EDA 数字时钟

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前言

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前面学习了基本的数字芯片逻辑编程，学会了计数器等，这次来一个做一个综合应用。数字时钟，采用数码管显示时分秒。

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一、数字时钟是什么？

数字时钟是一种以数字显示取代模拟表盘的钟表，它能够以数字的形式显示当前的时间，并且可以同时显示时、分、秒。此外，它通常具有对时、分、秒进行准确校准的功能。
示例：能用数码管显示 时分秒的时钟

二、EDA里面数码管的显示

1.元件模型

代码如下（示例）：

2.参考程序

代码如下（示例）：

module seg(clk,seg7,ledcom); input clk; // 假设系统提供的时钟 50Mhz output[7:0] seg7; //段 output[7:0] ledcom; //位选 reg[7:0] seg7; //alway 里面赋值要用reg数据 reg[20:0] cnt; reg[7:0] ledcom; always@(posedge clk) begin if(cnt==21'b1 1111 1111 1111 1111 1111) // 2的22减一 cnt<=0; else cnt<=cnt+1; end always@(cnt) //给位选 begin case(cnt[16:14]) // 14 15 16 000 ->111 前面13为 满进位 3'b000:ledcom<=8'b00000001;//0 只有一个位选为1 只有第一位数码管选中并显示 3'b001:ledcom<=8'b00000010;//1  3'b010:ledcom<=8'b00000100;//2  3'b011:ledcom<=8'b00001000;//3  3'b100:ledcom<=8'b00010000;//0  3'b101:ledcom<=8'b00;//1  3'b110:ledcom<=8'b0;//2  3'b111:ledcom<=8'b;//3  endcase end always@(cnt) //段码 begin case(cnt[16:14]) 3'b000:seg7<=8'b00000111;//0 同时给到段码 ，保证只有 第一个数码管亮  3'b001:seg7<=8'b;//1  3'b010:seg7<=8'b;//2 3'b011:seg7<=8'b;//3  3'b100:seg7<=8'b;//0  3'b101:seg7<=8'b;//1  3'b110:seg7<=8'b0;//2  3'b111:seg7<=8'b;//3  endcase end endmodule 

为了仿真改小了参数

module seg(clk,seg7,ledcom,cnt,en); input en; input clk; // 假设系统提供的时钟 50Mhz output[7:0] seg7; //段 output[7:0] ledcom; //位选 reg[7:0] seg7; //alway 里面赋值要用reg数据 output reg[8:0] cnt; reg[7:0] ledcom; always@(posedge clk) begin if(!en) cnt<=0; else if(cnt==8'b) // 2的22减一 cnt<=0; else cnt<=cnt+1; end always@(cnt) //给位选 begin case(cnt[7:5]) // 14 15 16 000 ->111 前面13为 满进位 3'b000:ledcom<=8'b00000001;//0 只有一个位选为1 只有第一位数码管选中并显示 3'b001:ledcom<=8'b00000010;//1  3'b010:ledcom<=8'b00000100;//2  3'b011:ledcom<=8'b00001000;//3  3'b100:ledcom<=8'b00010000;//0  3'b101:ledcom<=8'b00;//1  3'b110:ledcom<=8'b0;//2  3'b111:ledcom<=8'b;//3  default:ledcom<=8'b; endcase end always@(cnt) //段码 begin case(cnt[7:5]) 3'b000:seg7<=8'b00000111;//0 同时给到段码 ，保证只有 第一个数码管亮  3'b001:seg7<=8'b;//1  3'b010:seg7<=8'b;//2 3'b011:seg7<=8'b;//3  3'b100:seg7<=8'b;//0  3'b101:seg7<=8'b;//1  3'b110:seg7<=8'b0;//2  3'b111:seg7<=8'b;//3  default:seg7<=8'b; endcase end endmodule 

测试文件

 `timescale 1 ps/ 1 ps module seg_tb3(); // constants  // general purpose registers reg eachvec; // test vector input registers reg clk; reg en; // wires  wire [8:0] cnt; wire [7:0] ledcom; wire [7:0] seg7; // assign statements (if any)  seg i1 ( // port map - connection between master ports and signals/registers  .clk(clk), .cnt(cnt), .en(en), .ledcom(ledcom), .seg7(seg7) ); initial begin // code that executes only once  // insert code here --> begin  // --> end  #10 clk= 0; #100 en=0; #10 en=1; $display("Running testbench"); end always #10 clk=~clk; always // optional sensitivity list  // @(event1 or event2 or .... eventn)  begin // code executes for every event on sensitivity list  // insert code here --> begin  @eachvec; // --> end  end endmodule 

