在Verilog中,input和output分别用于定义模块的输入端口和输出端口。input用于接收外部信号或者其它模块输出的信号,而output用于向外部传递数据。通过input和output定义的端口,模块之间可以进行数据传输,实现各种计算和控制任务。
函数(function)定义格式: function [<lower>:<upper>] <output_name> ; input <name>; begin <statements> end endfunction 任务(task)定义格式: // A task is a subroutine with any number of input, output or inout // arguments and may contain timing controls task <task_name>; input <input_...
5.6.1 带有output和inout形参的函数 Functions with output and inout formal arguments 传统Verilog的函数只能带有input参数。SystemVerilog允许函数带有output和inout参数,同任务一样。这一增强对void函数非常重要。 5.6.2 void函数 void function SystemVerilog允许将函数声明为void,指示该函数不返回任何值(但可赋值给ou...
◼ 基本逻辑门关键字是Verilog HDL预定义的逻辑门,包括and、or、not、xor、nand、nor等。 ◼ Verilog HDL内置了26个基本元件,其中14个门级元件,12个开关级元件。 调用门原语句法: gate_keyword<instance>(output,input1,...,inputn ); module gates(input a,b,c,d,output o);//assign o=!(a&b&c&...
主要是格式的问题，分开来写更直观，方便自己和其它人阅读，不容易出错。实际设计的端口可能有好几十个，全挤在一团写不利于以后升级维护。而且分开写还能够在后面对端口进行注释，百利而无一害。
Priority encoder with casez 一、问题描述 Build a priority encoder for 8-bit inputs. Given an 8-bit vector, the output should report the first (least significant) bit in the vector that is 1. Report zero if the input vector has no bits that are high. For example, the input 8'b1001000...
clocking clock1 @(posedge clk1); default input #2ns output #3ns; input #1step a1; input a2; output #5ns b1; endclocking Skew value of #0 A skew value of #0 changes the way input values are sampled and output values are synchronized, even though both will still be done at the si...
input Ain, Bin, Cin; output Sum, Cout; wire Sum; wire Cout; assign Sum = Ain ^ Bin ^ Cin; assign Cout = (Ain & Bin) | (Bin & Cin) | (Ain & Cin); endmodule 1. 2. 3. 4. 5. 6. 7. 8. module adder_carry_para#(parameter N=4) ...
06.Create a module that implements an AND gate. moduletop_module(inputa,inputb,outputout );assignout=a&&b;endmodule 07.Create a module that implements a NOR gate. A NOR gate is an OR gate with its output inverted. A NOR function needs two operators when written in Verilog. ...
output[2*S:1] R ; input[S:1] A,B ; reg[2*S:1] R ; integer i; always @(A or B) begin R=0 ; for(i=1; i<=S; i=i+1) if(B[i]) R=R+(A<<(i-1)); end endmodule 【例2-15】 module MULT4B (R,A,B);