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DM814x TRM: What's the usage of register related to OPP in control module section

Hi,

We found below register in control module section in DM814x TRM. Based on my understand, we changed the core voltage to support different OPP. Then what's the usage of these registers?

770h VDD_MPU_OPP_050 Ntarget value for OPP50. Section 3.2.65
774h VDD_MPU_OPP_100 Ntarget value for OPP100. Section 3.2.66
778h VDD_MPU_OPP_120 Ntarget value for OPP120. Section 3.2.67
77Ch VDD_MPU_OPP_166 Ntarget value for OPP166. Section 3.2.68
788h VDD_C674x_DSP_OPP_050 Ntarget value for OPP50. Section 3.2.69
78Ch VDD_C674x_DSP_OPP_100 Ntarget value for OPP100. Section 3.2.70
790h VDD_C674x_DSP_OPP_120 Ntarget value for OPP120. Section 3.2.71
794h VDD_C674x_DSP_OPP_166 Ntarget value for OPP166. Section 3.2.72
7A0h VDD_HDVICP_OPP_050 Ntarget value for OPP50. Section 3.2.73
7A4h VDD_HDVICP_OPP_100 Ntarget value for OPP100. Section 3.2.74
7A8h VDD_HDVICP_OPP_120 Ntarget value for OPP120. Section 3.2.75
7ACh VDD_HDVICP_OPP_166 Ntarget value for OPP166. Section 3.2.76
7B8h VDD_CORE_OPP_050 Ntarget value for OPP50. Section 3.2.77
7BCh VDD_CORE_OPP_100 Ntarget value for OPP100. Section 3.2.78
7C0h VDD_CORE_OPP_120 Ntarget value for OPP120. Section 3.2.79
7C4h VDD_CORE_OPP_166 Ntarget value for OPP166. Section 3.2.80

  • Hi Chris,

    Per my understanding, these registers can be used to overwrite the default nTarget value that comes from the eFuse.

    For a silicon/chip to support AVS/SR operation it needs to undergo "Characterization" and the target performance values (called as nTarget values) must be blown into the eFuses, such silicon is called "Characterized silicon".

    You can check here also:

    http://processors.wiki.ti.com/index.php/TI81XX_PSP_AVS_FAQ

    http://processors.wiki.ti.com/index.php/TI81XX_PSP_PM_AVS_Driver_User_Guide

    Regards,

    Pavel

  • Pavel,

    Thanks for reply.But the link you mentioned is for DM8168, not DM814x.