SEQUENCED PULSE-WIDTH ADJUSTMENT IN A RESONANT CLOCKING CIRCUIT

摘要

A clock driver control scheme for a resonant clock distribution network provides robust operation by controlling a pulse width of the output of clock driver circuits that drive the resonant clock distribution network so that changes are sequenced. The clock driver control circuit controls the clock driver circuits in the corresponding sector according to a selected operating mode via a plurality of control signals provided to corresponding clock driver circuits. The pulse widths differ for at least some of the sectors during operation of digital circuits within the integrated circuit having clock inputs coupled to the resonant clock distribution network. The different pulse widths may be a transient difference that is imposed in response to a mode or frequency change of the global clock that provides an input to the clock driver circuits.

主权项

1. A method of operating an integrated circuit having a resonant clock distribution network, the method comprising:
generating a distributed clock signal within the resonant clock distribution network by driving the resonant clock distribution network with a plurality of clock driver circuits that receive a clock input from a global clock signal and have outputs connected to corresponding locations within sectors of the resonant clock distribution network; controlling pulse widths of individual ones of the plurality of clock drivers according to a plurality of control signals provided to corresponding ones of the plurality of clock driver circuits, wherein the pulse widths of the individual clock drivers differ for at least some of the sectors during operation of digital circuits within the integrated circuit having clock inputs coupled to the resonant clock distribution network; selecting an operating mode or frequency of the resonant clock distribution network; and generating the plurality of control signals such that, responsive to the selecting having selected a new operating mode or a new frequency, the pulse widths of the individual clock driver circuits are set to first pulse width values for a predetermined interval after the selecting selects the new operating mode or the new frequency, and wherein the pulse widths of the individual clock driver circuits are set to second pulse width values that differ from the first pulse width values after the predetermined interval has expired, wherein the individual clock driver circuits are operated at the first pulse width values during the predetermined interval and operated at the second pulse width values after the predetermined interval and until the first control logic again changes the operating mode or the frequency of the resonant clock distribution network.