Each AXI4-Stream interface operates in segmented mode to ensure high throughput over a range of traffic profiles. On the encryption path, the user data enters on the encryption ingress interface and leaves on the encryption egress interface. Similarly, on the decryption path, the user data enters on the decryption ingress interface and leaves on the decryption egress interface.
The following sections describe the AXI4-Stream signals and the signals to be used for the supported data rates. Each AXI4-Stream interface contains the typical signals along with a set of per-port signals (easily identified by the "_prtif_" in their name). The per-port signals contain supplementary information which is sampled/driven in the same cycle as the corresponding AXI4-Stream signals.
The HSC Subsystem can be dynamically reconfigured during runtime to support a user-selected mode of operation (for example, changing the data rate of a given port). In this case, the user logic must be careful to properly drive the correct signals depending on the mode of operation.