实际仿真测试元件图

3. 实验仿真波形

4.实验现象

5. 仿真问题

三、显示时钟

1. 时钟电路模块

2.参考程序

module watch(clk,reset,seg_r,dig_r); input clk; input reset; output[7:0] seg_r; output[7:0] dig_r; reg[25:0] count; reg[15:0] hour; reg sec; reg[4:0] disp_dat; reg[7:0] seg_r; reg[7:0] dig_r; always @(posedge clk) begin count = count + 1'b1; if(count == 26'd) begin count = 26'd0; sec = ~sec; end end always @(posedge sec) begin if(reset==0) hour[15:0]=0; else begin hour[3:0] = hour[3:0]+1'b1; if(hour[3:0] == 4'ha) begin hour[3:0] = 4'h0; hour[7:4] = hour[7:4]+1'b1; if(hour[7:4] == 4'h6) begin hour[7:4] = 4'h0; hour[11:8] = hour[11:8] + 1'b1; if(hour[11:8] ==4'ha) begin hour[11:8] = 4'h0; hour[15:12] = hour[15:12] + 1'b1; if(hour[15:12] == 4'h6) hour[15:12] =4'h0; end end end end end always @(posedge clk) begin case(count[17:15]) 3'd0:disp_dat = hour[3:0]; 3'd1:disp_dat = hour[7:4]; 3'd3:disp_dat = hour[11:8]; 3'd4:disp_dat = hour[15:12]; endcase case(count[17:15]) 3'd0:dig_r = 8'b; 3'd1:dig_r = 8'b0; 3'd2:dig_r = 8'b00000000; 3'd3:dig_r = 8'b00010000; 3'd4:dig_r = 8'b00001000; 3'd5:dig_r = 8'b00000000; 3'd6:dig_r = 8'b00000000; 3'd7:dig_r = 8'b00000000; endcase end always @(posedge clk) begin case(disp_dat) 0:seg_r=8'b0; 1:seg_r=8'b00000111; 2:seg_r=8'b; 3:seg_r=8'b; 4:seg_r=8'b; 5:seg_r=8'b; 6:seg_r=8'b; 7:seg_r=8'b0; 8:seg_r=8'b; 9:seg_r=8'b; default:seg_r = 8'hff; endcase end endmodule 

