Quartus II 警告问题，求解！

orange-208 · 发表于 2012-9-10 20:18:05

本帖最后由 orange-208 于 2012-9-10 20:19 编辑

警告如下：

Warning (12125): Using design file traffic_state.v, which is not specified as a design file for the current project, but contains definitions for 1 design units and 1 entities in project
Info (12023): Found entity 1: traffic_state
Warning (10240): Verilog HDL Always Construct warning at traffic_state.v(40): inferring latch(es) for variable "count_H", which holds its previous value in one or more paths through the always construct
Warning (10240): Verilog HDL Always Construct warning at traffic_state.v(40): inferring latch(es) for variable "count_L", which holds its previous value in one or more paths through the always construct
Warning (10240): Verilog HDL Always Construct warning at traffic_state.v(40): inferring latch(es) for variable "flag", which holds its previous value in one or more paths through the always construct
Warning (10240): Verilog HDL Always Construct warning at traffic_state.v(40): inferring latch(es) for variable "red_1", which holds its previous value in one or more paths through the always construct
Warning (10240): Verilog HDL Always Construct warning at traffic_state.v(40): inferring latch(es) for variable "yellow_1", which holds its previous value in one or more paths through the always construct
Warning (10240): Verilog HDL Always Construct warning at traffic_state.v(40): inferring latch(es) for variable "green_1", which holds its previous value in one or more paths through the always construct
Warning (10240): Verilog HDL Always Construct warning at traffic_state.v(40): inferring latch(es) for variable "red_2", which holds its previous value in one or more paths through the always construct
Warning (10240): Verilog HDL Always Construct warning at traffic_state.v(40): inferring latch(es) for variable "yellow_2", which holds its previous value in one or more paths through the always construct
Warning (10240): Verilog HDL Always Construct warning at traffic_state.v(40): inferring latch(es) for variable "green_2", which holds its previous value in one or more paths through the always construct
Warning (13012): Latch traffic_state:U2|flag has unsafe behavior
Warning (13013): Ports D and ENA on the latch are fed by the same signal traffic_state:U2|flag
Warning (13012): Latch traffic_state:U2|count_H[0] has unsafe behavior
Warning (13013): Ports D and ENA on the latch are fed by the same signal traffic_state:U2|flag
Warning (13012): Latch traffic_state:U2|count_H[1] has unsafe behavior
Warning (13013): Ports D and ENA on the latch are fed by the same signal traffic_state:U2|flag
Warning (13012): Latch traffic_state:U2|count_H[2] has unsafe behavior
Warning (13013): Ports D and ENA on the latch are fed by the same signal traffic_state:U2|flag
Warning (13012): Latch traffic_state:U2|count_H[3] has unsafe behavior
Warning (13013): Ports D and ENA on the latch are fed by the same signal traffic_state:U2|flag

高手留步！

orange-208 · 发表于 2012-9-10 21:18:04

顶起！

zxq6 · 发表于 2012-9-11 08:10:32

警告通常不用去理会

玉草夕林 · 发表于 2012-9-11 09:10:51

好像是有latch(es)吧……一般可能是if语句没有else，case语句没有default……latch最好不要出现……

orange-208 · 发表于 2012-9-11 09:24:00

玉草夕林发表于 2012-9-11 09:10
好像是有latch(es)吧……一般可能是if语句没有else，case语句没有default……latch最好不要出现…… ...

谢了！

orange-208 · 发表于 2012-9-11 09:49:10

代码如下：

module traffic_state
(
clk_1Hz, nrst, no_pass,

one_data, ten_data,
led_r1, led_y1, led_g1,
led_r2, led_y2, led_g2
);

input clk_1Hz, nrst;
input no_pass;

output [3:0]one_data, ten_data; //倒计时个位和十位
output led_r1, led_y1, led_g1;
output led_r2, led_y2, led_g2;

/*******************************/

parameter state_0 = 2'b00,
state_1 = 2'b01,
state_2 = 2'b10,
state_3 = 2'b11; //四种工作状态

/******************************交通状态转换*****************************/

reg red_1, yellow_1, green_1;
reg red_2, yellow_2, green_2;

reg flag; //倒计时赋值标志位
reg [1:0]CS, NS; //Current state, Next state
reg [3:0]count_H, count_L;

always @ ( posedge clk_1Hz or negedge nrst )
if ( !nrst )
CS <= state_0;
else
CS <= NS;

always @ ( CS, no_pass, flag, count_H, count_L )
begin
   NS = 2'bx;

   case( CS )
   state_0: //状态state_0, 主干道通行35s
      begin
if( !no_pass )
      begin
if( !flag )
      begin
state_0_init;
flag <= 1'b1;
      end
else
      begin
if( !count_H && !count_L ) //如果倒计时结束，则转至state_1状态
      begin
      NS <= state_1;
      flag <= 1'b0;
      count_H <= 4'b0000;
      count_L <= 4'b0000;
      end
         else if( !count_L  )
      begin
      count_L <= 4'b1001;
      count_H <= count_H-1'b1;
      end
else
      begin
count_L <= count_L-1'b1;
      end
      end
      end
      end

      state_1: //状态state_1,主干道黄灯倒计时5s
      begin
if( !no_pass )
      begin
if( !flag )
      begin
state_1_init;
flag <= 1'b0;
      end
         else
      begin
if( !count_L )
begin
      NS <= state_2;
      flag <= 1'b0;
      count_H <= 4'b0000;
      count_L <= 4'b0000;
end
else
begin
      count_L <= count_L-1'b1;
end
         end
end
end

      state_2: //状态state_2,支干道通行25s
begin
      if( !no_pass )
begin
      if( !flag )
begin
      flag <= 1'b1;
      state_2_init;
end
      else
begin
      if( !count_H && !count_L )
            begin
NS <= state_3;
flag <= 1'b0;
count_H <= 4'b0000;
count_L <= 4'b0000;
      end
      else if( !count_L )
      begin
count_L <= 4'b1001;
count_H <= count_H-1'b1;
      end
      else
      begin
count_L <= count_L-1'b1;
      end
end
end
end

   state_3: //状态state_3,支干道黄灯倒计时5s
      begin
if( !no_pass )
begin
   if( !flag )
begin
      flag <= 1'b1;
      state_3_init;
end
   else
begin
      if( !count_L ) //如果倒计时结束，则转到state_0状态
begin
      NS <= state_0;
      flag <= 1'b0;
      count_H <= 4'b0000;
      count_L <= 4'b0000;
end
      else
begin
      count_L <= count_L-1'b1;
end
end
end
      end

default:
NS <= state_0;
endcase
end

orange-208 · 发表于 2012-9-11 16:38:49

起来

Quartus II 警告问题，求解！

阿莫论坛20周年了！感谢大家的支持与爱护！！