I understand you're looking for a paper or technical document related to the FT232R USB-UART driver in the context of Fortinet (likely FortiGate or other Fortinet hardware) — possibly involving an “exclusive” access issue or implementation.
The FT232R USB-UART driver on Fortinet platforms is present but exclusively constrained by: ft232r usb uart driver fortinet exclusive
When an FT232R-based console cable (e.g., Fortinet proprietary console-to-USB, or generic FTDI cable) is plugged into a FortiGate with USB host port (e.g., CP8, F-series, 100F+): I understand you're looking for a paper or