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The iverilog command is the compiler/driver that takes the Verilog input and generates the output format, whether the simulation file or synthesis results This information is at least summarized in the iverilog man page distributed in typical installations, but here we try to include more detail 1 General 11 c 12 d 13 g 14 i 15 L 16 l 1The parameter works with sv, but not with Verilog Jun 21, 19 #10 adsee Super Moderator Staff member Joined Sep 10, 13 Messages 7,0 Helped 1,811 Reputation 3,632 Reaction score 1,772 Trophy points 1,393 Location USA Activity points 59,028// Fake out Verilogmode output b_out;

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Verilog ifdef parameter

Verilog ifdef parameter-`ifdef FLASH_IS_1MB `define FLASH_TEA //19s max for 1MB erase cycle `elsif FLASH_IS_512KB `define FLASH_TEA //12s max for 512KB erase cycle `elsif FLASH_IS_256KB `define FLASH_TEA //6s max for 256KB erase cycle `elsif FLASH_IS_128KB `define FLASH_TEA //4s max for 128KB erase cycle `endif · In the article, Parameters In Verilog, we will discuss the topics of single parameter override and multiple parameter override PARAMETERS The constants will be defined in a module by using keyword parameters The parameter defined things are not constants The defined parameter value can be changed in two ways module instantiation and defparam

Verilog Data Types

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 `By E Cerny 1, J Bergeron 2, M K Thottasseri 3 and T Anderson 4, Synopsys, Inc 1 Marlborough, USA;Conditional 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

 · `ifdef FILENAME_PATH `define FILENAME1 ``FILENAME_PATH / test1txt // fail what does double `` even do? · First, just ifdef fake outputs Verilogmode will see them, but no other tool will care This is cleanest for signals you can list onebyone, and are using Verilog 01 port lists or when you want those listed to still appear in a AUTOARG `ifdef NEVER output a_out;Verilog Parameters Verilog `ifdef `elsif Verilog Delay Control Verilog Inter/Intra Delay Verilog Hierarchical Reference Gate/Switch modeling Gate Level Modeling Gate Level Examples Gate Delays Switch Level Modeling UserDefined Primitives Simulation Verilog Simulation Basics Verilog Timescale Verilog Scheduling Regions Verilog Clock Generator System Tasks and Functions Verilog

 · Verilog lacks defines with a variable number of arguments, which for C was standardized recently in C992 This would be an excellent addition to allow wrapping $display functions Verilog adds default parameter values There are cases where this is useful, however it remains to be seen how widely used and supported this will becomeThe vppp name conflicted with another nonVerilog related tool VERILOG ARGUMENTS The following arguments are compatible with GCC, VCS and most Verilog programs definevarvalue =item Dvar=value Defines the given preprocessor symbolf file Read the specified file, and act as if all text inside it was specified as command line parametersParameters must be defined within module boundaries using the keyword parameter A parameter is a constant that is local to a module that can optionally be redefined on an instancebyinstance basis For parameterized modules, one or more parameter declarations typically precede the port declarations in a Verilog1995 style model, such as the simple register model in

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`define is used for global parameterization whereas parameter is generally used for local parameterization Synthesis of `define and parameter will depent on the context in which they are used! · Without generate the best way to do conditional instantiation of modules in Verilog is with `ifdef PARAMETER and `endif surrounding the module instantiation and `define PARAMETER in a configuration file that is included with `include in the Verilog source file making the instantiation Jan 8, 09 #12 shitansh Full Member level 5 Joined Jan 6, 09 Messages 296Conditional 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 only supports `ifdef which means if something is defined at all, the code between the `ifdef statement and the `else or `endif will be executed, and if not only the code after the `else (if any) will be executed I think to do what you want you should be using parameters instead of macros and then use generate statements to do what you want · Define in verilog is used to write MACRO's whereas parameter is used where you want to use constant or you want to make some parameter parametarizable!When using moduleinstance parameter value assignment (the rather wordy terminology for this method), the syntax is modulename # (parameterassignment) instancename (moduleterminallist) ;

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In this Verilog tutorial, we demonstrate the usage of Verilog parameters and ways to control themComplete code from the Verilog tutorial http//wwwedaplayThere are no operations permitted in `ifdef, but the code you wrote is fine You can get the effect of OR or AND operations by additional defines `ifdef TB_4 `define TB_4_OR_8 `ifdef TB_8 `define TB_4_AND_8 `endif `else `ifdef TB_8 `define TB_4_OR_8 `endif `endifWhere the parameter assignment can be by name or by the order of the values

Verilog Data Types

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4 Mountain View, USA Abstract SystemVerilog provides an effective means for designing assertionbased Verification IP and integrating it with a testbench This paper explores guidelines for designing such IP within the Synopsys Verification MethodologyVoid verilog_preprocessor_ifdef (char * Parameters in,out preproc The context who's file name is being set in file The file path to put as the current file Variable Documentation verilog_preprocessor_context* yy_preproc Stores all information needed for the preprocessor This does not usually need to be accessed by the programmer, and certainly should never be writtenSynplify and `ifdef/parameters 3 synthesis problem at quicklogic&synplify 4 synplify state machine 5 A petition for Synplify's new fature (FPGA synthesis tool) 6 Update A petition for Synplify's new fature (FPGA synthesis tool) 7 Synplify v70 Verilog support question 8 Synplify vs Leonardo 9 Verilog hierarchy support in Synplify 10

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