// referencedesigner.com // 4 bit ring counter example module four_bit_ring_counter ( input clock, input reset, output [3:0] q ); reg[3:0] a; always @(posedge clock) if (reset) a = 4'b0001; else begin a <= a<<1; // Notice the non blocking assignment a[0] <=a[3]; ...
If there are multiple assignment statements in the always block in verilog then they can be done in two different ways 1. Blocking using = 2. Non Blocking using <= We will first consider an example usage of Blocking and non blocking assignments in initial statements. The initial statements ...
non-blocking assignment :The non blocking procedural assignment allows assignment scheduling without blocking the procedural flow. The non blocking procedural assignment statement can be used whenever several variable assignments within the same time step can be made without regard to order or dependence u...
可用于阻塞或非阻塞赋值。 为了能更好理解,代码加了一些$display,以显示语句执行的时间,据此统计次数 modulecomb_logic_assign16;bitin;bito1,o2,o3,o4,o5,o6;initialbeginin=0;o1=0;o2=0;o3=0;o4=0;o5=0;o6=0;#10in=1;#10in=0;#10in=1;#3in=0;#3in=1;#9in=0;endinitialbegin#60$stop...
Verilog里有连续赋值(Continuous assignment) ,过程赋值(Procedural assignment),还有过程连续赋值(Procedural Continuous assignment)。 过程赋值又有阻塞赋值和非阻塞赋值。 "=" 表示阻塞过程赋值(Blocking Procedural assignment), "<="表示非阻塞过程赋值(Non-blocking Procedural assignment)。
写的很清楚，是你在设计电路的时候将阻塞赋值与非阻塞赋值放在一起使用了，这种情况经常出现在always 块中。这说明你是一个初学verilog的beginner。解决办法，仔细看书，搞明白 = 和 <= 号的作用、区别和使用环境。
ao68000.v line 2841 shows result assigned with a non-blocking assignment. a068000.v line 2852 shows result assigned with a blocking assignment. I don't know what that the Altera synthesizer does with mixed assignment like this but Xilinx...
This page contains tidbits on writing FSM in verilog, difference between blocking and non blocking assignments in verilog, difference between wire and reg, metastability, cross frequency domain interfacing, all about resets, FIFO depth calculation,Typica