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Serial data bus for different modes of operation (SCI, SPI and buffered SPI) and methods for a serial peripheral interface in a serial data bus
Serial data bus for different modes of operation (SCI, SPI and buffered SPI) and methods for a serial peripheral interface in a serial data bus
The aim of the Chrysler Collision Detector (CCD) Bus System is to allow multiple microprocessors to easily communicate with each other over a common pair of wires (called a bus) using a scheme similar to a telephone party line. All microprocessors connected to the bus are able to receive all messages transmitted on the bus. Any microprocessor with a message to transmit on the bus waits until any current user is finished before attempting to use it. Whenever the bus is available, its use is allocated on a first-come, first-serve basis (i.e., whichever microprocessor first begins transmitting its message on the bus after any previous message finishes gets the use of the bus). If, however, multiple microprocessors attempt to begin transmitting their messages on the bus at exactly the same time, then the message with the highest priority wins the use of the bus. All messages have unique message priority values and each message is transmitted by only one microprocessor. The subject invention provides the ability to communicate with a SCI port, a SPI port or a buffered SPI port. This allows communication with any device configured with any one of these ports, all on the same bus.;In a communication system for the transmission of messages through a data bus between one or more user microprocessors coupled to the data bus, the user microprocessors having either a serial communications interface (SCI) port or a serial peripheral interface (SPI) port along with a clock port and an input/output port, the user microprocessors being coupled ton the data bus by a bus interface integrated circuit, a method to transmit and receive data in an SPI mode of operation in conjunction with a method of arbitrating data on the data bus, and a method to transmit and receive data in a buffered serial peripheral interface (SPI) mode of operation in conjunction with a method of arbitrating data on the data bus.
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