How to implement an asynchronous FIFO/data buffer in Simulink?

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Gilbert Zhao
Gilbert Zhao 2019-8-13
回答： Satheesh Appukuttan 2019-12-12
Hello,
I am working on a model which will packetize data at rate A and occasionally send data at rate B, in which rate B is 3.125x faster than rate A. However, it's unclear to me how I can design my model in Simulink such that it can support rates A & B independently.
In other words, I want to implement the equivalent of an HDL FIFO such that the output & input sample times are not a clean ratio of N or 1/N.
Any suggestions would be greatly appreciated, thank you.
-Gilbert

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采纳的回答

Gilbert Zhao
Gilbert Zhao 2019-8-21
Got around this issue by implementing an asynchronous FIFO outside of Simulink.

更多回答（2 个）

Samatha Aleti
Samatha Aleti 2019-8-19
Hi,
According to my understanding you would like to send data at 2 different rates independently. To do this you may use a “Rate transition block”. Assuming ”A” be the sample time of data generator (that you used), sample time of Rate Transition block should be 1/3.125 times that of “A” (in order to be 3.125 faster than “A”). Also make sure to uncheck the rate transition block parameter “Ensure deterministic data transfer”.
Satheesh Appukuttan
Satheesh Appukuttan 2019-12-12
Hi,
I have some basic questions related to FIFO. I need to implement a fifo in simulink and shift the data for each clock cycle. is there a example implementation ?
  1. Can I use from workspace to shift the values into fifo ?
  2. What clock models should be used to pop/push signals.
  3. What should be the sample time of the from work space ?

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