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60 Threads found on edaboard.com: Fsm In Vhdl
I'm still using Xilinx ISE (just found out it's discontinued). Here's a scenario I have in vhdl: Entity PinDriver with the following two outputs: OutPinA OutPinB Architecture looks like this: {process with some fsm that does things with OutPinA} OutPinB <= '0'; -- active low XST gives the following error: ERROR:Xst:528 - Multi-s
Hi All, Is there a way to code the fsm states in such way so that they will be represented in the waveforms in the literal format? I mean in the waveforms I want to see the named fsm states (not their coded binary representation). Thank you!
Hello K-J, this is the vhdl Code. The main problem is that the counter CountSTATUS is always '0'. Why? Thanks! library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_arith.all; use ieee.std_logic_unsigned.all; entity ANELL_LEDS_v1 is port (clk, rst: in std_logic; -- I/O definitions DataOut : out std_logic);
At least In real hardware, timing violations can easily cause "illegal" state transistions. Popular candidates for timing violations are: - asynchronously released reset - external inputs (buttons and sensors) that are used in the state machine without previous synchronization to the fsm clock.
Hallo, Can someone recommend me a simple and a nice tutorial to leanr vhdl testbenches? I would also like to get some good tutorials on fsm using vhdl. Thank you in advance.
your itr signal does not increment with clock, it increments when fsm is in s1 state. Try incrementing it in seq. logic.
Hi everyone! I am very new in vhdl and I need some help with the asignment I have to do. I want to send a character with hyper terminal to Spartan 3E board via RS232 and show its ASCII code on 8 LEDs. I have already implemented UART Receiver but now I don't know what else should I do. Do I have to make a new fsm to turn on the LEDs according
Hi, I am developing vhdl code for 0101 sequence detector. When i simulate, i get 0 output no matter what the sequence is. I have used JK flipflop to implement the design. In my code, im calling JK ff through component port-map. JK ff works fine individually but in the top-level module, its output is always zero. there's some warning when i check
Hi plz refer me some tutorial on writing an algorithm in C to an RTL coding using fsm
hello i wrote a code for Tic-Tac-Toe checker for my homework assignment and i just got my grade and it is not good. Im having some trouble understanding what is the problem with this code for this system and i was wondering if someone could explain to me what i did wrong here. my professor has an history of giving bed grads for codes he doesn't
Hello! I'm facing the problem of simulating an FFT core generator in vhdl. I have written a fsm and a test bench file to run the simulation of the Xilinx FFT core (Streaming) in ISE. I'm using a DDS module (from the core generator also) that generates a sinusoid at the input of the fft. What I'm getting at the output is something weird.
Well the design of simple testbenches is pretty much the same.You have the blackbox in your case the fsm(which has inputs and outputs).Using the state transition diagram(which you should have it drawn somewhere) you can start modeling the inputs to make your fsm pass through all possible states.Then ,when simulating, you should analyse each state
Okay so it compiles... when it runs it produces mostly U. (undefined) 85189 I would strongly suggest you use code /code tags or syntax=vhdl /syntax tags in the future. It should also preserve formatting. The 362 lines of code is pretty much unreadable without reformatting. I would also advise using signal names that mea
like this... if the code doesnt work, then better post the code here.. also start from soemthing simple and then go to complex fsm's.
