The HSC Subsystem presents all statistics increments through an external
interface. The external statistics consist of two sets of statistics increments: Set A
and Set B. These statistics are presented through two sets of pins identified by having
"_a" and "_b" suffixes in their names.
- SecY and SC stats in Set A are validated with signal
tx/rx_stats_valid_a - SecY statistics in Set B are validated with signal
tx/rx_secy_stats_valid_b - SC statistics in Set B are validated with signal
tx/rx_sc_stats_valid_b
The output update order follows the SecY (Channel) calendar. In Channelized
mode, the SecY order is user provided. In Fixed Port mode, the SecY order is the
repeating strings of the enabled port numbers. For example:
- In 4x100G mode, the SecY calendar order is the repeating strings
of
0-1-2-3. - In 2x200G mode, the SecY calendar is the repeating strings of
0-2, and so on.
Figure 1. TX External Statistics Interface
The operation of the RX external statistics interface is shown in the following figure.
Figure 2. RX External Statistics Interface
Note: Byte count updates are provided in 512-byte increments, and the remainder
at the end of packet is output coincident with the packet stats. Packet statistics
updates occur after the core has detected the end of packet.