QUALCOMM Incorporated
Multiple master, multi-slave serial peripheral interface

Abstract:

Systems, methods, and apparatus provide a multi-master serial peripheral interface. An apparatus is coupled to master and slave devices through an interconnect circuit using individual point-to-point SPI links. The interconnect circuit may be configured to couple pairs of devices selected from the plurality of devices through their individual point-to-point SPI links, enable a first transaction to be completed between a first pair of devices after a first master device in the first pair of devices initiates the first transaction, enable a second transaction to be completed between a second pair of devices after a second master device in the second pair of devices initiates the second transaction, and prevent a collision between the first master device and the second master device while the first pair of devices are engaged in the first transaction. The pairs of devices may be selected when they are participants in one or more transactions.