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AssigneeAdvanced Micro Devices, Inc.
InventorCharles Farmer
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An apparatus for controlling digital driver signals to accommodate a host system comprising a driver control circuit for generating a plurality of first stage gating signals in response to a data signal; a driver circuit generating a driver signal output in response to the plurality of first stage gating signals; and impedance control circuitry for controlling output impedance response of the driver circuit. The impedance control circuitry comprises a high signal impedance circuit for effecting such adjusting for low-to-high transitions of the driver signal, and a low signal impedance control circuit for effecting such adjusting for high-to-low transitions of the driver signal. The high signal impedance control circuit gates a first digital switching device operatively connected between the driver circuit output and a voltage source, and the low signal impedance control circuit gates a second digital switching device operatively connected between the driver circuit output and ground. The high signal impedance control circuit and the low signal impedance control circuit respond to transitions of the driver signal to enhance such transitions and establish the first and second digital switching devices in an off configuration when the transition is complete, thereby increasing output impedance of the driver circuit. In an alternate embodiment, the high signal impedance control circuit and the low signal impedance control circuit respond to completion of transitions of the driver signal to appropriately gate the first and second digital switching devices to lower output impedance of the driver circuit.
An apparatus for controlling digital driver signals to accommodate a host system;
Dependencies are inferred from the claim text.