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VERILOG QUESTIONS

SystemVerilog feature "reg" encountered in Verilog context?
SystemVerilog feature "reg" encountered in Verilog context?
To fix this issue Verilog does not allow specification of data types of parameters, but SystemVerilog does. Make sure your file has a *.sv file extension. Otherwise, parameters assume the type from the RHS.
TAG : verilog
Date : January 02 2021, 06:48 AM , By : RandomInteger
I'm trying to make test bench code in edaplayground
I'm trying to make test bench code in edaplayground
may help you . It has some error in my code, but I can't find anything wrong with my code. EDA Playground says , Your testbench includes these lines:
TAG : verilog
Date : January 02 2021, 06:48 AM , By : infin8loop
Latches are transparent to half of the clock cycle. Means?
Latches are transparent to half of the clock cycle. Means?
it fixes the issue "Transparent" means that signal changes at the input are directly passed to the output. (Although with the inevitable delay for the signal to get through the logic).
TAG : verilog
Date : January 02 2021, 06:48 AM , By : Ralton Plain
what will be the output of the following verilog code..?
what will be the output of the following verilog code..?
I hope this helps . This is a race condition. Verilog does not guarantee the ordering of execution between processes synchronized to the same event. One simulation tool might pick the first block. another tool might pick the second block. Synthesis t
TAG : verilog
Date : January 02 2021, 06:48 AM , By : Domi
Access internal regs without declaring them as input/outputs
Access internal regs without declaring them as input/outputs
this one helps. You can do that by hierarchical reference.However as far as I know you can only use that in test-benches.(I have never even dared to use that in RTL).
TAG : verilog
Date : January 02 2021, 06:48 AM , By : Jacob Kok
Integer input of a Task in Verilog
Integer input of a Task in Verilog
wish helps you Yes, you need the input keyword using this very old Verilog syntax to declare the task arguments. Verilog-2001 (18 years ago, and there have been 4 revisions since then) added ANSI-C style argument definitions, and the default directio
TAG : verilog
Date : January 02 2021, 06:48 AM , By : Leonardo Longhi
How does a sensitivity list work in circuit level?
How does a sensitivity list work in circuit level?
help you fix your problem Verilog excerpt will infer DFF (D Flip-Flop) with async reset. This happens due to the fact that reset signal is a part of sensitivity list.NOTE1: as per LRM for Verilog, adding the reset to the sensitivity list is what make
TAG : verilog
Date : January 02 2021, 06:48 AM , By : zeus
Using inputs as parameters in Verilog
Using inputs as parameters in Verilog
will be helpful for those in need If you want to take a slice out of the vector you have to work around the unequal size on the RHS and LHS. This is such a solution:
TAG : verilog
Date : January 02 2021, 06:48 AM , By : Injamul_Abeg
Where can I get Verilog codings?
Where can I get Verilog codings?
seems to work fine http://www.aoki.ecei.tohoku.ac.jp/arith/mg/algorithm.html -- here is the generator for arithmetic modules in Verilog.
TAG : verilog
Date : January 02 2021, 06:48 AM , By : Tamazapan
Is there any way to get default parameter value for verilog module with Yosys
Is there any way to get default parameter value for verilog module with Yosys
I hope this helps you . Yosys recently gained the functionality to preserve parameters through elaboration (whereas they are usually thrown away). Add -pwires to read_verilog and parameters will be converted into wires driven by the parameter's defau
TAG : verilog
Date : January 02 2021, 06:31 AM , By : user3094366
what are the uses of case 'inside's in verilog ? is it synthesizable?
what are the uses of case 'inside's in verilog ? is it synthesizable?
wish helps you In Verilog you don't have case inside - that is SystemVerilog. In Verilog, if you want wildcards in your case statement, you have to use either casez or casex. In a casez statement, a Z means don't care; in a casex statement, a Z or an
TAG : verilog
Date : December 27 2020, 04:37 PM , By : user3085485
Output is in undefined state
Output is in undefined state
it fixes the issue Image. I am trying to solve a problem that was written below. I confused why my output was in undefined state. A "population count" circuit counts the number of '1's in an input vector. Build a population count circuit for a 255-bi
TAG : verilog
Date : December 26 2020, 02:01 AM , By : user3081412
How can i writing test bench for multiple module?
How can i writing test bench for multiple module?
