SPRUIV7B May 2022 – September 2023 AM620-Q1 , AM623 , AM625 , AM625-Q1 , AM625SIP
The VBUSM2AXI bridge has a timeout counter that expires when no AXI transaction can be sent to the DDR controller or no AXI response is received from the controller for a programmed time interval. The counter only counts when there are pending commands in the bridge and the AXI bus is idle. Therefore, the bridge will not time out during low-power modes. The time interval can be programmed by writing to the DDRSS_V2A_BUS_TO[23-0] BUS_TIMER field.
Upon the expiry of the counter, the bridge terminates all pending commands in its internal FIFOs, returns error responses, sets the DDRSS_V2A_INT_RAW_REG[2] TOERR bit and triggers the DDR0_DDRSS_V2A_OTHER_ERR_LVL_0 interrupt.
After a timeout occurs, the bridge terminates any new commands received and returns error response. Writing a value of 0x0 to the DDRSS_V2A_BUS_TO[23-0] BUS_TIMER field exits the timeout mode. The other method to exit the timeout mode is to reset the DDRSS0, thus resetting the VBUSM2ZXI bridge, the DDR controller, and the DDR PHY.