SPRUJB3C March 2024 – November 2025 AM67 , AM67A , TDA4AEN-Q1 , TDA4VEN-Q1
For every Ethernet port to be configured for fullduplex receive flow control, write a value of decimal 7 to the CPSW3_CPSW_NU_CPSW_NU_ETH_MAC_i_PN_MAX_BLKS_REG[7-0] RX_MAX_BLKS bit field, and a value of decimal 13 to the CPSW3_CPSW_NU_CPSW_NU_ETH_MAC_i_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 CPSW3_CPSW_NU_CPSW_NU_ETH_MAC_i_PN_MAC_CONTROL_REG register.