1. What is the race condition in verilog? Ans :The situation when two expressions are allowed to execute at same instance of time without mentioning the order of execution. 2. List the levels of abstraction in verilog? Ans : 1. Behavioral level 2. Re…

1. What is clocking block? Ans: Clocking block can be declared using the keywords clocking and endclocking. A clocking block is mainly used in the testbench in order to         avoid race conditions. Clocking blocks are used to assemble all the signa…

comp.lang.javascript FAQ Version 32.2, Updated 2010-10-08, by Garrett Smith FAQ Notes 1 Meta-FAQ meta-questions 1.1 Which newsgroups deal with javascript? 1.2 What questions are on-topic for comp.lang.javascript? 1.3 What should I do before posting t…

1. Why do you write a program in Perl? Ans : Easy to use and fast execution since perl script undergoes only two phases like compile phase and run phase. 2. What is the difference between chop & chomp functions in perl? Ans : Chop removes last charac…

1.Which is the command used to find the available shells in your Operating System Linux ? Ans : $echo $shell 2.Which is the command used to view the environment variables? Ans: printenv 3. How do you recall last command from the history list in Cshel…

It seems my pgpool-II does not do load balancing. Why? First of all, pgpool-II' load balancing is "session base", not "statement base". That means, DB node selection for load balancing is decided at the beginning of session. So all SQL…

Google软件构建工具Bazel FAQ 本文是我的翻译,原文在这里.欢迎转载,转载请注名本文作者和原始链接 注:如果想了解Bazel的原理,可以看看我之前翻译的Google Blaze原理及使用方法介绍系列 Bazel是什么? Bazel是一个构建工具,即一个可以运行编译和测试来组装软件的工具,跟Make.Ant.Gradle.Buck.Pants和Maven一样. Bazel有什么特殊之处 Bazel是设计用来配合Google的软件开发模式.有以下几个特点: 多语言支持:Bazel支持Ja…

先以一位全加器为例:Xi.Yi代表两个加数,Cin是地位进位信号,Cout是向高位的进位信号.列表有:   Xi     Yi    Cin Sum Cout 0 0 0 0 0 0 0 1 1 0 0 1 0 1 0 0 1 1 0 1 1 0 0 1 0 1 0 1 0 1 1 1 0 0 1 1 1 1 1 1 由左边表格可知: Sum=X’Y'Cin+X'YCin'+XY'Cin'+XYCin=X'(Y⊕Cin)+X(Y⊙Cin)=X'(Y⊕Cin)+X(Y⊕Cin)'=X⊕Y⊕Cin…

所谓不同的抽象类别,实际上是指同一个物理电路,可以在不同层次上用Verilog语言来描述.如果只从行为功能的角度来描述某一电路模块,就称作行为模块.如果从电路结构的角度来描述该电路模块,就称作结构模块.根据抽象的级别将Verilog的模块分为5种不同的等级: 1)系统级 2)算法级 3)RTL级(register-transfer-level)4)门级 5)开关级. 对于数字系统的逻辑设计工程师而言:熟练地掌握门级.RTL级.算法级.系统级的描述是非常重要的. 对于电路基本元部件的设计者而言,则…

h Verilog HDL语言和C语言一样也提供编译预处理的功能.在Verilog中为了和一般的语句相区别,这些预处理语句以符号"`"开头,注意,这个字符位于主键盘的左上角,其对应的上键盘字符为"~",这个符号并不是单引号"'".这里简单介绍最常用的`define `include `timescale. 1)宏定义`define 用一个指定的标识符(名字)来代表一个字符串,其的一般形式为: `define 标识符(宏名) 字符串(宏内容) 如:…