FPGA设计的电子时钟
FPGA设计的电子时钟，小时的数码管始终显示00，分与秒钟正常，我试着将小时与秒钟的位选调了一下位置在第三个case语句那里，这时小时走的就正常了，可是显示的是秒：分：时，正好弄到了，我估计是扫描那里出了问题，麻烦能帮我分析一下吗？module clock_ver1(clr_key,clk,segdat,sl);
input clr_key;//复位信号，低电平有效
input clk;//系统时钟20MHZ
outputsegdat;//八段数码管显示输出
outputsl;//数码管位选
//output spk;
//reg spk;//扬声器输出
regcount;//对系统时钟进行计数
regsec,min,hou;//分、秒的八位寄存器
regsegdat_reg;//数码管显示输出寄存器
regsl_reg;//数码管位选寄存器
regdisp_dat;//数码管分、秒显示
reg second;//分频后产生1HZ的秒信号
reg cn;//秒向分的进位，高有效
reg cn_hou;//分向时进位信号
//regmusic_count;//产生扬声器声音频率的分频计数器
//对系统时钟进行分频，产生1HZ信号
always@(posedge clk)
begin
count<=count+1'b1;
if(count==25'd99999)
begin
count<=25'h000000;
second<=~second;
end
end
//***********************************************************************//
//利用计数器的第十二、十三位选中分、秒
always@(count or sec or min or hou)
begin
case(count)
3'b000:disp_dat<=sec;
3'b001:disp_dat<=sec;
3'b010:disp_dat<=min;
3'b011:disp_dat<=min;
3'b100:disp_dat<=hou;
3'b101:disp_dat<=hou;
default: disp_dat <= 4'bx;
endcase
end
//************************************************************************//
//八段数码管显示输出
always@(disp_dat)
begin
case(disp_dat)
4'h0:segdat_reg<=8'hc0;
4'h1:segdat_reg<=8'hf9;
4'h2:segdat_reg<=8'ha4;
4'h3:segdat_reg<=8'hb0;
4'h4:segdat_reg<=8'h99;
4'h5:segdat_reg<=8'h92;
4'h6:segdat_reg<=8'h82;
4'h7:segdat_reg<=8'hf8;
4'h8:segdat_reg<=8'h80;
4'h9:segdat_reg<=8'h90;
default: segdat_reg <= 8'hx;
endcase
/*if((count==2'b10)&second)
segdat_reg=segdat_reg&8'b01111111;*/
end
//***************************************************************************//
//位选
always@(count)
begin
case(count)
3'b100:sl_reg<=6'b111110;
3'b101:sl_reg<=6'b111101;
3'b010:sl_reg<=6'b111011;
3'b011:sl_reg<=6'b110111;
3'b000:sl_reg<=6'b101111;
3'b001:sl_reg<=6'b011111;
default:sl_reg<=6'bx;
endcase
end
//****************************************************************************//
//秒计时
always@(posedge second or negedge clr_key)
begin
if(!clr_key)//复位
begin
sec<=8'h0;
cn<=0;
end
else
begin
cn<=0;
sec<=sec+1'd1;
if(sec==4'd9)//秒低位计到十
begin
sec<=4'd0;
sec<=sec+1'd1;
if(sec==4'd5 && sec==4'd9)//秒高位计到六
begin
sec<=4'd0;
cn<=1'd1;
end
end
end
end
//*******************************************************************//
//秒向分产生进位信号cn
always@(posedge cn or negedge clr_key)
begin
if(!clr_key)
begin
min<=8'h0;
cn_hou <=1'd 0;
end
else
begin
cn_hou <= 1'd0;
min<=min+1'd1;
if(min==4'd9)
begin
min<=4'd0;
min<=min+1'd1;
if(min==4'd5 && min == 4'd9)
begin
min<=4'd0;
cn_hou <= 1'd1;
end
end
end
end
//*****************************************************************
//分向时产生进位信号cn_hou
always@(posedge cn_hou or negedge clr_key)
begin
if(!clr_key)
begin
hou<=8'h0;
end
else
begin
// hou<=hou+4'd1;
if(hou==4'd9)
begin
hou<=4'd0;
hou<=hou+4'd1;
end
elseif(hou==4'd2 && hou==4'd3)
begin
hou<=8'h0;
end
else
hou<=hou+4'd1;
end
end
assign segdat=segdat_reg;
assign sl=sl_reg;
endmodule
Warning: Output pins are stuck at VCC or GND
Warning (13410): Pin "segdat" is stuck at VCC
Warning: Found 14 output pins without output pin load capacitance assignment
Info: Pin "segdat" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "segdat" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "segdat" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "segdat" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "segdat" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "segdat" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "segdat" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "segdat" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "sl" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "sl" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "sl" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "sl" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "sl" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Info: Pin "sl" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis
Warning: Following 1 pins have nothing, GND, or VCC driving datain port -- changes to this connectivity may change fitting results
Info: Pin segdat has VCC driving its datain port
Warning: Found pins functioning as undefined clocks and/or memory enables
Info: Assuming node "clk" is an undefined clock
Warning: Found 3 node(s) in clock paths which may be acting as ripple and/or gated clocks -- node(s) analyzed as buffer(s) resulting in clock skew
Info: Detected ripple clock "second" as buffer
Info: Detected ripple clock "cn" as buffer
Info: Detected ripple clock "cn_hou" as buffer
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