Anytime, host evaluates that there are too many retries happening on the bus, then to serve other end-points, it may terminate the burst prematurely.
The following are the ways Host can terminate the Burst:
1. Host terminates the burst prematurely by sending ACK token with NumP = 0 and Retry bit set
2. Host comes and starts transfers on to a different end-point when there is data still pending to be acknowledged.