Verilog generate statement is a powerful construct for writing configurable, synthesizable RTL It can be used to create multiple instantiations of modules and code, or conditionally instantiate blocks of code However, many Verilog programmers often have questions about how to use Verilog generate effectivelyAnswer (1 of 4) code`define SYNTHESIS // Uncommented for synthesis (`define method 1) //`define SIMULATION //Uncommented for simulation `include some_headervVerilog has following conditional compiler directives The `ifdef compiler directive checks for the definition of a text_macro_name If the text_macro_name is defined, then the lines following the `ifdef directive are included
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Verilog ifdef o'ring-Preprocessorifdefminutia Subtle notes about or `define and `ifdef handling There are many subtleties related to `define and `ifdef that make my head hurt BOZO most of my testing was done on VerilogXL before I really knew much about NCVerilog It would be good to doublecheck all of these things on NCVerilog and make sure it behaves the same GNU Emacs (VerilogMode)) module m (`ifdef c_input c, `endif /*AUTOARG*/ // Inputs a, b) input a;
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Some Verilog designs use a `define statement, possibly located inside a file referenced by an `include statement, to control something managed with `ifdef or `ifndef Instead of using a `define statement, you can define the Verilog macro with a Quartus setting in the qsf file You can control the v('ifdef,'undef, 'define) Used during synthesis Yes No Bits and part select It is synthesizable and used for the bit or part select Yes No 400 Appendix I Synthesizable and NonSynthesizable VerilogUse negative numbers only as type integer or real !!!
`ifdef `else `endif Optionally includes lines of source code during compilation The `ifdef directive checks that a macro has been defined, and if so, compiles the code that follows If the macro has not been define, VerilogXL compiles `ifdef SUB_IS_A_FOOBAR `define SUB_CELL foobar `else `define SUB_CELL foobiz `endif `SUB_CELL subcell (/*AUTOINST*/);The Verilog hardware description language (HDL) became an IEEE standard in 1995 as IEEE Std It was designed to be simple, intuitive, and effective at multiple levels of abstraction in a standard textual format for a variety of design tools, including verification simulation, timing analysis, test analysis,
Verilog has following conditional compiler directives The `ifdef compiler directive checks for the definition of a text_macro_name If the text_macro_name is defined, then the lines following the `ifdef directive are included If the text_macro_name is not defined and an `else directive exists, then this source is compiled`ifdef c_input input c;Verilog has very simple data types and it's all defined by Verilog language (users cannot define their own data types in Verilog) Verilog has two main data types including net data types (for connecting components together such as wire (most popular), wor, wand, tri, trior, etc ) and variable data types (for temporary storage such as reg
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条件コンパイル `ifdef 〜 `else Verilog/SystemVerilogでは`ifdef 〜 `else文を記述することによってプログラムを条件コンパイルすることができる。下記に条件コンパイルの書式を示す。str1が定義済みなら記述1をコンパイルし、str2が定義済みなら記述2をコンパイルする。いずれも定義されていなければ verilog parameter module Note that the Verilog generate statement was added with the Verilog 01 standard and is not supported by all tools Generate should not be used if your design must be compiled by any unknown tools Without generate the best way to do conditional instantiation of modules in Verilog is with `ifdef PARAMETER and `endif surroundingThis answer is not useful Show activity on this post #if defined (CONDITION1) defined (CONDITION2) should work ) #ifdef is a bit less typing, but
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Vppreproc reads the Verilog files passed on the command line and outputs preprocessed output to standard out or the filename passed with o Note vppreproc was named vppp until release 3100, so if you're looking for vppp, this is the right replacement The vppp name conflicted with another nonVerilog related tool Verilog experts, but merit review As was just noted, the Verilog preprocessor is very similar to the C preprocessor, and many Verilog techniques directly correspond to C best practices Precedence The precedence problem occurs when a define is hastily created as follows `define OR(x,y) xyVerilog Compiler Directives // the source lines 3 `endif // end the construct `ifndef macro_name // like `ifdef except logic is reversed, // true if macro_name is undefined `timescale 1ns/1ns // units/precision for time eg for %t `celldefine // marks beginning of a cell `endcelldefine // marks end of a cell `default
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It looks like the person who created your Verilog example was using the C preprocessor to handle his defines and macros Your example shows #ifdef which will work for C The Verilog preprocessor uses the "accentgrave" character or backwardssinglequote ` It is in the far upperleft of my keyboard Try this `ifdef TRIAL c(in3), `else c(in4Ifdef macro then Statements will execute if the macro is defined end if If the boolean expression evaluates to true then the block of code inside the if statement is executed If not, then the first set of code after the end of the ifdef statement will be executed The ifdef checks the macros defined by using with define keywords There areLet us see different directives in detail Include directive Include directive is used when a module defined in a file needs to be included in another file This compiler directive will copy all the codes
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The Verification Community is eager to answer your UVM, SystemVerilog and Coverage related questions We encourage you to take an active role in the Forums by answering and commenting to any questions that you are able toFor this to work, you need to read the defines with the below at the bottom of your file Verilogmode will use the last definition of SUB_CELL to determine which one to pickup the pinlist fromIs inserted for the next processing phase Other standard compiler directives are listed below 40 System Tasks and Functions System taska are tool specific tasks and functions 'define OPCODEADD `ifdef SYNTH 'endif `include 'resetall resets all compiler directives to default values
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As is often the case when using #ifdef, I'm using #ifdef to distiguish compiler directives for the various platforms that I'm using or the various compilers of which I'm using to compile In my case, the 3 platforms are as follows GCC ALPHA CC In some cases in the code, I would like to precede the code with a statement such as the followingConditional Compilation (#if, #ifdef, #ifndef, #else, #elif,
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