照惯例,还是先将官方说明贴出来,verilog 2001关于blocking and non-blocking assignment 表述如下: blocking assignment :A blocking procedural assignment statement shall be executed before the execution of the statements that follow it in a sequential block (see 9.8.1). A blocking procedural assignment state...
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 ...
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。
这个意思是说,Verilog的RTL确实有必须要NBA来表达的模型。如果没有NBA,那么Assignment只有两种:用于wire的continous assignment和用于reg的procedural assignment,相当好理解。增加了Non-Blocking Assignment之后就大大的复杂化了。如果需要把DFF拆开看值的传递,则层次处在Gate and Switch层,这个时候考虑a和b值交换不需要临时...
Also see Verilog Tutorial Blocking Vs Non Blocking We had presented some introductory tutorial on blocking and non blocking assignment. We will now present some real life issues, solution and best practices for blocking and non blocking assignment statements ...
还有一种带repeat循环的Intra-Assignment Delays的过程赋值,例如: always @(IN) OUT <= repeat(8) @(posedge clk) IN; 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;...
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)。
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 XST will fail and report an error. This occurs in ...
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