Qualcomm Incorporated

Nakul Manjunath

Utpal Barman

Richard Nouri

Subramanya N N

A principal device includes a protocol controller coupled, via a serial bus, to one or more subordinate devices. The serial bus includes a clock wire and a data wire. The protocol controller is configured to send, on the data wire, a read command addressed to a subordinate device to initiate a read transaction. The protocol controller is also configured to modify a clock signal on the clock wire to extend a bus park cycle period. The bus park cycle period is extended based on a data preparation delay associated with the subordinate device. The protocol controller is further configured to, subsequent to the bus park cycle period, read data from the data wire during the read transaction.

Configurable bus park cycle period

A subordinate device includes a local clock and a protocol controller. The protocol controller is coupled to a bus that includes a data wire. The protocol controller is configured to receive, on the data wire from a principal device, a read command addressed to the subordinate device indicating initiation of a read transaction. The protocol controller is also configured to, after a delay window, send synchronization pulses to the principal device based on the local clock, where a duration of the delay window is greater than a clock cycle of the local clock. The protocol controller is further configured to, after sending the synchronization pulses, send data on the data wire to the principal device based on the local clock during the read transaction.

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Bengaluru, India

Nakul Manjunath