| 摘要 |
Consistent with one example embodiment, communications systems ( 100 ), using a serial data transfer bus having a serial data line and a clock line used to implement a communications protocol, incorporate latched service requests. Methods for one or more slave devices to request service from a master device ( 130 ) involve detecting a condition that asserts a request for service signal ( 162 ), at a common node ( 150 ) independent from the serial data transfer bus, to a master device of the bus. The request for service is latched ( 164 ), within the slave, such that the request for service remains asserted regardless of a change in the detected condition. The request for service is de-asserted ( 166 ) in response to interrogation of the slave, using the serial data transfer bus, by the master device. Devices may be configured as general purpose Input/Output devices, CODEC arrangements, or other slave devices, and may conform to I2C and/or SMBus serial communication specifications.
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