// 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]; ...
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 are not synthesisable and these example are only for the test benches. ...
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...
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;o2=0;o3=0;o4=0;o5=0;o6=0;#10in=1;#10in=0;#10in=1;#3in=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)。
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。
We avoid this mismatch by modifying our testbench. We feel the complexity of transforming blocking to non-blocking assignment as well as testbench mismatch justify our decision to imple-ment only non-blocking assignment in our Verilog Im-plicit to One-hot (VITO) preprocessor. 展开 年份: 2008 ...
问题出现在最后一句：Y<=8‘b0
Non-Blocking Assignments (#2) The reason there are blocking assignments is to make it possible to use the result of the assigment in the same clock cycle as the assignment itself. Example: // OR,OR to mem,OR to Dn if(decoder_alu_reg[0]) result[31:0] = operand1[31:0] | operand...
Nonblocking simultaneous assignments to wires and, Non-Blocking assignments <= are for use in an always @(posedge clk) when inferring flip-flops. regs or logic types can be assigned inside always or … Tags: solve concurrent assignment error in verilog for the codeport is not permitted in mod...