The present invention provides for controlling the power consumption of an
element. A first power control command is issued by software for the
element. It is determined if the power control command corresponds to an
allowable power control state for that element as defined by the
hardware. If the power control command is not an allowable power control
state for that element, the hardware sets the power control at a higher
level than the power control state issued by the software. A hierarchy of
power consumption is defined for different elements of a chip by
software, which provides the minimum level of power consumption by any
element or sub-element on a chip.