Top Level Settings - 2025.1 English - UG1308

The Top Level Settings Tab is shown in the following figure.

Packet Data Bus Width

AXI4-Stream Packet Data Bus Width: can be set to 32-bit, 64-bit, 128-bit, 256-bit, 512-bit, or 1024-bit.

Packet Rate

Packet rate in million packets/second. This parameter is relevant to any CAM tables that might be in your P4 program. A lower packet rate can result in a lower resource utilization for the CAMs. Vitis Networking P4 applies back-pressure on the s_axis interface if necessary to avoid exceeding the packet rate at the CAMs.

P4 File

Select Select P4 Example to allow the selection of P4 example designs from the P4 Example drop-down menu.

Alternatively, browse to select a P4 file in P4 File Location then click OK. The VNP4 IP invokes the P4C-VitisNetP4 compiler, automatically compiling the P4 file after is selected, and unlocks the other four tabs.

P4 Compile

Re-compiles the P4 for use when the selected P4 file has been edited by the user.

Calculate Latency

Calculates the total latency of the VNP4 system. This button appears, for convenience, on each tab. See Latency for additional information on the latency calculation.