SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
PSI-L is a packet based protocol used to transfer data between several device modules. Еach transaction is routed based on thread ID value instead of physical address. All PSI-L interfaces are point to point direct connections to NAVSS0 or MCU_NAVSS0. All switching functions among the PSI-L based interfaces are done inside NAVSS0 and MCU_NAVSS0.
The PSI-L also has an event interface referred to as ETL, which is purely used to transfer event information. Only MCU_NAVSS0 has such event interface. It is connected to WKUP_DMSC0 and allows MCU_NAVSS0 to send event information to the interrupt aggregator inside WKUP_DMSC0.
Figure 10-224 shows an overview of all PSI-L connections within the device.
For more information about the PSI-L switch (PSILSS), see PSIL Subsystem (PSILSS).