Broadcom Corporation

Sunil Pulikkal

Scott Sterling McDaniel

Chad William Kendall

Methods and apparatus for providing a bus interface are disclosed. An example bus interface includes a first power supply bus configured to distribute a first power supply voltage to first circuitry during a normal operating mode of the bus interface and power off during a low power operating mode of the bus interface. The example bus interface also includes a second power supply bus configured to distribute the first power supply voltage to second circuitry during the normal operating mode and distribute a second power supply voltage to the second circuitry during the low power operating mode. The example bus interface further includes a selection device coupled with the first power supply bus and the second power supply bus, where the selection device is configured to transition the bus interface between the normal operating mode and the low power operating mode in response to a received signal.

Bus interface with power management features

Methods and apparatus for providing a bus interface are disclosed. An example method for providing a bus interface includes operating first circuitry using a first power supply voltage in a normal operating mode, where the first circuitry includes at least a portion of datapath circuitry of the bus interface. The example method further includes powering down the first circuitry in a low power operating mode and operating second circuitry using the first power supply voltage in the normal operating mode. The example method also includes operating the second circuitry using a second power supply voltage in the low power operating mode. The second circuitry includes a power management control circuit adapted to receive a power management event indication signal. Responsive to the power management event indication signal, the control circuit provides at least one of an in-band power management indication and an out-of-band power management indication to one or more devices in a computing system. In the example method, the first and second power supply voltages may be provided by a single power supply or, alternatively, by multiple power supplies.

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Tustin, CA, United States of America

Sunil Pulikkal