US 8,575,964 B2Granted

Inactivity triggered self clocking logic family

AssigneeInternational Business Machines Corporation

InventorsKerry Bernstein, Kenneth J. Goodnow, Clarence R. Ogilvie, John Sargis, Jr., Sebastian T. Ventrone, Charles S. Woodruff

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Abstract

Localized logic regions of a circuit include a local comparator electrically connected to a local resistive voltage circuit, to a local resistive ground circuit, and to a local register structure. The local comparator supplies a clock pulse to the local register structures when the local reference voltage is below a local voltage threshold. Activity in the local combinatorial logic structure causes the local reference voltage to drop below the local reference voltage independently of changes in the global reference voltage causing the comparator to output the clock pulse (with sufficient delay to allow the logic results to be stored in the registers only after setup times have been met in the local logic devices). This eliminates the need for a clock distribution tree, thereby saving power when there is no activity in the local combinatorial logic structure.

Claims20

Dependent claims

An integrated circuit structure comprising at least one localized region, each said localized region comprising:

at least one local voltage circuit electrically connected to a global voltage circuit, said local voltage circuit comprising voltage circuit resistors isolating said local voltage circuit from said global voltage circuit, and said local voltage circuit outputting a local reference voltage;
at least one local ground circuit electrically connected to a global ground circuit, said local ground circuit comprising ground circuit resistors isolating said local ground circuit from said global ground circuit;
a local capacitor connected to said local voltage circuit and said local ground circuit;
local logic devices forming at least one local combinatorial logic structure, said local combinatorial logic structure being electrically connected to said local voltage circuit and to said local ground circuit, and said local combinatorial logic structure drawing said local reference voltage from said local voltage circuit;
local storage devices forming at least one local register structure, said local register structure being electrically connected to said local voltage circuit and to said local ground circuit, and said local register structure drawing said local reference voltage from said local voltage circuit;
and
a local comparator electrically connected to said local voltage circuit, to said local ground circuit, and to said local register structure, said local comparator supplying a clock pulse to said local register structure when said local reference voltage is below a local voltage threshold.

4 more elements

An integrated circuit structure comprising:

a plurality of localized regions that are physically separate from each other;
at least one global voltage circuit electrically connected to said localized regions and supplying a global reference voltage to said localized regions;
and
at least one global ground circuit electrically connected to said localized regions and connecting said localized regions to a global ground voltage,
each of said localized regions comprising:
at least one local voltage circuit electrically connected to said global voltage circuit, said local voltage circuit comprising voltage circuit resistors isolating said local voltage circuit from said global voltage circuit, and said local voltage circuit outputting a local reference voltage;
at least one local ground circuit electrically connected to said global ground circuit, said local ground circuit comprising ground circuit resistors isolating said local ground circuit from said global ground circuit;
a local capacitor connected to said local voltage circuit and said local ground circuit;
local logic devices forming at least one local combinatorial logic structure, said local combinatorial logic structure being electrically connected to said local voltage circuit and to said local ground circuit, and said local combinatorial logic structure drawing said local reference voltage from said local voltage circuit;
local storage devices forming at least one local register structure, said local register structure being electrically connected to said local voltage circuit and to said local ground circuit, and said local register structure drawing said local reference voltage from said local voltage circuit;
and
a local comparator electrically connected to said local voltage circuit, to said local ground circuit, and to said local register structure, said local comparator supplying a clock pulse to said local register structure when said local reference voltage is below a local voltage threshold.

9 more elements

An integrated circuit structure comprising:

a plurality of localized regions that are physically separate from each other;
at least one global voltage circuit electrically connected to said localized regions and supplying a global reference voltage to said localized regions;
and
at least one global ground circuit electrically connected to said localized regions and connecting said localized regions to a global ground voltage,
each of said localized regions comprising:
at least one local voltage circuit electrically connected to said global voltage circuit, said local voltage circuit comprising voltage circuit resistors isolating said local voltage circuit from said global voltage circuit, and said local voltage circuit outputting a local reference voltage;
at least one local ground circuit electrically connected to said global ground circuit, said local ground circuit comprising ground circuit resistors isolating said local ground circuit from said global ground circuit;
a local capacitor connected to said local voltage circuit and said local ground circuit;
local logic devices forming at least one local combinatorial logic structure, said local combinatorial logic structure being electrically connected to said local voltage circuit and to said local ground circuit, and said local combinatorial logic structure drawing said local reference voltage from said local voltage circuit;
local storage devices forming a plurality of local register structures, said local register structures being electrically connected to said local voltage circuit and to said local ground circuit, and said local register structures drawing said local reference voltage from said local voltage circuit;
a local comparator electrically connected to said local voltage circuit, to said local ground circuit, and to said local register structures, said local comparator supplying a clock pulse to said local register structures only when said local reference voltage is below a local voltage threshold.

8 more elements

Dependencies are inferred from the claim text.