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...
blocking與non-blocking是學習Verilog一個重要的關卡,若能掌握這四個原則,基本上就不會用錯。 Introduction 要徹底搞懂blocking和nonblocking老實說並不是很容易,需要一些篇幅(請參考(原創) 深入探討blocking與nonblocking (SOC) (Verilog))。在RTL級編碼中,若能掌握以下四個原則,基本上就不會誤用blocking與nonblocking: ...
blocking與non-blocking是學習Verilog一個重要的關卡,若能掌握這四個原則,基本上就不會用錯。 Introduction 要徹底搞懂blocking和nonblocking老實說並不是很容易,需要一些篇幅(請參考(原創) 深入探討blocking與nonblocking (SOC) (Verilog))。在RTL級編碼中,若能掌握以下四個原則,基本上就不會誤用blocking與nonblocking: ...
由于Verilog HDL是描述电路结构的硬件描述语言,加上nonblocking的并行性,更改上面的begin···end里面的内容不会影响描述电路的电路的结构。 在需要描述多个register assignment的语句中,使用nonblocking assignment,语句的前后顺序与仿真结果无关。 对于blocking assignment begin output1 = input1; output2 = output1; o...
Now we will write the same example using non blocking assignment `timescale 1ns/1ps module nonblocking; reg p,q,r ; initial begin p <= #10 1'b1;// Executed at time t = 10 units q <= #30 1'b0;// Executed at time t = 10 + 30 = 40 units r <= #20 1'b1;// Executed at...
// 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]; ...
在RTL级编码中，若能掌握以下四个原则，基本上就不会误用blocking与nonblocking：1.有clock的always区块要使用nonblocking。1 always@(posedge clk or negedge reset_n) begin2 if (!reset_n)3 counter <= 8'b00;4 else5 counter <= counter + 1;6 end2.无clock的always区块使用blocking。1 ...
官方文档原文传送门 https://www.verilogams.com/refman/modules/discrete-procedural/assignment.html?highlight=assign 和普通的C语言一样。ps.对于暂存，不要想存在哪里的问题，没必要了解。因为Verilog是硬件描述语言，这个是为了描述一些硬件中数据变化之类的行为。那么，左边的值什么时候发生改变，即赋值...
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 ...
Verilog Blocking and Nonblocking Assignment 官方文档原文传送门 https://www.verilogams.com/refman/modules/discrete-procedural/assignment.html?highlight=assign 阻塞式赋值(Blocking Assignment) 阻塞式赋值用法示例(使用=) a = b + c; a = #10 b + c; // 延迟10个时间单位 ...