6.4 Bridge downstream Q-Channels

The downstream side of each bridge component provides three Q-Channel interfaces for power, clock, and external gate control.

Each Q-Channel implements the low-power interfaces that the AMBA® Low Power Interface Specification, Arm® Q-Channel and P-Channel Interfaces describes.

The power Q-Channel and clock Q-Channel implement a full Q-Channel interface. These interfaces enable the downstream side of the bridge to indicate when it requires clock and power.

The external-gating interface implements a partial Q-Channel interface that omits the QDENY and QACTIVE signals.

The presence of a synchronizer on the QREQn input of a Q-Channel is configurable. See the Arm® CoreLink™ SIE-300 AXI5 System IP for Embedded Configuration and Integration Manual for more information.

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