A system-on-a-chip (SoC) comprising: a plurality of power controls, wherein each power control is configured to supply a unique supply signal having a supply voltage; and a plurality of power islands coupled to the plurality of power controls, wherein each power island is coupled to a corresponding power control to receive a single unique supply signal from the corresponding power control, wherein each power island comprises: a first segment comprising a first module which operates at a first segment supply voltage, wherein the first segment supply voltage is the supply voltage of the unique supply signal from the corresponding power control; a second segment comprising a second module which operates at a second segment supply voltage that is different from the first segment supply voltage of the first segment, the second segment further comprising: a supply power converter coupled between the corresponding power control and second module, wherein the supply power converter is configured to convert the unique supply signal to a different internal supply signal (VDDi); a reference power converter coupled between the second module and a reference signal, wherein the reference power converter is configured to convert the reference signal to a different internal reference signal (VSSi); and a conversion controller coupled to the supply power converter and the reference power converter, wherein the conversion controller is configured to control the supply power converter and the reference power converter to set the different supply level and the different reference level according to the second power segment supply voltage of the second module. a plurality of power controls, wherein each power control is configured to supply a unique supply signal having a supply voltage; and a plurality of power islands coupled to the plurality of power controls, wherein each power island is coupled to a corresponding power control to receive a single unique supply signal from the corresponding power control, wherein each power island comprises: a first segment comprising a first module which operates at a first segment supply voltage, wherein the first segment supply voltage is the supply voltage of the unique supply signal from the corresponding power control; a second segment comprising a second module which operates at a second segment supply voltage that is different from the first segment supply voltage of the first segment, the second segment further comprising: a supply power converter coupled between the corresponding power control and second module, wherein the supply power converter is configured to convert the unique supply signal to a different internal supply signal (VDDi); a reference power converter coupled between the second module and a reference signal, wherein the reference power converter is configured to convert the reference signal to a different internal reference signal (VSSi); and a conversion controller coupled to the supply power converter and the reference power converter, wherein the conversion controller is configured to control the supply power converter and the reference power converter to set the different supply level and the different reference level according to the second power segment supply voltage of the second module. a first segment comprising a first module which operates at a first segment supply voltage, wherein the first segment supply voltage is the supply voltage of the unique supply signal from the corresponding power control; a second segment comprising a second module which operates at a second segment supply voltage that is different from the first segment supply voltage of the first segment, the second segment further comprising: a supply power converter coupled between the corresponding power control and second module, wherein the supply power converter is configured to convert the unique supply signal to a different internal supply signal (VDDi); a reference power converter coupled between the second module and a reference signal, wherein the reference power converter is configured to convert the reference signal to a different internal reference signal (VSSi); and a conversion controller coupled to the supply power converter and the reference power converter, wherein the conversion controller is configured to control the supply power converter and the reference power converter to set the different supply level and the different reference level according to the second power segment supply voltage of the second module. a supply power converter coupled between the corresponding power control and second module, wherein the supply power converter is configured to convert the unique supply signal to a different internal supply signal (VDDi); a reference power converter coupled between the second module and a reference signal, wherein the reference power converter is configured to convert the reference signal to a different internal reference signal (VSSi); and a conversion controller coupled to the supply power converter and the reference power converter, wherein the conversion controller is configured to control the supply power converter and the reference power converter to set the different supply level and the different reference level according to the second power segment supply voltage of the second module.