AT32UC3C MACB setup

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Hello. Trying to set up an MACB loopback. Created descriptors of buffers for transmit and receive. In NCR, receive, transmit, and local loop are setted. In the NSR is active idle. For activation, I enable TSTART in NCR. The TBQP address changes, but the descriptors themselves are unchanged. In TSR, the TGO is established. What am I doing wrong? Each transmitted descriptor has the 15 (LAST) bit set (3 frames with one buffer, right?). The third descriptor has the WRAP set. USED cleared in all descriptors.