11001100000111://47
(countsec == 8'h30) ? 16'b11001101111111://48
(countsec == 8'h31) ? 16'b11001101101111://49
(countsec == 8'h32) ? 16'b11011010111111://50
(countsec == 8'h33) ? 16'b11011010000110://51
(countsec == 8'h34) ? 16'b11011011011011://52
(countsec == 8'h35) ? 16'b11011011001111://53
(countsec == 8'h36) ? 16'b11011011100110://54
(countsec == 8'h37) ? 16'b11011011101101://55
(countsec == 8'h38) ? 16'b11011011111101://56
(countsec == 8'h39) ? 16'b11011010000111://57
(countsec == 8'h3a) ? 16'b11011011111111://58
(countsec == 8'h3b) ? 16'b11011011101111://59
16'b01111110111111;
always @ (posedge slow_clk[N-1] or posedge outm)
if (outm)
countmin <= countmin + 8'b1;
else if (countmin == 8'b00111011 && countsec == 8'b00111011) countmin <= 8'b0;
else if (countmin != 00111011 && countsec == 8'b00111011) countmin <= countmin + 8'b1;
else countmin <= countmin;
assign segmin = (countmin == 8'h0) ? 16'b01111110111111:
(countmin == 8'h1) ? 16'b01111110000110: //1 0000110 0111111
(countmin == 8'h2) ? 16'b01111111011011: //2 1011011
(countmin == 8'h3) ? 16'b01111111001111: //3 1001111
(countmin == 8'h4) ? 16'b01111111100110: //4 1100110
(countmin == 8'h5) ? 16'b01111111101101: //5 1101101
(countmin == 8'h6) ? 16'b01111111111101: //6 1111101
(countmin == 8'h7) ? 16'b01111110000111: //7 0000111
(countmin == 8'h8) ? 16'b01111111111111: //8 1111111
(countmin == 8'h9) ? 16'b01111111101111: //9 1101111
(countmin == 8'ha) ? 16'b00001100111111: //10
(countmin == 8'hb) ? 16'b00001100000110: //11
(countmin == 8'hc) ? 16'b00001101011011: //12
(countmin == 8'hd) ? 16'b00001101001111: //13
(countmin == 8'he) ? 16'b00001101100110: //14
(countmin == 8'hf) ? 16'b00001101101101: //15
(countmin == 8'h10) ? 16'b00001101111101://16
(countmin == 8'h11) ? 16'b00001100000111://17
(countmin == 8'h12) ? 16'b00001101111111://18
(countmin == 8'h13) ? 16'b00001101101111://19
(countmin == 8'h14) ? 16'b10110110111111://20
(countmin == 8'h15) ? 16'b10110110000110://21
(countmin == 8'h16) ? 16'b10110111011011://22
(countmin == 8'h17) ? 16'b10110111001111://23
(countmin == 8'h18) ? 16'b10110111100110://24
(countmin == 8'h19) ? 16'b10110111101101://25
(countmin == 8'h1a) ? 16'b10110111111101://26
(countmin == 8'h1b) ? 16'b10110110000111://27
(countmin == 8'h1c) ? 16'b10110111111111://28
(countmin == 8'h1d) ? 16'b10110111101111://29
(countmin == 8'h1e) ? 16'b10011110111111://30
(countmin == 8'h1f) ? 16'b10011110000110://31
(countmin == 8'h20) ? 16'b10011111011011://32
(countmin == 8'h21) ? 16'b10011111001111://33
(countmin == 8'h22) ? 16'b10011111100110://34
(countmin == 8'h23) ? 16'b10011111101101://35
(countmin == 8'h24) ? 16'b10011111111101://36
(countmin == 8'h25) ? 16'b10011110000111://37
(countmin == 8'h26) ? 16'b10011111111111://38
(countmin == 8'h27) ? 16'b10011111101111://39
(countmin == 8'h28) ? 16'b11001100111111://40
(countmin == 8'h29) ? 16'b11001100000110://41
(countmin == 8'h2a) ? 16'b11001101011011://42
(countmin == 8'h2b) ? 16'b11001101001111://43
(countmin == 8'h2c) ? 16'b11001101100110://44
(countmin == 8'h2d) ? 16'b11001101101101://45
(countmin == 8'h2e) ? 16'b11001101111101://46
(countmin == 8'h2f) ? 16'b11001100000111://47
(countmin == 8'h30) ? 16'b11001101111111://48
(countmin == 8'h31) ? 16'b11001101101111://49
(countmin == 8'h32) ? 16'b11011010111111://50
(countmin == 8'h33) ? 16'b11011010000110://51
(countmin == 8'h34) ? 16'b11011011011011://52
(countmin == 8'h35) ? 16'b11011011001111://53
(countmin == 8'h36) ? 16'b11011011100110://54
(countmin == 8'h37) ? 16'b11011011101101://55
(countmin == 8'h38) ? 16'b11011011111101://56
(countmin == 8'h39) ? 16'b11011010000111://57
(countmin == 8'h3a) ? 16'b11011011111111://58
(countmin == 8'h3b) ? 16'b11011011101111://59
16'b11011010111111;
always @ (posedge slow_clk[N-1] or posedge outh)
if (outh) begin
counthr <= counthr + 8'b1;
end
else if(counthr != 8'b00001100 && countmin == 8'b00111011 && countsec == 8'b00111011) counthr <= counthr + 8'b1;
else if (counthr == 8'b00001100 && countmin == 8'b00111011 && countsec == 8'b00111011 ) counthr <= 8'b1;
else counthr <= counthr;
assign seghr = (counthr == 8'h1) ? 16'b01111110000110: //1 0000110 0111111
(counthr == 8'h2) ? 16'b01111111011011: //2 1011011
(counthr == 8'h3) ? 16'b01111111001111: //3 1001111
(counthr == 8'h4) ? 16'b01111111100110: //4 1100110
(counthr == 8'h5) ? 16'b01111111101101: //5 1101101
(counthr == 8'h6) ? 16'b01111111111101: //6 1111101
(counthr == 8'h7) ? 16'b01111110000111: //7 0000111
(counthr == 8'h8) ? 16'b01111111111111: //8 1111111
(counthr == 8'h9) ? 16'b01111111101111: //9 1101111
(counthr == 8'ha) ? 16'b00001100111111: //10
(counthr == 8'hb) ? 16'b00001100000110: //11
(counthr == 8'hc) ? 16'b00001101011011: //12
16'b01111110000110;
endmodule
答案 0 :(得分：2)
您的设计与multiple clocks domains（clk，slow_clk2 [M-1]和slow_clk [N-1]）不同步。我想你不想在你的设计中管理clock domains crossing。我错了吗？
您设计中的所有过程（始终为@）都应与clk信号切换。 要解决您的问题，您应该检测slow_clk2 [M-1]和slow_clk [M-1]的上升沿，如下所示
always @ (posedge clk)
begin
if(slow_clk2_old != slow_clk2[M-1] and slow_clk2[M-1] == 1'b1)
slow_clk2_rise <= 1'b1;
else
slow_clk2_rise <= 1'b0;
slow_clk2_old <= slow_clk2[M-1]
end
并使用你的信号slow_clk2_rise（而不是posedge ......）：
always @ (posedge clk) // all your synchronous process must toggle on clk
begin
if (slow_clk2_rise)
begin
delay <= delay << 1;
delay2 <= delay2 << 1;
delay[0] <= ~minbtn;
delay2[0] <= ~hrbtn;
end
end
对slow_clk [M-1]
执行相同的操作