uint32_tsairc:3;/*This field controls the source address insertion or replacement for all transmitted frames.Bit[30] specifies which MAC Address register (0 or 1) is used for source address insertion or replacement based on the values of Bits [29:28]: 2'b0x: The input signals mti_sa_ctrl_i and ati_sa_ctrl_i control the SA field generation. 2'b10: If Bit[30] is set to 0 the MAC inserts the content of the MAC Address 0 registers in the SA field of all transmitted frames. If Bit[30] is set to 1 the MAC inserts the content of the MAC Address 1 registers in the SA field of all transmitted frames. 2'b11: If Bit[30] is set to 0 the MAC replaces the content of the MAC Address 0 registers in the SA field of all transmitted frames. If Bit[30] is set to 1 the MAC replaces the content of the MAC Address 1 registers in the SA field of all transmitted frames.*/