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AM3354: MACCONTROL register IFCTL_A and IFCTL_B?

Part Number: AM3354

The CPSW has two SL register set: CPSW_SL1 and CPSW_SL2, each MACCONTROL register has IFCTL_A and IFCTL_B to configure operation speed, what is mean of _A and _B? I understand each port should only have one port, why has 2?