I presume a misunderstanding of vhdl iteration loop operation. It's defining parallel operation, not a sequence in time. Any signal assigned in the loop will be updated after the end of the respective process. Your code snippet is omitting the important details, however. As a general suggestion, review your vhdl text books about the nature of
Hi, How can I dispaly the names of a fsm in modelsim I'm using vhdl as language regards
hello, I'm designing my first code in vhdl to create one UART. The principal CLK works at 60MHz, and I need divide the principal CLK for decrease the speed of the UART. It's normal create one process with one divided clk (signal COUNT(1))? or exist other designs more efficients? architecture fsm_sencilla of UART_TX is type estado is (
Hi friends; How can I display states of fsm in my vhdl testbench example: type type_test_state is ( IDLE, STATE_TEST, SEND_FINISH ); signal current_s, next_s : type_test_state; regards
Hi all, I have a simple question about the case statement in Verilog. Is there anyway to write something similar to this vhdl code: case state_reg is when (N-1) downto (0) => .... where N is parameter. What I need is to map the cases in Verilog let say from N-1 to 0 to one logic expression. Thanks in advance. VT
Your problem is the thing in the module is not working correctly. You fix this by fixing the thing in the module, such that it will work correctly. After that your problem will be solved. Hope this generic message with generic instructions will help you fix your generic problem described in a non-detailed generic fashion. :) Anyways, make mod
The easiest and most flexible way to do that is to design a fsm, in which each state defines which are the LEDs to turn on and which to turn off. In this way you can create any desired pattern just by changing the next-state logic. Be aware of the frequency of states change, since human eye would not see any change if this frequency is too high. C
The question refers to synthesis tool behaviour, you need to consult the manuals. I can tell about Altera Quartus. If a fsm is recognized by the design compiler, it overrides the encoding in the state variable definition and uses either the default one state hot encoding or a specific user setting. User settings can be applied e.g. by synthesis
My vhdl design contains one main control fsm and 4 sub modules connected to it.I want to use power gating technique to on/off that sub modules and control for this comes from main fsm.how to implement that power gating transistor.I will be using the synopsys deign compiler and IC compiler tool. i have the gate level netlist from the (...)
Just having a quick look at your code: 1. The asynchronous reset of your fsm process (if clr ='1') does not set 'next_state' (this is what I would expect from that reset). 2. The sensitivity list of the fsm process does not need the 'getfromreceiver' (besides the async reset, it is a clocked process). 3. The use of 'datain' in the fsm (...)
Are you using vhdl or verilog to code this?. Make sure, clock should in sensitivity list for fsm coded designs.
A configuartion oscillator, if accessible by the logic fabric is affected by similar PVT variation as a ring oscillator build from logic cell. You can expect about factor 1:2. I found a typical delay per logic cell of about 0.4 ns in Cyclone III delay chains. Synthesis attributes or low level primitives are required to make the
Below, is a code for an event detecor inplemented on an FPGA. The design has an input vector called: "events" and a steady state value for that vector - called "default_events_vector". If "events" and "default_events_vector" aren't equal, it means that an event has accured. This immidiatly changes the state of the asynchronous fsm and switches
Hey Folks, I'm having a rough time with my vhdl, I get so many errors all the time it's discouraging. I like doing it but man, it's slow going. :( Now my vhdl State machine isn't working. I have to use case statements for this part of my LAB. I'm trying to have a series of output ports go HIGH for a certain counter state. So I have my Addr
Hi asraf, I have some experience coding state machines in vhdl. You appear to have multiple concurrent processes setting the count and index registers. This may create conflict as to what actually happens to the registers. It would be helpful if I knew what you are trying to achieve. I found this software useful in the past: [url=sourceforg
I'm not sure, if the term Medvedev fsm is commonly used, but this design differs from Mealy/Moore by having registered outputs. Respectively the outputs are registered state bits. In my opinion, it's the natural way to design a state machine.
If you're looking for a tool that converts fsms to Verilog/vhdl, you can try the StateCAD tool. It used to be bundled along with Xilinx ISE 8/9 versions, but has been dropped from the latest versions. You could try googling for StateCAD and see if you get to download the older versions. It's a pretty good tool for fsms can give output in (...)
