Don’t cares are not allowed in the "case" statement. Therefore casex or casez are required. Casex will automatically match any x or z with anything in the case statement. Casez will only match z’s -- x’s require an absolute match. Verilog interview Questions 24)Given the following Ver...
NOTE : As a good coding practice, there should be only one port identifier per line, as shown below Examples : Port Declaration 1 input clk ; // clock input 2 input [15:0] data_in ; // 16 bit data input bus 3 output [7:0] count ; // 8 bit counter output 4 inout data_bi...
Any code that contains the above constructs are not synthesizable, but within synthesizable constructs, bad coding could cause synthesis issues. I have seen codes where engineers code a flip-flop with both posedge of clock and negedge of clock in sensitivity list....
Verilog 的数据类型主要是线网和变量,即 wire, reg, integer,都是四值逻辑(0、1、x、z) 在verilog基础上,SV增加了二值逻辑(0、1)变量来简化运算, 包含 bit, byte, shortint, int, longint 变量。 SV中logic与verilog中的reg变量对应,为四值逻辑的无符号数;bit为二值逻辑的无符号数; byte, int, short...
(2) Enumeration 枚举类型,类似状态机 写了三个例子,包含枚举的声明、变量类型以及一些操作。 自定义一个枚举类型(traffic_lights),然后例化一个状态变量,monitor函数监控变量变化的时间($time)、变量名(.name),变量值 module enumeration
First ask yourself the questions: Why are the full_case parallel_case synthesis directives so dangerous? And is there a way to avoid the danger while retaining their positive capabilities? 2.1 The full_case parallel_case dangers The full_case and parallel_case directives are dangerous because ...
Zynq requires PS7 block PS7 [DRC ZPS7-1] PS7 block required: The PS7 cell must be used in this Zynq design in order to enable correct default configuration. I'm new at Verilog coding, so please let m know what is the problem....
NEVERput a blocking statement inside of a structural logic block. In other words, NEVER put an "=" inside of an always block. Even if you are only changing one output it is poor practice to use a blocking statement. ALWAYSuse a blocking statement when using the "assign" keyword. These ...
Let’s start with a simple class with a bit vector. The class has a parameter for the width of the vector. (Good programming practice is to always have a default for your parameters.) class Vector #(parameter WIDTH=1); bit [WIDTH-1:0] data; ...
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