Atomic accesses with the lock signal

The AxLOCK signal is used to indicate when atomic accesses are being performed. See Atomic
accesses for more information and an explanation of the concept and operation of exclusive access
transfers.
The AXI protocol provides two mechanisms to support atomicity:
• Locked accesses A locked transfer locks the channel, which remains locked until an unlocked
transfer is generated. Locked accesses are similar to the mechanism supported with the AHB
protocol. When a manager uses the AxLOCK signals for a transaction to show that it is a
locked transaction, then the interconnect must ensure that only that manager can access the
targeted subordinate re