International Business Machines Corporation

Mediatek Corporation

Huajun Wen

Michael Stephen Floyd

Nobuo Kojima

Wei T Huang

Malcolm Scott Allen-Ware

Lee Evan Eisen

Alan J Drake

Tingdong Zhou

Thomas Strach

Aleksandr Kaplun

Edmund Juris Sprogis

Hung Cai Ngo

Kevin John Nowka

Hugh Thomas Mair

Brian King Flachs

Seongwon Kim

Norman Karl James

Joshua D Friedrich

John Mack Isakson

John Thomas Badar

John R Ripley

Rudolf Ludeke

Hsin-Chen Chen

A dynamic power meter circuit receives a set of clock signals. The clock signals are summed by a clock sum adder, thereby generating a clock sum value. A dynamic power meter output value is generated based at least in part on the clock sum value. In one particular example, a dynamic power meter circuit receives clock signals and from them generates a clock sum model sub-value. The dynamic power meter circuit also receives event signals, and from them generates an architectural event model sub-value. A corresponding pair of clock sum model sub-value and architectural event model sub-value are then ratiometrically combined, thereby generating a dynamic power meter output value. Due to the use of both event signals and clock signals, a stream of dynamic power meter output values is generated that more closely tracks actual dynamic power of a circuit being monitored.

Dynamic power meter with improved accuracy and single cycle resolution

In the management of a processor, logical operation activity is monitored for increases from a low level to a high level during a sampling window across multiple cores sharing a common supply rail, with at least one decoupling capacitor along the common supply rail. Responsive to detecting the increase in logical operation activity from the low level to the high level during the sampling window, the processor limits the logical operations executed on the cores during a lower activity period to a level of logical operations set between the low level and a medium level, where the medium level is an amount between the low level and the high level. Responsive to the lower activity period ending, the processor gradually decreases the limit on the logical operations to resume normal operations.

Reducing power grid noise in a processor while minimizing performance loss

A mechanism is provided for minimizing power consumption for operation of a fixed-frequency processing unit. A number of timeslots are counted in a time window where throttling is engaged to the fixed-frequency processing unit. The number of timeslots where throttling is engaged is divided by a total number of timeslots within the time window, thereby producing a performance loss (PLOSS) value. A determination is made as to whether determining whether the (PLOSS) value associated with the fixed-frequency processing unit is greater than an allowed performance loss (APLOSS) value. Responsive to the PLOSS value being less than or equal to the APLOSS value, a decrease in voltage supplied to the fixed-frequency processing unit is initiated.

Minimizing power consumption for fixed-frequency processing unit operation

A voltage regulator module (VRM) includes a first interface configured to couple to a first substrate interface at a first voltage. The VRM also includes a second interface configured to couple to a first processor interface at a second voltage. A first regulator module couples to the first interface and to the second interface. The first regulator module is configured to receive power at the first interface, to convert power to the second voltage, and to deliver power to the first processor interface at the second voltage. A method for providing power to a processor includes receiving power from a first substrate interface at a first voltage. The received power is regulated to generate power at a second voltage. The regulated power is provided to a processor at a first processor interface coupled to the processor. The processor interface delivers power to a logic group of a plurality of logic groups of the processor.

Processor voltage regulation

A more efficient method of counting the number of zeros in a 4-bit value generates three output bits (q, qand q) from four input bits (a, a, aand a) according to the logic equations qnot(aaaa), qnot(aa), qa(not a)+not(aa). These output bits yield the number of non-significant (leading or trailing) zeros in the 4-bit value. The invention may be implemented in a 16-bit zero counter having four 4-bit decoders, but is applicable to any number of zero counters. The output bits from the four 4-bit decoders can be combined to yield a 5-bit count whose most significant bit is a one when all input bits from all four of the 4-bit blocks are zero. A multiplexer stage derives two outputs based on a portion of the decode bits. For wider counters, the output stage uses four AOI21 gates to merge additional decode bits from a next lower 16-bit zero counter.

