XuWenbo的博客

状态机要写成3段式的(这是最标准的写法)，即
         ……
        //build the state flops  
always @(posedge clk or negedge rst_n)          
         ……
             current_state <= next_state;
         ……
//state machine
         always @ (current_state or ...)
         ……
         case(current_state)
               ……
               S1:
                  if ...
                    next_state = S2;
               ……
         ……
        //outputs logic block
always @(current_state  or …)
            //default value
                a  =  1’b0;
                b  =  1’b0;
                c  =  1’b0;
                ……
               case(current_state)
                     S1:
                         a  =  1'b0;  
                     S2:
                         b  = 1'b1;
                     S3:
                         c  = 1'b1;
                     default:
                     ……
              endcase
              ……