# Serial Peripheral Interface ## Identification SPI and I²C are serial buses. Apple's Tristar/Lightning and `IOAccessory...` class names describe accessory detection, power, USB connection, and manager clients within IOKit-style registries. `CBTL1614` appears chip/controller-like; `AIM Bus` and `parrot` remain unresolved private labels. Public product names are not invented for private Apple class strings. ## Notebook evidence - [[Scanned_20260730-1659#PDF page 40 — Apple IOKit-style bus and accessory-controller inventory|PDF page 40: Apple IOKit-style bus and accessory-controller inventory]] — The strings resemble Apple IOKit registry class/property names captured from a device tree or diagnostic dump. SPI and I²C are low-level serial buses; Tristar is commonly associated with Lightning/USB accessory and charging negotiation; `IOAccessory…` names imply accessory-power and connection management. The precise roles of `CBTL1614`, `AIM Bus`, and `parrot` are not established by public documentation here. ## Relationships and overlays The source places this record in an evidence cluster with [[Apple Accessory Protocol|Apple Accessory Protocol]] · [[Apple Tristar|Apple Tristar]] · [[Inter-Integrated Circuit|Inter-Integrated Circuit]] · [[IOKit|IOKit]] · [[Lightning Connector|Lightning Connector]] · [[System Management Controller|System Management Controller]]. The occurrence contributes to the notebook's larger model of [[Identity Continuity|identity continuity]], [[Device Sovereignty|device sovereignty]], and [[Continuity Architecture|continuity architecture]]. ## Evidentiary status and open leads Correlate each registry string with an IORegistry dump and hardware model; resolve `parrot`, `AIM Bus`, and CBTL1614. ## Source - [[Scanned_20260730-1659|Scanned_20260730-1659]] ## Scanned_20260730-1314 overlay [[Scanned_20260730-1314#Scanned_20260730-1314.pdf — PDF page 12|Pages 12]]: SPI appears as a hardware-level interface in the USB, service-tool, and embedded-access taxonomy. **Relationship overlay:** [[Universal Asynchronous Receiver-Transmitter]] · [[Raspberry Pi Zero W]].