Sharing buffer address with programmable logic

[pynquser]

Hello, I basically filled a buffer with some data using numpy and now I want the data in this buffer to act as input for my programmable logic. As I understand I will need to give the address of this buffer to the programmable logic but how will I do this and where?

[marioruiz]

Hi @pynquser,

Welcome to the PYNQ community.

I suggest you check out these tutorials:

Tutorial: PYNQ DMA (Part 1: Hardware design)

PYNQ DMA tutorial (Part 1: Hardware design) This tutorial will show you how to use the Xilinx AXI DMA with PYNQ. It will cover adding the AXI DMA to a new Vivado hardware design and show how the DMA can be controlled from PYNQ. This tutorial is based on the v2.6 PYNQ image and will use Vivado 2020.1. If you are using a different PYNQ version you should be able to follow the same steps in this tutorial, but you should make sure you are using the supported version of Vivado for that PYNQ release. …

Tutorial: AXI Master interfaces with HLS IP

PYNQ HLS AXI Master tutorial Introduction Previous tutorials show how to build IP with AXI stream interfaces and how they can be connected in a Vivado project to an AXI DMA. The DMA can be controlled from PYNQ to send data to the IP and receive results. AXI stream interfaces are useful if you are connecting multiple IP together in a dataflow type architecture. However, you don’t have to use AXI streams and DMAs with HLS IP. HLS supports AXI master interfaces which can read and write data as r…

You should also provide more details of the interfaces to your logic. This way the answer can be more specific.

Mario

[pynquser]

Hi @marioruiz

Thanks for your reply. I did go over the DMA tutorial, but I am not quite sure how I can implement it with my IP (please see the picture below). I require high speeds so I assume that DMA is the fastest option. I have provided a picture for the interfaces of my logic. The input is a data bus of 72 bits, and on the output side, the data will be leaving serially. How can I go about implementing this?

[marioruiz]

You should adapt your interfaces to use AXI4-Stream. This is likely the easiest solution.

[pynquser]

Hi, I adapted my input (this is the data I need to be sent from python) to be AXI stream interface/
Also, how can I ensure that the data that I will be sending from python is binary? Do I have my input array of size 72 and have inside of it values of 0 and 1? Will it automatically be taken as binary?

[marioruiz]

Data is already in binary, like in any other digital system. You can interpret these bit it in many different ways.

Mario