SMBus Relay with filter (named I2C filter in this page) is designed to function as an invisible relay from the point of view of both Controller and Target devices on the bus. It is meant to be directly attached to the Controller port and protect all Target devices against malicious traffic generated from the Controller port based on a allow list of allowable commands set by the host (such as CPU, FPGA RoT design, and others). The filter IP is the subset of the SMBus protocol. SMBSUS# and SMBALERT# are not supported.
Features
- Provides four interfaces, namely, AHB Lite, SMBus controller, SMBus target and Interrupt.
- Connected between a single controller (Primary) and multiple target (Secondary) devices.
- Protects the secondary devices from malicious traffic generated from the controller.
- Does not violate SMBus protocol and is transparent between the Primary and Secondary devices.
- Allows all the Read access.
