The first part of the PID contains a unique Manufacturer ID. Companies need not be MIPI Alliance members to be assigned a unique Manufacturer ID.

The second part of the PID normally contains a part number (which is normally divided up into general and specific part info for that vendor), as well as possibly an instance number which allows for multiple instances of the same device on the same I3C Bus. The instance ID is usually fed from a pin-strap, fuse(s), or non- volatile memory (NVM).

A random number may be used for the part number, although normally only for test mode, as set by the Controller using the ENTTM (Enter Test Mode) CCC. When a Device that supports random values enters the test mode, the PID[31:0] bits are randomized. When the Controller exits the test mode, the Devices reset bits PID[31:0] to their default value.

Note: The use of a random number in the PID allows for many instances of the same Device to be attached to a gang programmer/tester, relying on the random number to uniquely give each a Dynamic Address. However, the random number should not be used for typical I3C applications where I3C Devices must be uniquely identified, especially by higher-level software that runs on the Application Host that is driving the I3C Controller.

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