Most new FPGA designs incorporate one or more hard and soft core processors. Arm’s AXI4 interconnect is one way to add peripheral support. The PYNQ-Z1 board is designed to be used with PYNQ, a new open-source framework that enables embedded programmers to exploit the capabilities of Xilinx. This article explains pipelining and its implications with respect to FPGAs, i.e., latency, throughput, change in operating frequency, and.
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And they are very handy! FIFOs can be used for any of these purposes:. A FIFO can be thought of a one-way tunnel that cars can drive through. At the end of the tunnel is a toll with a gate.
Once the gate opens, the car can leave the tunnel. If that gate never opens and more cars keep entering the tunnel, eventually the tunnel will fill up with cars. How deep the FIFO is can be thought of as the length of the tunnel.
The deeper the FIFO, the more data can fit into it before it overflows.
Below is an image of the basic interface of any FIFO. These signals will always be found when you look at any FIFO. Often there are more signals that add additional features, such as a count of the number of words in the FIFO.
See the figure below:. The FIFO can be rpga up into the write half and the read half. The designer should never write to a full FIFO!
Always check the FIFO Full flag to make sure there’s room to write another piece of data, otherwise you will lose that data. I find it easier when designing code to gpga the write-code in one file and the read-code in another file, just to be careful. The designer should never read from an empty FIFO!
As long as you obey these two basic rules you and FIFOs will get along nicely. I’ll restate them again because they’re just that important.
Which one of these two the synthesis tools will use is entirely dependent on the FPGA vendor that you are using and how you structure your code. Just know that when you use the dedicated pieces of logic they have better performance than having a nedur FIFO.
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