slave flip‐flopflip‐flop propagation timeslate transient detector (LTDhigh threshold inverterdelay‐locked loopLatency and ThroughputFIFO SynchronizerAvoiding SynchronizationPredictive SynchronizersOther Low-latency SynchronizersAsynchronous Communication Mechanisms (ACM)Some Common Synchronizer Design Issues...
Neither of these approaches can guarantee that metastability cannot pass through the synchronizer; they simply reduce the probability to practical levels. In quantitative terms, if the Mean Time Between Failure (MTBF) of a particular flip-flop in the context of a given clock rate and input trans...
The most common way to tolerate metastability is to add one or more successive synchronizing flip-flops to the synchronizer. This approach allows for an entire clock period (except for the setup time of the second flip-flop) for metastable events in the first synchronizing flip-flop to resolve ...
Now when I compile my project and run Time Quest, it recognizes the two flip flops within the "EdgeDetectNoEn" block as a Synchronizer chain within the "Report Metastability" report. I was able to force the two flip flops so Time Quest gave me the MTBF, but I am getting a timing viol...
If they are close, the data signal might not propagate to the second flip-flop. The synchronizer shown in Figure 5.3 consists of two flip-flops. The first flip-flop prevents an increase in tpd and a hazard from being transferred to the output of the second flip-flop. Even in this ...
You might ask yourself “Why would anyone want to have a public synchronizer available to download?” Usually designers just grab a flip-flop from his or her company’s or a standard cell vendor’s library. However, are these handy solutions the best course of action today? Current SoC desi...
To give a little background on my project, I wanted to use only a single flip-flop synchronizer to synchronize an asynchronous input signal. Although a double-stage synchronizer would be preferable, power consumption as well as latency are both critical in my system. Doubl...
flip-flop in a circuit. Thus, in one example, the flip-flop may be located as a first flip-flop in a synchronizer connected at the crossing of clock domains; in this case, the metastability function corresponding to that flip-flop in the gate level design flow will detect metastability ...
A synchronizer eliminates metastability due to violation of either the setup time or the hold time of a circuit. The input of a first flip-flop (12a) is tied to a constant logic level (VDD or ground). The first flip-flop receives an asynchronous signal into the reset (preset or clear)...
First, if you are implementing a synchronizer in a PLD, put the synchronizer flip-flop and destination flip-flops in the same part to minimize the delay from the synchronizer's output to its destination. Second, you can reduce the effects of metastability by using a multiple-stage synchronizer...