Using AXI Monitor

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Assumptions

These instructions are geared towards using the Chipscope with a Zynq 7000 chip in mind, but in general it can be applied to nearly any Xilinx FPGA. It's also assuming that development is done on one of the Linux servers, connecting to the Zedboard using the hw_server tool (as in the CprE488 labs). Programming the bitfile, the *.elf software binary, and Chipscope monitoring are all done over the running hw_server.

Necessary IP Blocks

There are two IP blocks which need to be added to the project. Here we're using XPS, but these could be added in a regular ISE project too.

  • Chipscope Integrated Controller: interfaces between JTAG and one or more Chipscope monitors.
  • Chipscope AXI Monitor: listens to a single AXI bus.

Consider the XPS screenshot below. We search for "chip" in the IP catalog and add the two cores mentioned earlier. These are added as chipscope_icon_0 and chipscope_axi_monitor_0. The chipscope_icon_0 has a port monitor0 which is connected to chipscope_icon_0::CHIPSCOPE_ICON_CONTROL. The chipscope_axi_monitor_0 has a port MON_AXI which is connected to the only AXI bus in the design, called axi_interconnect_1.


Screenshot1.png

Build the bitfile and export to SDK as usual.

Using Chipscope

In Windows (ie the system attached to the Zedboard), load Chipscope:

  • Click JTAG Chain -> Open Plugin ...
  • Select the item that contains "Xilinx_platformusb", click OK.
  • The software will connect over JTAG. Click OK on the next dialog.
  • A window comes up which will contain the waveform data, but all the signals are called "DataPort[x]". We need to tell Chipscope the signal names.
    • Click File -> Import...
    • Click Select New File and browse to the .cdc file. This will be in something like project/implementation/chipscope_axi_monitor_0_wrapper/chipscope_axi_monitor_0.cdc. Leave the rest default and click OK.
  • Set up the trigger in the "Trigger Setup" window. For example:
    • Set up a trigger address in M0:MON_AXI_ARADDR
    • Open M1:MON_AXI_ARADDRCONTROL and put a 1 for the value of MON_AXI_RVALID.
    • Set the Trigger Condition Equation to M0 && M1
  • Click the "Play" icon in the toolbar to arm the trigger.
  • Click the Green "P" button on the toolbar to disable polling. If polling is enabled you cannot program the device/
  • In XSDK program the device as normal. After the program terminates, click the "P" button in Chipscope to turn polling back on to pull in the waveform data that was triggered on (assuming there is any). Note that polling must be turned off again before each time you program the chip.