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Cut-thru operations require that the Ethernet port speeds be known. Port speed can be set manually by software or be automatically determined by the hardware. A zero port speed causes the port to be disabled for cut-thru operations, but does not disable the port. The port speed values are as follows:
When the CPSW_PN_SPEED_REG_k[8] AUTO_SPEED_EN bit is cleared, the port speed is written by software. When the CPSW_PN_SPEED_REG_k[8] AUTO_SPEED_EN bit is set, the port speed is automatically detected by the hardware.