Use Burst Transfers - 2021.2 English

Vitis Unified Software Platform Documentation: Application Acceleration Development (UG1393)

Document ID
UG1393
ft:locale
English (United States)
Release Date
2021-12-15
Version
2021.2 English

The first read or write request to global memory is expensive, but subsequent contiguous operations are not. Transferring data in bursts hides the memory access latency and improves bandwidth usage and efficiency of the memory controller.

Atomic accesses to global memory should always be avoided unless absolutely required. The load and store functions should be coded to always infer bursting transaction. This can be done using a memcpy operation as shown in the vadd.cpp file in the GitHub example, or by creating a tight for loop accessing all the required values sequentially, as explained in Interfaces in Developing Applications.