怎么在状态机中加计数器？

houjibin

我想在状态机的单个状态中加入计数器进行计数，达到一定数值后跳转，该怎么写，求教！

waver412

Case B_state
if cnt=0 then
  This_st<=B_state;
  cnt<=cnt+1;
elsif cnt=20 then
  This_st<=Jump_state;
  cnt<=0;
else
   This_st<=B_state;
   cnt<=cnt+1;
end

这个模式就是用计数器进行跳转的

houjibin

好的，我试试，多谢了

houjibin

好像还是不行，我写的程序其中有计算器的一个分支是这样：
s1:begin        if (din==1'b1)
        begin
        Ns=cs;
                if(cnt==5'b0)//第50行

                cnt<=cnt+1;
                else if(cnt==5'b00100)//52行
                begin
                Ns=s2;
                cnt<=0;
                end
                else
                begin
                cnt<=cnt+1;
                Ns=cs;
                end
                end
        else
        Ns=s2;
end
结果报了一大推没见过的错误：
error：HDLCompilers:52 - "C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v" line 50 Illegal operand(s) of binary operator '=='Parsing C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v: 0.03

ERROR:HDLCompilers:71 - "C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v" line 50 Illegal condition expression in if statement
ERROR:HDLCompilers:106 - "C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v" line 51 Illegal left hand side of nonblocking assignment
ERROR:HDLCompilers:52 - "C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v" line 51 Illegal operand(s) of binary operator '+'
ERROR:HDLCompilers:107 - "C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v" line 51 Illegal right hand side of nonblocking assignment
ERROR:HDLCompilers:52 - "C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v" line 52 Illegal operand(s) of binary operator '=='
ERROR:HDLCompilers:71 - "C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v" line 52 Illegal condition expression in if statement
ERROR:HDLCompilers:106 - "C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v" line 55 Illegal left hand side of nonblocking assignment
ERROR:HDLCompilers:106 - "C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v" line 59 Illegal left hand side of nonblocking assignment
ERROR:HDLCompilers:52 - "C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v" line 59 Illegal operand(s) of binary operator '+'
ERROR:HDLCompilers:107 - "C:/Xilinx92i/MYEXERCISE/DDR/statemachine.v" line 59 Illegal right hand side of nonblocking assignment

dlm_dlm

你把阻塞和非阻塞赋值放一起了

weqlay

赋值问题

houjibin

不是这个问题，我试过了

dlm_dlm

先改了，再把error 贴出来

houjibin

改过以后问题，还是一样哦

xiaokira

会不会是不能在同一个进程中对同一个值（cnt）进行重复赋值呢？