3.tcl引脚配置

 # Setup pin setting for EP2C8 main board  set_global_assignment -name RESERVE_ALL_UNUSED_PINS "AS INPUT TRI-STATED" set_global_assignment -name ENABLE_INIT_DONE_OUTPUT OFF #clk set_location_assignment PIN_P1 -to clk #beep set_location_assignment PIN_T18 -to beep #led set_location_assignment PIN_H23 -to led\[0\] set_location_assignment PIN_G26 -to led\[1\] set_location_assignment PIN_G25 -to led\[2\] set_location_assignment PIN_K22 -to led\[3\] set_location_assignment PIN_G24 -to led\[4\] set_location_assignment PIN_G23 -to led\[5\] set_location_assignment PIN_P18 -to led\[6\] set_location_assignment PIN_N18 -to led\[7\] #rst set_location_assignment PIN_R4 -to reset #key set_location_assignment PIN_F26 -to key\[0\] set_location_assignment PIN_F25 -to key\[1\] set_location_assignment PIN_J20 -to key\[2\] set_location_assignment PIN_J21 -to key\[3\] set_location_assignment PIN_F23 -to key\[4\] set_location_assignment PIN_F24 -to key\[5\] set_location_assignment PIN_E25 -to key\[6\] set_location_assignment PIN_E26 -to key\[7\] #seg7led set_location_assignment PIN_K19 -to ledcom\[0\] set_location_assignment PIN_K18 -to ledcom\[1\] set_location_assignment PIN_H19 -to ledcom\[2\] set_location_assignment PIN_H26 -to ledcom\[3\] set_location_assignment PIN_H25 -to ledcom\[4\] set_location_assignment PIN_J24 -to ledcom\[5\] set_location_assignment PIN_J23 -to ledcom\[6\] set_location_assignment PIN_H24 -to ledcom\[7\] set_location_assignment PIN_K21 -to seg7\[0\] set_location_assignment PIN_J26 -to seg7\[1\] set_location_assignment PIN_J25 -to seg7\[2\] set_location_assignment PIN_L20 -to seg7\[3\] set_location_assignment PIN_L21 -to seg7\[4\] set_location_assignment PIN_K24 -to seg7\[5\] set_location_assignment PIN_L23 -to seg7\[6\] set_location_assignment PIN_K23 -to seg7\[7\] #PS2 set_location_assignment PIN_U23 -to data set_location_assignment PIN_P24 -to kbclk #lcd128*64 set_location_assignment PIN_R19 -to rs1 set_location_assignment PIN_U21 -to rs2 set_location_assignment PIN_U20 -to rs set_location_assignment PIN_T19 -to en set_location_assignment PIN_U24 -to rw set_location_assignment PIN_V26 -to dat\[0\] set_location_assignment PIN_V25 -to dat\[1\] set_location_assignment PIN_V24 -to dat\[2\] set_location_assignment PIN_V23 -to dat\[3\] set_location_assignment PIN_W26 -to dat\[4\] set_location_assignment PIN_W25 -to dat\[5\] set_location_assignment PIN_W23 -to dat\[6\] set_location_assignment PIN_W24 -to dat\[7\] #rxd set_location_assignment PIN_H24 -to rxd set_location_assignment PIN_H26 -to txd set_location_assignment PIN_T23 -to rxd_usb set_location_assignment PIN_P17 -to txd_usb #VGA  set_location_assignment PIN_R25 -to hs set_location_assignment PIN_T22 -to vs set_location_assignment PIN_V25 -to red set_location_assignment PIN_V24 -to grn set_location_assignment PIN_T24 -to blu #inter set_location_assignment PIN_AE4 -to inter1_1[0] set_location_assignment PIN_AC6 -to inter1_1[1] set_location_assignment PIN_AE5 -to inter1_1[2] set_location_assignment PIN_AD7 -to inter1_1[3] set_location_assignment PIN_AC7 -to inter1_1[4] set_location_assignment PIN_Y10 -to inter1_1[5] set_location_assignment PIN_AD8 -to inter1_1[6] set_location_assignment PIN_AA10 -to inter1_1[7] set_location_assignment PIN_AE7 -to inter1_1[8] set_location_assignment PIN_AF8 -to inter1_1[9] set_location_assignment PIN_AC9 -to inter1_1[10] set_location_assignment PIN_AF9 -to inter1_1[11] set_location_assignment PIN_AE10 -to inter1_1[12] set_location_assignment PIN_AE12 -to inter1_1[13] set_location_assignment PIN_AE11 -to inter1_1[14] set_location_assignment PIN_Y12 -to inter1_1[15] set_location_assignment PIN_V13 -to inter1_1[16] set_location_assignment PIN_AC12 -to inter1_1[17] set_location_assignment PIN_W17 -to inter1_1[18] set_location_assignment PIN_AE19 -to