6.6.4. Low-power control

The ATB synchronous bridge supports a power domain boundary on the slave interface, outside the bridge.

Before a domain is powered down, the power controller must ensure that the bridge is in a safe state by using the low-power interface. Failure to do this might cause incorrect operation when the domain is powered up again.

When a low power request is issued to the bridge by driving csysreq LOW, the bridge:

The bridge never requests powerup using the LPI, and always drives cactive LOW.

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