Sequenced pulse-width adjustment in a resonant clocking circuit
First Claim
1. An integrated circuit including a resonant clock distribution network, comprising:
- a plurality of clock driver circuits having outputs for driving drive points of sectors of the resonant clock distribution network and having a clock input coupled to a global clock signal, wherein the clock driver circuits include pulse width controls responsive to a pulse width control input;
a clock driver control circuit that controls pulse widths of individual ones of the plurality of clock drivers according to a plurality of control signals provided to the pulse width control inputs of 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;
first control logic for selecting an operating mode or a frequency of the resonant clock distribution network; and
second control logic for 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.
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Accused Products
Abstract
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.
87 Citations
11 Claims
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1. An integrated circuit including a resonant clock distribution network, comprising:
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a plurality of clock driver circuits having outputs for driving drive points of sectors of the resonant clock distribution network and having a clock input coupled to a global clock signal, wherein the clock driver circuits include pulse width controls responsive to a pulse width control input; a clock driver control circuit that controls pulse widths of individual ones of the plurality of clock drivers according to a plurality of control signals provided to the pulse width control inputs of 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; first control logic for selecting an operating mode or a frequency of the resonant clock distribution network; and second control logic for 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A resonant clock distribution network, comprising:
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a conductive grid comprising sectors; a plurality of clock driver circuits having outputs for driving drive points of sectors of the resonant clock distribution network and having a clock input coupled to a global clock signal, wherein the clock driver circuits include a pulse width control responsive to a pulse width control input; a clock driver control circuit that controls the pulse width of individual ones of the plurality of clock drivers according to a plurality of control signals provided to the pulse width control input of 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; first control logic for selecting an operating mode or frequency of the resonant clock distribution network; and second control logic for 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. - View Dependent Claims (8, 9, 10, 11)
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Specification