problem while using `ifdef`elsif`else How to implement OR operation using defines?I have to build a circuit of an arithmetic right shift operator in verilog and include it in a verilog code of a simple computer I've written the code of the circuit with a module and it compiles The inputs to the multiplexer are the module_output_wire and something_else, the select signal is some_condition, = ifdef_directive ifndef`endif `define D00 `define D01 `ifdef D00 reg t00;
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Verilog ifdef or condition-There can be as many "else conditionaldirective" clauses as necessaryOnce a given condition is true, textiftrue is used and no other clause is used;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
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What is Ifdef Verilog?`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 105 106 107 # File 'lib/origen_verilog/preprocessor/processorrb', line 105 def on_else (node) # Do nothing, will be processed by the ifdef handler if required end #
Verilog has following conditional compiler directives `ifdef `else `elsif `endif `ifndef;If no condition is true then textiffalse is used The textiftrue and textiffalse can be any number of lines of text The syntax of the conditionaldirective is the same whether the conditional is simple or complex;`ifdef 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 defined, the compiler compiles the code (if any) following the optional `else directive
Please be sure to answer the questionProvide details and share your research!`endif `ifdef U00 reg f01;Email your comments about Synopsys documentation to doc@synopsyscom HDL Compiler for Verilog Reference Manual Version 0005, May 00
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Verilog converted to html by v2html (written by Costas Calamvokis) verilog conditional for conditional instanciation of module you can use `ifdef Defination 'else and in same file you have to include file like `include "user_definesv" and in user_definesv file you have to define your defination from which you want to instantiale module I havent tried this way for perticular thing but it may work here also Hth Hi I've just learned that in Verilog you can use an `ifdef statement that makes Quartus ignore the following code (until the next`endif) you can define a macro in the qsf file (or through the GUI) to decide which parts of code to ignore
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But avoid Asking for help, clarification, or responding to other answers The Verilog preprocessor was first standardized in Verilog , and has been improved with each subsequent standard Reviewing some of the changes Verilog 1995 `define MACRO `ifdef `else `endif `include Verilog 01 `define MACRO(arg) `ifndef `elsif `undef `line SystemVerilog 05 `` `" `\`" SystemVerilog 09Conditional compilation can be achieved with Verilog `ifdef and `ifndef keywords The keyword `ifdef simply tells the compiler to include the piece of code until the next `else or `endif if the given macro called FLAG is defined using a `define directive
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`ifndef U00 module should_be_true; Original Redmine Issue 3 from https//wwwveripoolorg Original Date Original Assignee Michael McNamara Noticed that while ifdef, else and endif indents properly, elsif did not Hence modified verilogmodeel to support `elsif indentation 2 Answers Its the conditional compilation directive that is used to include either optional or alternative lines of Verilog HDL source description during compilation The `ifdef checks for the definition of a macro If it is defined, then the lines following the `ifdef are included If the macro is not defined and an `else directive exists
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`endif `ifdef U00 reg f02;Edit, save, simulate, synthesize SystemVerilog, Verilog, VHDL and other HDLs from your web browser Verilog `ifdef/`else and `endif EDA Playground Loading`elsif D01 reg f00;
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The`ifdef,`else,`elsif, and`endif compiler directives work together in the following manner — When an `ifdef is encountered, the ifdeftext macro identifier is tested to see if it is defined as a text macro name using `define within the Verilog HDL source description 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 to Thanks for contributing an answer to Stack Overflow!
