Chapter 6

Atomic Accesses

This chapter describes how the AXI protocol implements exclusive access and locked access mechanisms. It contains the following sections:

•About atomic accesses on page 6-2

•Exclusive access on page 6-3

•Locked access on page 6-7.

Atomic Accesses

6.1About atomic accesses

To enable the implementation of atomic access primitives, the ARLOCK[1:0] or AWLOCK[1:0] signal provides exclusive access and locked access. Table 6-1 shows the encoding of the ARLOCK[1:0] and AWLOCK[1:0] signals.

Table 6-1 Atomic access encoding