7.6.4. Low-power features

The narrow timestamp asynchronous bridge supports 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 the rest of the timestamp interconnect to behave incorrectly, or corrupt timestamp values to be returned when the domain is powered up again.

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

When a power up request is issued to the bridge by driving csysreq HIGH, the bridge:

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

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