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`ifdef, `else, and `endif These directives can be used to decide which lines of Verilog code should be included for the compilation (Example 4) The `ifdef directive checks if a macro name that follows this directive is defined If it is, then all lines between `ifdef and `else will be included Verilog supports the following structure of preprocessing keywords `ifdef A `ifdef B `else `endif `elsif C `endif I'm looking for a syntax definition that allows nested folding of the individual elements of this structure, but allowing transparent syntax highlight within it (contains=ALL)Below are examples of the desired folding`define WIDTH 8 to avoid redefincation `ifdef can be used, `ifdef WIDTH // do nothing (better to use `ifndef) `else `define WIDTH 8 `endif `ifndef WIDTH `define WIDTH 8 `endif `ifdef can be used as ifelse `ifdef TYPE_1 `define WIDTH 8 `else `define WIDTH 32 `endif //`ifdef can also be used to avoid redefining/recompiling the module/class
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Verilog provides the `ifdef and `endif constructs to determine whether a macro is defined or not These constructs are used to define conditional compilation If the macro called out by the `ifdef command has been defined, that code will be compiledWhat are the conditional compiler directives in Verilog?Verilog ifelseif This conditional statement is used to make a decision on whether the statements within the if block should be executed or not If the expression evaluates to true (ie any nonzero value), all statements within that particular if block will be executed If it evaluates to false (zero or 'x' or 'z'), the statements inside if
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Icarus verilog does not interpred the `ifdef `endif combo in the same way as the verilog XL and/or ncverilog igor@ld112/tmp> iverilog definev defineAAAA defineAAAA No such file or directory igor@ld112/tmp> /aout AAAA not defined igor@ld112/tmp> iverilog definev igor@ld112/tmp> /aout AAAA not defined Using the switch D the test code works OKVerilog 1995 `define MACROdefine MACRO `ifdef `else `endif `include V il 01 Compared to "C"? These directives, as the name suggests, direct how the compiler will compile the code In Verilog, there are various compiler directives to set the timescale of simulation, control the compiler flow It is not necessary to include an `else directive with `ifdef or
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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 includedAnswer (1 of 4) code`define SYNTHESIS // Uncommented for synthesis (`define method 1) //`define SIMULATION //Uncommented for simulation `include some_headerv
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`ifdef SUB_IS_A_FOOBAR `define SUB_CELL foobar `else `define SUB_CELL foobiz `endif `SUB_CELL subcell (/*AUTOINST*/);For 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 fromIn the above case it behaves like an AND operationie,if both DEF_1 and DEF_2 are defined then only the block will get executedBut I want to implement OR operation which means if either DEF_1 or DEF_2 are defined,then only the block should get executedHow
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'ifdef, 'else, and 'endif Directives The 'ifdef, 'else, and 'endif directives allow the conditional inclusion of code Themacrosthatareargumentstothe'ifdefdirectivescanalsobe defined in the Verilog source file by use of the'definedirective In that case, there is no change in the invocation of the HDL Compiler to read in`define MACRO(args) `ifndef `elsif `undef `line – see the paper!SystemVerilog 05 `` `" `\`" SystemVerilog 09 `define MACRO(arg=default) `undefineall
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Verilog generate constructs are powerful ways to create configurable RTL that can have different behaviours depending on parameterization Generate loop allows code to be instantiated multiple times, controlled by an index Conditional generate, ifgenerate and casegenerate, can conditionally instantiate code`elsif D01 reg t01;`ifdef SYNTH 'endif `include 'resetall resets all compiler directives to default values 'define textmacro substitution 'timescale 1ns / 10ps specifies time unit/precision 'ifdef, 'else, 'endif conditional compilation 'include file inclusion
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Macros can be used to improve the readability and maintainability of the Verilog code `ifdef, `ifndef, `elsif, `else and `endif conditionally compiles Verilog code, depending on whether or not a specified macro is defined Any code that is not compiled must still be valid Verilog code `include includes the contents of another Verilog source fileHandles an else statement being encountered More void verilog_preprocessor_ifdef (char *macro_name, unsigned int lineno, ast_boolean is_ndef) Handles an ifdef statement being encountered More verilog_include_directive * verilog_preprocessor_include (char *filename, unsigned int lineNumber) Handles the encounter of an include directiveConditional compilation can be achieved with Verilog `ifdef and `ifndef keywords These keywords can appear anywhere in the design and can be nested one inside the other The keyword `ifdef simply tells the compiler to include the piece of code until the next `else or `endif if the given macro called FLAG is defined using a `define directive
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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 compiledIt 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(in4It's close, but there's gotchas Verilog 01 see the paper!
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4 The #else Directive The #else directive has the following syntax #else newline This directive delimits alternative source text to be compiled if the condition tested for in the corresponding #if, #ifdef, or #ifndef directive is false An #else directive is optional 5 The #elif Directive The #elif directive has the following syntax In Verilog, you can easily use the #ifdef preprocessor In VHDL, which is my first language, I can't replace it, specifically in this circumstance, with the generate statement which can't generate the parameters needed for the ports before starting anything in the blockIfelse, case, casex, casez These are used to describe the design functionality depending on the priority and parallel hardware requirements Yes No Compiler directives ('ifdef,'undef, 'define) Used during synthesis Yes No Bits and part select It is
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After an else or notConditional compilation Allows Verilog source code to be optionally included, based on whether or not macro_name has been defined using `define or an invocation option Examples `ifdef RTL wire y = a & b;The #ifdef, #ifndef , #elseif, #elif, #else, and
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