This might help you I have some bad new for you: You can't really write a test-bench for your 'circuit1_main' as it is rather broken. Your module has a number of internal signals: clk_m,reset_m,ud_m,load_m; which should all come from outside. They sh
TAG : verilog
Date : December 25 2020, 09:30 PM , By : user3079286
How do I drive a signal from 2 sources in system verilog
How do I drive a signal from 2 sources in system verilog
fixed the issue. Will look into that further I'm trying to write a RTL model in which I monitor independent clock sources. These clock sources can have variable frequency (range 5 to 50MHz)
TAG : verilog
Date : December 25 2020, 06:30 PM , By : user3077743
How to use a PLL to make a 50% duty cycle clock from a non 50% duty cycle clock
How to use a PLL to make a 50% duty cycle clock from a non 50% duty cycle clock
With these it helps Use the Clocking Wizard in Xilinx ISE. It will generate HDL code to instantiate a PLL on your hardware. It'll prompt you for the input and output frequency; from what you've described in your question, it sounds as though you have
TAG : verilog
Date : December 25 2020, 05:02 PM , By : aarvi
Creating a `RAM` chip in `Verilog` with single in/out data port
Creating a `RAM` chip in `Verilog` with single in/out data port
may help you . all RAM examples I can find have a separate data write and data read port.
TAG : verilog
Date : December 25 2020, 04:30 PM , By : user3076854
Why traps Rocket Chip on FPGA after code execution in DRAM
Why traps Rocket Chip on FPGA after code execution in DRAM
With these it helps Recently ran into a similar issue with DDR4, GDB and a SiFive RISC chip. After loading code onto the DDR4, and attempting to step from the reset vector, the RISCV would immediately jump to 0x00000000. After debuging with a Xilinx
TAG : verilog
Date : December 24 2020, 12:47 PM , By : user3067317
RGB to YUV conversion equation
RGB to YUV conversion equation
Hope this helps You are missing a part, (65.7388*R)/256 becomes (R
TAG : verilog
Date : December 23 2020, 06:30 PM , By : Debora
if you have a long signed array, can you break it up using wires?
if you have a long signed array, can you break it up using wires?
will help you That's one way. You can also cast each slice using $signed(in[5*(i+1)-1 -: 5]), then you don't need an intermediate signal. SystemVerilog adds another option. You can defined a packed array which is a 50-bit vector made up of 10 signed
TAG : verilog
Date : December 10 2020, 05:24 AM , By : user3051119
Verilog Syntax unable to understand
Verilog Syntax unable to understand
To fix the issue you can do Can someone please help me to understand what (.LENGTH(`REG_FILE_ADDR_LEN)) in the following code means? Also, will this code be synthesizable? , When defining a module, you can define parameters, for example:
TAG : verilog
Date : December 05 2020, 12:25 PM , By : user31102
Realtime CPU clock vs High Frequency Software clock
Realtime CPU clock vs High Frequency Software clock
To fix the issue you can do The simulation does not "run" in realtime. So it will compute the result for the steps and if it is done it is done. Which means that the ratio between number of required steps (as well as problem complexity) and your comp
TAG : verilog
Date : December 05 2020, 12:04 PM , By : user3047014
How do you or a vector with a single bit in verilog?
How do you or a vector with a single bit in verilog?
around this issue Are you sure you want to do or? Then you will only have 2 possible outputs: the original vector (if the bit is 0), and a vector of all 1's (if the bit is 1). If so you can just use this conditional assignment:
TAG : verilog
Date : December 01 2020, 04:47 PM , By : fatswallow
How can you output a constant value in Verilog?
How can you output a constant value in Verilog?
seems to work fine You can create a function that provides a constant value to a localparam or any other signal.
TAG : verilog
Date : November 26 2020, 06:23 AM , By : user3040689
malformed statement in verilog
malformed statement in verilog
fixed the issue. Will look into that further You're trying to instantiate your module in an initial block, which is illegal. Removing the initial begin inside module Init should solve the problem. Have a look at this page for an example: http://asic-
TAG : verilog
Date : November 22 2020, 11:02 AM , By : Jerotronics
Rising edge detection sysverilog
Rising edge detection sysverilog
Hope this helps This is a basic synchronous edge detection circuit.The input, sig_a, is sampled on each rising edge of the clock, clk. The sampled value is registered; that is, sig_a_d1 is the value of sig_a delayed by one clock cycle.
