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It might work today and not tomorrow. It might work perfectly for months, and then have a fatal flaw. In many ways, metastability problems are the worst of all errors. It makes more sense for us to use a binary number, which can represent the full resolution of the duty cycle in our VHDL implementation.

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I've solved this problem by placing a "deoscillator" to the circuit, which stops it from looping between 1 and 0. My solution can be found from here: https://gitlab.com/eronenveeti174/deoscillated-flip-flop-in-vhdl/ I'm trying to VHDL code this circuit below to avoid metastability in my project. library ieee; use ieee.std_logic_1164.all; entity Metastability is port ( clk : in std_logic; key : in std_logic; reset : in std_logic; Led : out std_logic ); end Metastability ; architecture rtl of Metastability is signal metastable : std_logic; signal stabel : std_logic; begin process (clk,reset) begin if (reset ='1') then metastable <= '0'; stabel <= metastable; Led <= stabel; else if rising_edge (clk) A metastable state is one in which the output of a Flip-Flop inside of your FPGA is unknown, or non-deterministic. When a metastable condition occurs, there is no way to tell if the output of your Flip-Flop is going to be a 1 or a 0. A metastable condition occurs when setup or hold times are violated. Metastability is bad. Metastability is a phenomenon that can cause system failure in digital devices, including FPGAs, when a signal is transferred between circuitry in unrelated or asynchronous clock domains.

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Synchronization in Digital Logic Circuits from Ryan Donohue (PDF presentation). Metastability implies that the FF circuit is in a linear operation mode (rather than a saturated operation) where it is kind of stable (=metastable) in between the extreme states. Sufficient noise can then make it go either up or down.

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This lecture discusses concept of metastability. Synchronous designs suffer from this inherent problem associated with flip-flops, latches in the design.

Metastability is bad.
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Links. What is Metastability? and Interfacing Two Clock Domains from World of ASIC. Metastability in electronics from Wikipedia. Synchronization in Digital Logic Circuits from Ryan Donohue (PDF presentation).

I've solved this problem by placing a "deoscillator" to the circuit, which stops it from looping between 1 and 0. My solution can be found from here: https://gitlab.com/eronenveeti174/deoscillated-flip-flop-in-vhdl/ I'm trying to VHDL code this circuit below to avoid metastability in my project. library ieee; use ieee.std_logic_1164.all; entity Metastability is port ( clk : in std_logic; key : in std_logic; reset : in std_logic; Led : out std_logic ); end Metastability ; architecture rtl of Metastability is signal metastable : std_logic; signal stabel : std_logic; begin process (clk,reset) begin if (reset ='1') then metastable <= '0'; stabel <= metastable; Led <= stabel; else if rising_edge (clk) A metastable state is one in which the output of a Flip-Flop inside of your FPGA is unknown, or non-deterministic. When a metastable condition occurs, there is no way to tell if the output of your Flip-Flop is going to be a 1 or a 0. A metastable condition occurs when setup or hold times are violated.
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The VHDL simulation environment was selected for its high simulation speed, In the context of the ture of a digital multi-bit phase-frequency detector (PFD), and digital distributed clock generator, the following parameters of describes in details the VHDL modeling of metastability issues individual ADPLL have an impact on the overal network per- related with asynchronous operation of … The paper presents an original model and architecture of a digital multi-bit phase-frequency detector (PFD), and describes in details the VHDL modeling of metastability issues related with Dear Gurus, I am relatively new to VHDL and hardware so here goes… I have designed a board that receives asynchronous data from a PC via USB @ ~ 12mb/s via an FTDI device (FT2232H). The device (in the mode I'm using) clocks its data out to the FPGA using a 60MHz clock (so the WR# strobe is ~16 Jim Duckworth, WPI 30 VHDL for Modeling - Module 10 Metastability • Flip-flops may go metastable if input signals do not meet setup and hold specifications relative to clock signal • Rules: – Input only drives one FF – Add 2-FF synchronizer IF clk’EVENT AND clk = ‘1’ THEN More subtle design errors are best detected by a thorough system-level simulation. DO NOT COPY 7.12 VHDL Sequential-Circuit Design Features Most of the VHDL features that are needed to support sequential-circuit design, in particular, processes, were already introduced in Section 4.7 and were used in the VHDL sections in Chapter 5. 2016-03-28 VHDL FIFO Purpose FIFO stands for first in, first out and is a great way to implement a buffer in VHDL. There are two types of FIFO's: 1. Synchronous - common clock on input and output 2. Asynchronous - different clocks on the input and output A great use of a synchronous FIFO is as buffer storage.

Links. What is Metastability?
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Instability, Metastability or Failure: Assessing the Reliability of 28nm FPGA Technology Edward Wyrwas, DfR Solutions, LLC. 1 Introduction. Space-bound systems use 65nm Radiation Hardened FPGA technologies that are nearing end-of-life (Xilinx Virtex 5QV). AN 42: Metastability in Altera Devices Metastability does not necessarily cause unpredictable system performance. If the wait time is sufficient to allow the flipflop to settle to a stable state, metastability does not affect the system; the output of the flipflop can temporarily have an undefined value, provided that it returns If the input signal changes within the "metastability window" the output could take a long (theoretically infinite) time to settle to a stable value. That time could well be longer than one clock cycle, so we add another flip-flop just in case. It's vanishingly unlikely for the second flip-flop to get hit by metastability.