inter1_1[19] set_location_assignment PIN_AF18 -to inter1_1[20] set_location_assignment PIN_AD17 -to inter1_1[21] set_location_assignment PIN_AF17 -to inter1_1[22] set_location_assignment PIN_AC16 -to inter1_1[23] set_location_assignment PIN_AC15 -to inter1_1[24] set_location_assignment PIN_Y15 -to inter1_1[25] set_location_assignment PIN_Y13 -to inter1_1[26] set_location_assignment PIN_AD15 -to inter1_1[27] set_location_assignment PIN_AD19 -to inter1_1[28] set_location_assignment PIN_AA18 -to inter1_1[29] set_location_assignment PIN_U17 -to inter1_1[30] set_location_assignment PIN_AE21 -to inter1_1[31] set_location_assignment PIN_AB20 -to inter1_1[32] set_location_assignment PIN_V18 -to inter1_1[33] set_location_assignment PIN_AF22 -to inter1_1[34] set_location_assignment PIN_AD22 -to inter1_1[35] set_location_assignment PIN_AE23 -to inter1_1[36] set_location_assignment PIN_AF4 -to inter1_2[0] set_location_assignment PIN_AD4 -to inter1_2[1] set_location_assignment PIN_AF5 -to inter1_2[2] set_location_assignment PIN_V10 -to inter1_2[3] set_location_assignment PIN_W8 -to inter1_2[4] set_location_assignment PIN_AF6 -to inter1_2[5] set_location_assignment PIN_AC8 -to inter1_2[6] set_location_assignment PIN_AA9 -to inter1_2[7] set_location_assignment PIN_AF7 -to inter1_2[8] set_location_assignment PIN_W11 -to inter1_2[9] set_location_assignment PIN_AC10 -to inter1_2[10] set_location_assignment PIN_AD10 -to inter1_2[11] set_location_assignment PIN_AF10 -to inter1_2[12] set_location_assignment PIN_AE13 -to inter1_2[13] set_location_assignment PIN_AA11 -to inter1_2[14] set_location_assignment PIN_V11 -to inter1_2[15] set_location_assignment PIN_U12 -to inter1_2[16] set_location_assignment PIN_AD12 -to inter1_2[17] set_location_assignment PIN_AC18 -to inter1_2[18] set_location_assignment PIN_AF19 -to inter1_2[19] set_location_assignment PIN_Y16 -to inter1_2[20] set_location_assignment PIN_AC17 -to inter1_2[21] set_location_assignment PIN_W16 -to inter1_2[22] set_location_assignment PIN_AD16 -to inter1_2[23] set_location_assignment PIN_AB15 -to inter1_2[24] set_location_assignment PIN_Y14 -to inter1_2[25] set_location_assignment PIN_AA13 -to inter1_2[26] set_location_assignment PIN_AE15 -to inter1_2[27] set_location_assignment PIN_AC19 -to inter1_2[28] #clk input #set_location_assignment PIN_AE14 -to inter1_2[29] set_location_assignment PIN_AA20 -to inter1_2[30] set_location_assignment PIN_AF21 -to inter1_2[31] set_location_assignment PIN_AE20 -to inter1_2[32] set_location_assignment PIN_W19 -to inter1_2[33] set_location_assignment PIN_AB21 -to inter1_2[34] set_location_assignment PIN_AD23 -to inter1_2[35] set_location_assignment PIN_R2 -to inter1_2[36] #SDRAM set_location_assignment PIN_AA6 -to DRAM_ADDR[11] set_location_assignment PIN_AA7 -to DRAM_ADDR[10] set_location_assignment PIN_AC3 -to DRAM_ADDR[9] set_location_assignment PIN_AB4 -to DRAM_ADDR[8] set_location_assignment PIN_AB3 -to DRAM_ADDR[7] set_location_assignment PIN_AE3 -to DRAM_ADDR[6] set_location_assignment PIN_AE2 -to DRAM_ADDR[5] set_location_assignment PIN_AD3 -to DRAM_ADDR[4] set_location_assignment PIN_AD2 -to DRAM_ADDR[3] set_location_assignment PIN_Y5 -to DRAM_ADDR[2] set_location_assignment PIN_AA5 -to DRAM_ADDR[1] set_location_assignment PIN_AC1 -to DRAM_ADDR[0] set_location_assignment PIN_AC2 -to DRAM_DATA[31] set_location_assignment PIN_AA3 -to DRAM_DATA[30] set_location_assignment PIN_AA4 -to DRAM_DATA[29] set_location_assignment PIN_AB1 -to DRAM_DATA[28] set_location_assignment PIN_AB2 -to DRAM_DATA[27] set_location_assignment PIN_W6 -to DRAM_DATA[26] set_location_assignment PIN_V7 -to DRAM_DATA[25] set_location_assignment PIN_T8 -to DRAM_DATA[24] set_location_assignment PIN_R8 -to DRAM_DATA[23] set_location_assignment PIN_Y4 -to DRAM_DATA[22] set_location_assignment PIN_Y3 -to