And usually with a 2 process state machine, the reset is done in the clocked process, not the asynchronous process. Yes, for the usual asynchronous reset. The present code is implementing a synchronous reset, not so bad at all. The problem is in the fsm state design however. It's going through three states for an input signal of
Think about what a pipeline is. First thing to do is draw out your pipeline. What happens in the first stage? Then the second, etc. Pipelines are relatively easy to code in vhdl, although an fsm is simply the easiest! Draw out your pipeline and we might be able to assist you better. Good luck
I would approach this with an fsm. Idle State -> Wait for input n to be valid and register it, move to the compute state Compute State -> Have a counter that counts from 0 to n-2 (or 2 to n...whatever), incrementing the counter each clock cycle. After each iteration, compare with n. If equal to n then move back to the idle state As Trick****y
Hi, i`m trying to crate an fsm on a Spartan 3E-1600, an so far I didn`t do nothing. I`ve found some codes on internet but most of all are wrong. In my last reserches i`ve found an examples describing an fsm but dont know what its doing, i`m using Xilinx ISE 11 and the HDL is Verilog. I`m still a beginer with FPGA`s and i have a project in few month
look into the following are a couple of papers at Added after 1 minutes: also came across this
Hello alelex; The best thing is to use finite state machine to synthesize your sequential circuit. you can use either Moore's or Mealy's topolgy. Please read the following page to review your knowledge about fsm I can give you a simple example of what you can do I'm not
I already have a hierarchical fsm in my design and I want to know the best RTL (vhdl/Verilog) coding style.
Hi folks What is the best way to code nested fsm states in vhdl ? .. i.e. when we have a parent state (say X) that has more than one child states (say Y,Z, etc) that are all encapsulated inside it.
Hi All Sometime Back i read a comprehensive paper that described about 10 Best ways to code an fsm in Verilog and vhdl for time /Area Or both. It is like 3 Process/ 4 Process/Huffman style coding .. I forgot the name of the paper or the chapter or book. Anyone has similar document pls upload it . Thanks in advance Vipul
For code readability, I prefer to place the counter operation in the fsm code. Don't see, what should be "weird" in this respect. Generally, any meaningful synchronous counter construct can be expected to be minimized by the vhdl compiler to a similar hardware structure. Thus, it's mostly a matter of taste where to place the counter.
Hi! I want to programme a fsm (finite state machine) and the only problem left is, that I have to distinguish a certain bit pattern. How can I do this in vhdl? I only want to distinguish the first bit and in the next step the following 5 bits (in 2 steps) For example: My register holds 011010 first step: distinguish MSB (0 or 1) second step:
hi friends i am doing thesis work on VLSI design of fsm VENDING machine with vhdl /XILINK. i want to study ATM machine code in vhdl ...can anyboby help me? reply plz
you can find the code in the and material can be found in digital communication book by bernard sklar therez another book which i dont remmember exactly but itz title is something like digital design with vhdl where he describes it as an example of fsm haneet
I m not getting the concept of fsm. Can anybody help? Also I want information on digital syatems design using vhdl. fsm:Finite state machine is a behavior model of programming in digital design where data is transformed from one state to another. Briefly... vhdl is an intergrated circuit language through which you can
is it possible to build an fsm for any arbitary system? are there any restrictions? exceptions? which is a good book on this topic? the thing is, i know how to construct it theoritically on paper, but have trouble coding it in vhdl. my friend recommended me "digital system design using vhdl" by charles roth. could you please post a link (...)
Dear all, I'm learning vhdl, after some simple example I'm going to closely look at the implementation of this one shot delay generator, here the code: library ieee; use ieee.std_logic_1164.all; use ieee.numeric_std.all; -- entity definition entity pulse_5clk is port( clk, reset: in std_logic; go, stop: in std_logic;
Hi Shiva. I will definitely help you . But could you please state the fsm problem in text . Not with a diagram Thanks and Regards Deepak
Hi all, I really need someone help. I am in my final project and a part of it deals with implementation of a driver for Ethernet chip AX88796 -from Asix that is found on xstend board v.3 from XESS- by vhdl using fsm and ASM. When i have finished ,I tested it by simulation and it successfully works but when i tried to download the design on my 3c
Hi everyone............... what does control path and datapath concepts refers to in fsm... what does they signify......... what are conditions to be checked in while writing fsm