AXI and APB Isolation Block

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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2.4 English

Interconnect has AXI and APB isolation block (AIB) units that are responsible for functionally isolating the AXI/APB master from the slave in preparation for an AXI/APB master or slave to be powered down. The AIB manages AXI and APB interfaces during the isolation process resulting in a graceful transition to a power-down state. The AIB is transparent and offers zero latency during normal transactions. When isolation is requested, the AIB blocks all new transactions generated by a master until all the outstanding interactions are completed by the slave, then isolates the slave by responding to all new transactions on behalf of the slave.