5.2.3. Low-power features

The APB asynchronous bridge supports an optional LPI to a power controller. The power controller can request the master interface of the bridge to go into low-power state through the LPI. The bridge enters low-power state when there are no pending transactions.

When the bridge is in low-power mode and it receives a new transaction, it generates a wake-up request on the LPI by driving cactive HIGH and issues the transaction through its master interface when the power controller brings the master interface out of low-power state. The bridge stalls the transaction on the slave interface until the master interface is brought out of low-power state, and ensures that there is no loss of data transferred through the bridge.

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