2.2.5 Q-Channel interface for clock

The Q‑Channel interface for clock is a control port for managing the system clock.

GFC-100 can accept or deny a request from the clock controller to turn off all operations that are using the clock.

Activity indication

GFC-100 uses the qactive_clk signal to indicate it has an activity that is using the clock. When GFC-100 asserts qactive_clk, the clock controller keeps the clock enabled.

Accepting a request

When GFC-100 has no activity, it accepts the quiescence request for the clock, and enters the Q_STOPPED state.

Denying a request

When the clock controller requests the clock to be disabled, if the activity indication is HIGH, GFC-100 denies the request.

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