To access on-board memory locations from MATLAB® or Simulink®, you must include the MATLAB AXI master IP in your FPGA design. This IP connects to slave memory locations on the board. The IP also responds to read and write commands from MATLAB or Simulink, over JTAG, PCI Express, or Ethernet cable.
To set up the AXI master IP for access from MATLAB or Simulink, follow these setup steps:
Add the path for the MATLAB AXI master IP files to your project using the
Open Vivado®, and from the IP Catalog select the MATLAB AXI master IP in your FPGA design.
When using JTAG as a physical connection, select MATLAB as AXI Master.
When using Ethernet as a physical connection, select UDP MATLAB as AXI Master and Ethernet MAC Hub and add them to your project.
When using PCIe as a physical connection, select PCIe MATLAB as AXI Master and add it to your project.
In your FPGA project, specify which addresses the AXI master IP is allowed to access.
Compile your FPGA project, including the MATLAB AXI master IP.
Connect your FPGA board to your host computer using a physical cable (JTAG, PCI Express, or Ethernet cable).
Program the FPGA with your compiled design.
Alternatively, you can perform these steps in the HDL Coder™ guided workflow by using a sample reference design, such as the one included in this example: Access DUT Registers on Xilinx Pure FPGA Board Using IP Core Generation Workflow.
After loading the design on your FPGA, you can access memory-mapped locations on the board.
To access the board from Simulink, create a Simulink model and include AXI Master Write and AXI Master Read in it. Configure the blocks to read and write memory-mapped locations on the board. For more information, see Use Simulink to Access FPGA Locations.
When using JTAG as a physical connection to your board, you might have additional
IPs that use the same JTAG connection. Such IPs include FPGA data capture,
Intel® SignalTap II, or Xilinx®
Vivado Logic Analyzer cores. However, only one of these applications can use
the JTAG cable at a time. You must release the
aximaster object to return the JTAG resource for use by other
The most common conflicting use of the JTAG cable is to reprogram the FPGA. You must stop any FPGA data capture or MATLAB AXI master JTAG connection before you can use the cable to program the FPGA.
The maximum data rate between host computer and FPGA is limited by the JTAG clock frequency. For Intel boards, the JTAG clock frequency is 12 MHz or 24 MHz. For Xilinx boards, the JTAG clock frequency is 33 MHz or 66 MHz. The JTAG frequency depends on the type of cable and the maximum clock frequency supported by the FPGA board.