The PL is configured when the PLM sends the programmable device image (PDI) PL partition information to the configuration frame unit (CFU) during boot. The CFU interprets the data received via the PMC main AXI switch and generates commands to the configuration frame interface (CFI). The CFI bus transactions are sent to the CFRAMEs scattered throughout the programmable logic (PL). The CFU configures the PL functionality listed in the Programmable Logic Overview chapter.