FIR module supports burst transfers of size SINGLE, INCR4 and INCR8. Burst transfers are always of size SINGLE when the modifier is other than 1.
DMA supports burst transfers only when the modifier is 1, for any other modifier values, single accesses are performed. The burst size is not user configurable and is chosen by the processor for optimal performance.
The maximum burst size is 8 and the minimum is 1. Any other modifier value will result in a poorer performance.