uint32_tlpitxa:1;/*This bit controls the behavior of the MAC when it is entering or coming out of the LPI mode on the transmit side.If the LPITXA and LPIEN bits are set to 1 the MAC enters the LPI mode only after all outstanding frames and pending frames have been transmitted. The MAC comes out of the LPI mode when the application sends any frame.When this bit is 0 the LPIEN bit directly controls behavior of the MAC when it is entering or coming out of the LPI mode.*/