SPRUIV7B May 2022 – September 2023 AM620-Q1 , AM623 , AM625 , AM625-Q1 , AM625SIP
Packets are received on two ports, one Ethernet port and one CPPI host port. Received packets have a received packet priority (0 to 7, with 7 being the highest priority).
The received packet priority is determined as follows:
The received packet priority is mapped through the receive ports associated packet-priority-to-header-packet-priority-mapping register (CPSW_PN_RX_PRI_MAP_REG) to obtain the header packet priority. The header packet priority is the hardware switch priority. The header packet priority is also used as the actual transmit packet priority if the VLAN information is to be sent on egress.
The header packet priority is mapped at each destination FIFO through the CPSW_PN_TX_PRI_MAP_REG register (header priority to switch priority mapping register) to obtain the hardware switch priority (hardware queue 0 through 7).