Redundancy-free circuits for zero counters

A binary adder circuit including a carry logic circuit and selection logic. The carry logic circuit uses group generate and propagate signals to produce complementary carry signals. The selection logic produces one of two presums dependent on the complementary carry signals. In a method for producing a carry logic circuit, a group generate logic function G=GOR GAND Pis to be performed. When G=C, G=C, arrival times of generate signals Gand G, are investigated. If Garrives before G, a complex AND-OR-INVERT gate is used, otherwise a cascaded pair of NAND gates is selected. To produce a complementary carry signal, a logic function G'=G&#x2032; AND G&#x2032; OR P&#x2032; is to be performed. If the generate signal G&#x2032; arrives before G&#x2032;, a complex OR-AND-INVERT gate is used, otherwise a cascaded pair of NOR gates is selected.

Hybrid carry look ahead/carry select adder including carry logic generating complementary hot carry signals, and method for producing the carry logic

A disclosed method for designing a circuit having multiple conductors includes selecting first and second circuit operating points corresponding to first and second circuit applications, respectively. A performance difference between circuit operation at the first and second circuit operating points is determined and used to compute a factor. The factor is applied to resistance values of the conductors, thereby producing modified conductor resistance values. A timing analysis of the circuit is performed using the modified conductor resistance values. A computer program product is described including computer program code for carrying out some or all of the operations of the method. An apparatus for designing the circuit includes means for applying the factor to the resistance values of the conductors and for performing the timing analysis of the circuit. A described timing analysis system includes a memory system and a central processing unit coupled to the memory system.

System and method for designing a circuit wherein a single timing analysis ensures adequate performance in multiple applications

A bus having improved performance over prior art busses is provided. In one embodiment, the bus includes a first wire having a plurality of intervals, a second wire having a plurality of intervals, and a third wire having a plurality of intervals. The first, second, and third wires are intertwined with each other. Some intervals of the wires include a buffer and some other intervals of the wires include an inverter. In some embodiments, the intervals of the wires that include the buffer are middle wires and in other embodiments, the intervals of the wires the include the buffer are outer wires.

Phase manipulation of intertwined bus signals for reduction of hostile coupling in integrated circuit interconnects

A phase splitter circuit including a clock delay section, a signal converter section and a signal generator section. The clock delay section uses a clock signal to produce first and second delayed clock signals that are time delayed versions of the clock signal. The second delayed clock signal is delayed more than the first. The signal converter section converts a static logic signal to a dynamic logic signal dependent upon the clock signal and the first delayed clock signal. The signal generator section produces a pair of complementary dynamic logic output signals dependent upon the dynamic logic signal and the first and second delayed clock signals. One of the output signals has a logic value equal to that of the static logic signal during an evaluation phase of the clock signal. A method for generating a pair of complementary dynamic logic signals from a static logic signal.

Dynamic phase splitter circuit and method for low-noise and simultaneous production of true and complement dynamic logic signals

A new D-type latch structure is disclosed which has an input data sampling circuit and a symmetrical cross coupled latching circuit. The clock is delayed a predetermined time through an inverter circuit. The clock and the delayed inverted clock are used to generate a clock window time during which time the data input state and the inverted data input state are asserted on the latch output and complementary. The latch outputs are cross-coupled to pull-up and pull-down circuitry in each output circuit stage. A common pull-down transistor may be used to further reduce devices and to improve path delays from clocks to the latch outputs. The clock window assertion of states of the data inputs to the changing latch output is enhanced by the cross-coupled feedback of the latch outputs to improve the differential transition timings of the latch outputs. The D-type latch has fewer transistors and better delay, and more precise transition skew over prior art designs.

Edge triggered latch with symmetrical paths from clock to data outputs

An edge-triggered latch that incorporates pass-transistor logic (PTL) in the data and clock generation paths. In accordance with one embodiment, an edge-triggered latch includes a data input and at least one data path PTL transistor that passes data from the data input into a storage node in response to a latch trigger signal. A latch trigger circuit generates the latch-trigger signal in response to a clock signal transition.

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Austin, TX, United States of America

Huajun Wen