Isolation interface for master-slave communication protocols

摘要

An apparatus for communication using a master-slave communication protocol includes a master circuit and a slave circuit configured to communicate with each other using a master-slave communication protocol. The apparatus also includes an interface circuit coupled to the master and slave circuits. In response to a first control signal having a first value, the interface circuit forwards messages received from the master circuit to the slave circuit and forwards responses received from the slave circuit to the master circuit. In response to the first control signal having a second value, the interface circuit prevents messages received from the master circuit from being forwarded from the master circuit to the slave circuit.

主权项

1. An apparatus, comprising:
a master circuit configured and arranged to communicate using a master-slave communication protocol; a slave circuit configured and arranged to communicate with the master circuit using the master-slave communication protocol; and an interface circuit coupled to the master and slave circuits and configured and arranged to:
in response to a first value of a first control signal and any value of a second control signal that indicates an isolation type:
forward messages received from the master circuit to the slave circuit; andforward responses received from the slave circuit to the master circuit;in response to a second value of the first control signal and a first value of the second control signal:
prevent messages received from the master circuit from being forwarded from the master circuit to the slave circuit;provide an error response to the master circuit for messages received from the master circuit; andin response to the second value of the first control signal and a second value of the second control signal:
prevent messages from being forwarded from the master circuit to the slave circuit; andprovide no error response to the master circuit.