原子访问简单说:原子不可分割,因此原子访问具有不可分割的特性。因此,若将某一部分的32bits当做一个原子,如果执行原子访问时就不能将突发读变成16bits。
single copy atomicity size最小原子单位
手册原话:The AXI4 protocol does not require a specific single-copy atomicity size and systems can be designed to support different single-copy atomicity sizes.越复杂最小原子单位中的bit越多
Exclusive accesses
- The exclusive access mechanism can provide semaphore-type operations without requiring the bus to remain dedicated to a particular Manager for the duration of the operation.信号量类型操作不会影响总线访问延迟或最大可实现带宽。
- The AxLOCK signals select exclusive access, and