DRAM_DATA[21] set_location_assignment PIN_AA1 -to DRAM_DATA[20] set_location_assignment PIN_AA2 -to DRAM_DATA[19] set_location_assignment PIN_V6 -to DRAM_DATA[18] set_location_assignment PIN_V5 -to DRAM_DATA[17] set_location_assignment PIN_Y1 -to DRAM_DATA[16] set_location_assignment PIN_W3 -to DRAM_DATA[15] set_location_assignment PIN_W4 -to DRAM_DATA[14] set_location_assignment PIN_U5 -to DRAM_DATA[13] set_location_assignment PIN_U7 -to DRAM_DATA[12] set_location_assignment PIN_U6 -to DRAM_DATA[11] set_location_assignment PIN_W1 -to DRAM_DATA[10] set_location_assignment PIN_W2 -to DRAM_DATA[9] set_location_assignment PIN_V3 -to DRAM_DATA[8] set_location_assignment PIN_V4 -to DRAM_DATA[7] set_location_assignment PIN_T6 -to DRAM_DATA[6] set_location_assignment PIN_T7 -to DRAM_DATA[5] set_location_assignment PIN_V2 -to DRAM_DATA[4] set_location_assignment PIN_V1 -to DRAM_DATA[3] set_location_assignment PIN_U4 -to DRAM_DATA[2] set_location_assignment PIN_U3 -to DRAM_DATA[1] set_location_assignment PIN_U10 -to DRAM_DATA[0] set_location_assignment PIN_R7 -to DRAM_BA[1] set_location_assignment PIN_R6 -to DRAM_BA[0] set_location_assignment PIN_U9 -to DRAM_DQM[3] set_location_assignment PIN_U1 -to DRAM_DQM[2] set_location_assignment PIN_U2 -to DRAM_DQM[1] set_location_assignment PIN_T4 -to DRAM_DQM[0] set_location_assignment PIN_T3 -to DRAM_CAS set_location_assignment PIN_T2 -to DRAM_CKE set_location_assignment PIN_P7 -to DRAM_CS set_location_assignment PIN_T9 -to DRAM_WE set_location_assignment PIN_T10 -to DRAM_RAS set_location_assignment PIN_P6 -to DRAM_CLK #FLASH set_location_assignment PIN_C5 -to FLASH_ADDR[21] set_location_assignment PIN_C6 -to FLASH_ADDR[20] set_location_assignment PIN_A4 -to FLASH_ADDR[19] set_location_assignment PIN_B4 -to FLASH_ADDR[18] set_location_assignment PIN_A5 -to FLASH_ADDR[17] set_location_assignment PIN_B5 -to FLASH_ADDR[16] set_location_assignment PIN_B6 -to FLASH_ADDR[15] set_location_assignment PIN_A6 -to FLASH_ADDR[14] set_location_assignment PIN_C4 -to FLASH_ADDR[13] set_location_assignment PIN_D5 -to FLASH_ADDR[12] set_location_assignment PIN_K9 -to FLASH_ADDR[11] set_location_assignment PIN_J9 -to FLASH_ADDR[10] set_location_assignment PIN_E8 -to FLASH_ADDR[9] set_location_assignment PIN_H8 -to FLASH_ADDR[8] set_location_assignment PIN_H10 -to FLASH_ADDR[7] set_location_assignment PIN_G9 -to FLASH_ADDR[6] set_location_assignment PIN_F9 -to FLASH_ADDR[5] set_location_assignment PIN_D7 -to FLASH_ADDR[4] set_location_assignment PIN_C7 -to FLASH_ADDR[3] set_location_assignment PIN_D6 -to FLASH_ADDR[2] set_location_assignment PIN_B7 -to FLASH_ADDR[1] set_location_assignment PIN_A7 -to FLASH_ADDR[0] set_location_assignment PIN_D8 -to FLASH_DATA[15] set_location_assignment PIN_C8 -to FLASH_DATA[14] set_location_assignment PIN_F10 -to FLASH_DATA[13] set_location_assignment PIN_G10 -to FLASH_DATA[12] set_location_assignment PIN_D9 -to FLASH_DATA[11] set_location_assignment PIN_C9 -to FLASH_DATA[10] set_location_assignment PIN_B8 -to FLASH_DATA[9] set_location_assignment PIN_A8 -to FLASH_DATA[8] set_location_assignment PIN_H11 -to FLASH_DATA[7] set_location_assignment PIN_H12 -to FLASH_DATA[6] set_location_assignment PIN_F11 -to FLASH_DATA[5] set_location_assignment PIN_E10 -to FLASH_DATA[4] set_location_assignment PIN_B9 -to FLASH_DATA[3] set_location_assignment PIN_A9 -to FLASH_DATA[2] set_location_assignment PIN_C10 -to FLASH_DATA[1] set_location_assignment PIN_D10 -to FLASH_DATA[0] set_location_assignment PIN_D11 -to FLASH_OE set_location_assignment PIN_B10 -to FLASH_CE set_location_assignment PIN_A10 -to FLASH_WE set_location_assignment PIN_G11 -to FLASH_RST # usb-uart set_location_assignment PIN_R2 -to USB_UART_RX set_location_assignment PIN_R3 -to USB_UART_TX 

复制后保存为tcl后缀的文件，保留IO口

4.仿真波形

5.实验效果

总结

提示：这里对文章进行总结：