SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
The device supports only Adaptive Voltage Scaling (AVS) Class 0. This is a procedure for lowering the voltage on certain device power rails. AVS-Class0 attempts to normalize the power consumption across all devices. The optimal voltage for each AVS supported rail of each device is determined after analysis in the factory, based on the strength of the device during manufacturing. This value is written in the device eFuse where it can be read through dedicated registers.
The following supplies support AVS-Class0:
The AVS voltage for a supply is an E-fuse VID value located in the corresponding WKUP_VTM_VD_OPPVID_j register in the VTM module. VID Bit-field Values and Their Corresponding Voltage lists the mapping of the supplies to the VTM control registers. Separate VID values are fused for the different OPPs that the supply supports. For more information about OPPs suported by a supply in the device, see the device-specific DataSheet.
The AVS functionality can be enabled and performed by software after the primary boot of the device is finished. Typically, the voltage adjustment of AVS operation is done as secondary boot software.