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Time-Sensitive Networking (TSN) is a set of standards under development by the Time-Sensitive Networking task group of the IEEE 802.1 working group.

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You would observe that every second 12 ST packets are sent of which 8 packets are sent in the 100us of 10 ms cycle and the rest 4 packets are sent in the next cycle.

As we can see in the above picture, from 4th packet until 11th packet (8 packets) are received sequentially and the next packet starts after 10ms delay (packet no. 12).

Running IPIC:

IP interception translates the transmit packet with the configured source, destination MAC addresses, VLAN ID and PCP values if the packets' IPv4 tuples (source IP, destination IP, DSCP, protocol, source port number and destination port number) match. IPIC module maintains hash entries of IPv4 tuples and if the out-going packets' tuple data match with that of hash entries , translates the IP stream.

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axi_intc_0: interrupt-controller@80001000 {

                        #interrupt-cells = <2>;

                        clock-names = "s_axi_aclk";

                        clocks = <&misc_clk_1>;

                        compatible = "xlnx,axi-intc-4.1", "xlnx,xps-intc-1.00.a";

                        interrupt-controller ;

                        interrupt-names = "irq";

                        interrupt-parent = <&gic>;

                        interrupts = <0 89 4>;

                        reg = <0x0 0x80001000 0x0 0x1000>;

                        xlnx,kind-of-intr = <0x8000>;

                        xlnx,num-intr-inputs = <0x10>;

                };



Known issues and troubleshooting

→ Repeated ping on broadcast packets can be observed when TSN boards are connected in a a loop configuration. This can be observed with 2 back to back boards or more where is a possibility of a loop in the network. A standard solution for this is STP enabled (see below). This is NOT specific to TSN systems and it is common precaution for any network with possible loops.

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