SPRUIM2H May 2020 – October 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
For every Ethernet port to be configured for fullduplex receive flow control, write a value of decimal 7 to the CPSW_PN_MAX_BLKS_REG[7-0] RX_MAX_BLKS bit field, and a value of decimal 13 to the CPSW_PN_MAX_BLKS_REG[15-8] TX_MAX_BLKS register. This re-allocation allows for flow control runout on the receive FIFO at the expense of FIFO memory on the Ethernet transmit side. 10/100Mbps half-duplex collision based receive flow control does not need this re-allocation. Receive flow control is enabled by the RX_FLOW_EN bit in the CPSW_PN_MAC_CONTROL_REG register.