When any of the control Q-Channels request quiescence, the LPC-Q moves the device Q-Channels to the quiescent state. The device Q-Channels are brought out of quiescence when the last control Q-Channel exits quiescence.

The following figure shows the main interfaces on the LPC-Q.

You might use an LPC-Q where there is a cross-domain component that must be in a quiescent state whenever either of the associated domains goes to a quiescent power mode such as full retention or off, and there is no fixed relationship between the domains. For example, a cross-domain component such as a protocol domain bridge that operates across two power domains, where the bridge must be put into a quiescent mode before either domain is powered down.