Point-to-point serial peripheral interface for data communication between devices configured in a daisy-chain

摘要

The present disclosure provides an improved point-to-point serial peripheral interface, a system comprising an improved point-to-point serial peripheral interface, and a method for use in a system comprising an improved point-to-point serial peripheral interface. A master comprises a SPI initiating port. Each slave comprises at least one SPI receiving port and at least one SPI forwarding port. The master provides a set of SPI signals to the SPI receiving port of the first slave in the chain, and the entire SPI signals are forwarded via the SPI forwarding port of each of the slaves until the SPI transaction reaches a target slave, which is identified by an in-band device addressing mechanism.

主权项

1. An improved point-to-point serial peripheral interface (SPI) for communicating data between a master and one or more slaves in a chain, wherein the master only connects to the first slave in the chain via said serial peripheral interface and wherein each of the slaves is configured to forward an entire set of SPI signals received from its preceding device in the chain to another slave in the chain until said set of SPI signals reaches to a target slave for processing a SPI transaction, wherein the SPI comprises:
data input and data output pins, each of which is configured to send and receive signals from a respective data input and data output line; a serial clock (SCLK) pin configured to receive a SCLK signal on a SCLK line; and a chip select (CS) pin configured to receive a CS signal on a CS line, and wherein upon receiving a read command, the target slave is configured to provide a slave ready signal on the SPI data output line to the master to indicate the target slave is ready to process the SPI transaction.