TAG : verilog
Date : November 22 2020, 10:58 AM , By : Александр Абрамович
Counting of different channels diverge and jumps
Counting of different channels diverge and jumps
will help you I would suspect a meta-stability problem. Your incoming pulses on ch1/ch2 are probably not synchronized with the system clock you are using. See here.Because of this you are probably sometimes catching the counter updates 'mid-stride' s
TAG : verilog
Date : October 31 2020, 04:00 PM , By : Shaheryar
Number of bits for a particular count of integer in Verilog
Number of bits for a particular count of integer in Verilog
may help you . Verilog and System Verilog have a built-in system function $clog2(), i.e., ceiling-of-log2.It can be shown that the number of digits in base b of a positive integer k is .
TAG : verilog
Date : October 08 2020, 11:00 PM , By : Herwig Birke
Verilog: How to assign the output of a module to a bus which have different width
Verilog: How to assign the output of a module to a bus which have different width
should help you out Use concats, something like the following. Use a temporary signal as a filling for the unconnected slice.
TAG : verilog
Date : October 08 2020, 09:00 PM , By : jrlebeau
Declare a port in Verilog where some bits are inputs and some are outputs
Declare a port in Verilog where some bits are inputs and some are outputs
I hope this helps you . You can use a port_expression. This separates the name of the port from the signals (or expression of signals) connected to the port. You might recognize this syntax when creating a module instance, but it has always been avai
TAG : verilog
Date : October 06 2020, 02:00 PM , By : 康礼平
In Verilog, can a "for loop" be of variable size?
In Verilog, can a "for loop" be of variable size?
I think the issue was by ths following , I assume you actually ask: can this be synthesized. The answer is NO. A for loop is unrolled in compile time. (See also here ) As such the start, increment and end value must be known when you compile. This al
TAG : verilog
Date : October 05 2020, 06:00 PM , By : Siddharth Nilesh Sha
100-bit binary ripple carry adde
100-bit binary ripple carry adde
Any of those help well, you cannot instantiate a module inside of an always block. Try a generate block instead:
TAG : verilog
Date : October 05 2020, 10:00 AM , By : Daniela Pariona Coro
25 MHz clock used for HDMI
25 MHz clock used for HDMI
hop of those help? I'm not sure where 24.5MHz comes from either... 60fps is the framerate of the video standard considered here. Anything else might not be accepted by the sink device.
TAG : verilog
Date : October 05 2020, 05:00 AM , By : Suzana Stevic Petkov
Syntax checking with iverilog
Syntax checking with iverilog
will help you You should only use `include to include files that are required for compilation of the code that follows. Verilog does not require modules that are cross-referenced to be compiled first.Instead, give the compiler a list of files to comp
TAG : verilog
Date : October 05 2020, 04:00 AM , By : SRK
the difference between a[b+1] and a[b+1'b1]
the difference between a[b+1] and a[b+1'b1]
Any of those help when I try to write to a[b+1] where the bits of b are all '1' ,the value of the reg a[0] do not update,but when I try a[b+1'b1],it updated , Here is a reproducible example:
TAG : verilog
Date : October 04 2020, 05:00 AM , By : Neelu Patil
Clock domain crossing signals and Jitter requirement
Clock domain crossing signals and Jitter requirement
Any of those help I can confirm the intent of the original statement is 3 positive edges, let me explain why. It is quite straightforward to identify the potential for a pulse that is two positive edges wide to be filtered - specifically if the actua
TAG : verilog
Date : October 03 2020, 02:00 AM , By : Станислав Калита
System Verilog parameterise class with interface
System Verilog parameterise class with interface
I hope this helps . You can parameterise a class with an interface in SystemVerilog. You just weren't doing it quite right. This works:
TAG : verilog
Date : October 02 2020, 12:00 PM , By : John McLaughlin
How does Verilog interpret multiplication by a single bit?
How does Verilog interpret multiplication by a single bit?
