Questions using McBSP to communicate between two C6713

We are using TI DSP 6713, and we communicate between two of them via McBSP, using SPRA455A document.

In my application:

1.      Data rate is 2M Baud.

2.      Packet size is about 2ms.

3.      Packets are sent every 10ms.

4.      Both McBSP transmit and receive clocks are coming out of on-board 2MHz oscillator.

5.      Link is AC coupled

6.      Modem is Biphase, at twice the Baud rate, used to overcome the AC coupling.

These are my questions:

1.      Would McBSP accept the external clock for both TX and RX?

2.      The software sends messages with DMA. Also the software kills the McBSP between messages. Would the data integrity be kept, so the biphase modem would not lose track?

3.   Would the McBSP do the byte or word alignment on the receive side, or should that be done with an external circuitry.

Thanks-

Rick