In order to prevent slave handling during undefined length bursts, the user can trigger the re-arbitration before the end of the incremental bursts. The re-arbitration period can be selected from the following Undefined Length Burst Type (ULBT) possibilities:
The use of undefined length16-beat bursts, or less, is discouraged since this decreases the overall bus bandwidth due to arbitration and slave latencies at each first access of a burst.
If the master does not permanently and continuously request the same slave or has an intrinsically limited average throughput, the ULBT should be left at its default unlimited value, knowing that the AHB specification natively limits all word bursts to 256 beats and double-word bursts to 128 beats because of its 1-Kbyte address boundaries.
Unless duly needed, the ULBT should be left at its default value of 0 for power saving.
This selection is made through the ULBT field of the Master Configuration Registers (MATRIX_MCFG).