Apparatus for resetting power management enable register and resetting power management register based on an operating system instruction and output of power management enable register

A method for resetting one or more registers of a PC card controller, said method comprising the steps of:

• choosing a triggering signal that changes power levels when power is first applied to a power management enable (PME) register;
• generating a first reset signal based on said triggering signal;
• resetting said PME register with said first reset signal;
• generating a second reset signal;
• resetting a power management register with said second reset signal;
• and
• generating an enable or disable signal indicative of the reset state of said PME register, based at least in part, on said PME register receiving an operating system instruction.

A CardBus controller, comprising:

• power management enable (PME) registers;
• PCI and CardBus power management registers;
• a trigger signal that changes state when power is first applied to said PME, PCI and Cardbus registers;
• circuitry configured to receive said trigger signal and generate a first reset signal to reset said PME registers, wherein said PME registers generate a enable or disable signal in response to first reset signal;
• and
• said circuitry is also configured to receive said enable or disable signal and a conventional reset signal, said circuitry is also configured to generate a second reset signal for resetting said PCI and Cardbus registers if said enable or disable signal changes state, wherein said state change is based, at least in part, on said PME registers receiving an operating system instruction.