With these it helps Any good synthesis tool will optimize multiplication where it can, especially when it involves multiplication by zero or any power of 2. But you've created a very hard to read operation. Why not write it the way you said it:
TAG : verilog
Date : October 01 2020, 09:00 PM , By : Easy Dx
== operator in assign statement (Verilog)
== operator in assign statement (Verilog)
around this issue The difference is structural/declarative context versus procedural context. When you use an if clause in a declarative context (in this case it is at the same top level where you declare your wires and variables), it is considered a
TAG : verilog
Date : September 30 2020, 09:00 AM , By : Zheng Su
d[7:0] is an input vector, which shows to be ZZ in the simulation waveform. When does such a situation arise in a Xilinx
d[7:0] is an input vector, which shows to be ZZ in the simulation waveform. When does such a situation arise in a Xilinx
Any of those help You have never assigned any value to the signal. Check your connections. Also check all your signal names. (Capitalization typos etc.)
TAG : verilog
Date : September 27 2020, 07:00 PM , By : Hipster
Mips DataMemory with Verilog
Mips DataMemory with Verilog
I wish did fix the issue. The testbench keeps the design in reset. You need to set rst=0 after some delay.
TAG : verilog
Date : September 27 2020, 05:00 PM , By : rarias84
Verilog and condition for Always block
Verilog and condition for Always block
will be helpful for those in need Your first big problem is @(expression) means "wait until the expression has a value change". That change could be from 1➩0 or 0➩1. Typically one only uses always @(posedge clk) for synchronous logic, or always @(*)
TAG : verilog
Date : September 27 2020, 11:00 AM , By : CAD
Unexpected result of Not operator in assignment
Unexpected result of Not operator in assignment
around this issue I have two 8-bit inputs A and B, , Why is the output 9'h1F0 and not 9'h0F0?
TAG : verilog
Date : September 26 2020, 06:00 PM , By : Soumyajit Mitra
Is there a way to write assertion or checker other than Verilog modeling for Zero-delay/width glitch?
Is there a way to write assertion or checker other than Verilog modeling for Zero-delay/width glitch?
will help you I am verifying the clock itself and want to know if there is way to flag zero width glitch? , This should work.
TAG : verilog
Date : September 26 2020, 05:00 AM , By : Edwin Pajemola
How do I use combinational logic while using posedge?
How do I use combinational logic while using posedge?
Does that help Non-blocking assignment works does not assign values immediately to the 'count'. Instead they postpone the assignment till the end of the simulation tick. So, in your case:
TAG : verilog
Date : September 25 2020, 09:00 PM , By : Jeremy Kuang
How to eliminate race condition on a variable in systemverilog?
How to eliminate race condition on a variable in systemverilog?
it should still fix some issue Since you say you're using the UVM, I assume this is inside your testbench code. And since you are using a task, you can call uvm_wait_for_nba_region() before reading the variable and you'll get the new value regardless
TAG : verilog
Date : September 24 2020, 02:00 PM , By : Chile
`define in generate if statement
`define in generate if statement
around this issue Because `define is a compile directive. It is evaluated before your code is compiled. `ROMS is always defined, whatever the value of syn.
TAG : verilog
Date : September 23 2020, 04:00 PM , By : Benjamin L.
If else and case in system verilog
If else and case in system verilog
I hope this helps . You are generating latches which are not a combinatorial circuit. To avoid that you have to make sure that every variable is assigned a value in every possible path. There are two ways to do that:
TAG : verilog
Date : September 23 2020, 01:00 AM , By : Waewmani Phawong
How do I instantiate a module which has a reg port in Verilog?
How do I instantiate a module which has a reg port in Verilog?
I wish this help you Typically, a module containing testbench code can have either of two styles: the module under test (DUT) is instantiated in the testbench module (TB) itself, or the DUT and TB are separately instantiated in a top-level module tha
TAG : verilog
Date : September 19 2020, 11:00 PM , By : Assaf
How to create an array of interface of different size in system verilog
How to create an array of interface of different size in system verilog
wish helps you I have a configurable module which contains an interface for one of the ports. I use a generate statement and a for loop to create different configuration of each module instance and I bring the interface ports out in an array. My issu
TAG : verilog
Date : September 18 2020, 04:00 AM , By : EJ Pesigan
Vivado Error named: [Synth 8-6859] multi-driven net on pin
Vivado Error named: [Synth 8-6859] multi-driven net on pin
it should still fix some issue You say You want to inialise the values. The whole design is combinational.
TAG : verilog
Date : September 13 2020, 12:00 PM , By : Rolex
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