International Business Machines Corporation

Stanley Everett Schuster

Peter William Cook

Barbara A Chappell

Richard Edward Matick

Terry I Chappell

Pradip Bose

Hans Mikael Jacobson

Prabhakar Nandavar Kudva

Philip George Emma

Badih El-Kareh

Alper Buyuktosunoglu

Lloyd Andre Walls

Byron Lee Krauter

Richard L Kleinhenz

Lewis M Terman

Mahmut K Ebcioglu

David M Brooks

Michael K Gschwind

Tak H Ning

Wei Hwang

Vijayalakshmi Srinivasan

Gary Bela Bronner

Peter Juergen Klim

Bruce Martin Fleischer

Jude A Rivers

Daniel Lawrence Stasiak

William Todd Boyd

Thomas James Heller, Jr

Victor V Zyuban

Tai Anh Cao

Gerald Lebizay

Thekkemadathil V Rajeevakumar

Satyajit Dutta

Andrew Douglas Davies

Michael Ignatowski

Thanh D Trinh

David H Albonesi

Thai Q Nguyen

Yeong-Chang L Lien

James Thomas Parrish

Kioshi Maruyama

Daniel M Citron

A method and structure of reducing power consumption in a microprocessor includes at least one storage structure in which the activity of the storage structure is dynamically measured and the size of the structure is controlled based on the activity. The storage structure includes a plurality of blocks, and the size of the structure is controlled in units of block size, based on activity measured in the blocks. An exemplary embodiment is an adaptive out-of-order queue.

Adaptive issue queue for reduced power at high performance

In an embodiment of the present invention, a hierarchical differential sensing approach is effectuated wherein an array of 1T DRAM cells are organized in rows and columns in which the rows represent words and the columns represent bits of the word, each bit column having more than one pair of balanced, true and complement local bit lines, the local bit lines being connected to a pair of balanced, true and complement global bit lines by way of CMOS transistor switches.

eDRAM hierarchical differential sense AMP

An embodiment of the present invention is method of forming an array of 2 transistor DRAM cells organized in rows and columns in which the rows represent words and columns represent bits of the words, each bit column having a pair of balanced, true and complement bit lines, the bit lines being connected in a hierarchical bit line structure, comprising at least one local bit line pair and one global bit line pair, a sensing circuit connected to the global bit line pair detects a differential voltage transition on either line during a read access and provides a sensing strobe signal.

Hierarchical 2T-DRAM with self-timed sensing

An integrated circuit including a pipeline and a method of operating the pipeline. Each stage of the pipeline is triggered by one or more triggering events and are individually, and selectively, stalled by a stall signal. For each stage a stall signal, delayed with respect to the stall signal of a downstream stage, is generated and used to select whether the pipeline stage in question is triggered. A data valid signal propagating with valid data adds further selection, such that only stages with valid data are stalled.

Interlocked synchronous pipeline clock gating

An embodiment of the present invention is an SRAM memory array comprising memory cells with each cell containing seven devices, wherein the basic storage nodes, which store the true and complement of the data, are constructed from six devices, forming a cross-coupled flip-flop cell. One internal storage node of this cell being connected to a separate read-pass device which passes the state of this node to a local bit line (LBL) for single-ended sensing, with the gate of this separate read-pass device connected to a separate read-word line.

Fast, stable, SRAM cell using seven devices and hierarchical bit/sense line

A method of operating an integrated circuit including a pipeline and a method of stalling stages in the pipeline. Each stage of the pipeline is triggered by one or more triggering events and are individually, and selectively, stalled by a stall signal. For each stage a stall signal, delayed with respect to the stall signal of a downstream stage, is generated and used to select whether the pipeline stage in question is triggered. A data valid signal propagating with valid data adds further selection, such that only stages with valid data are stalled.

Method of stalling one or more stages in an interlocked synchronous pipeline

An embodiment of the present invention is an SRAM memory array comprising memory cells with each cell containing six devices, the storage nodes which store the true and complement of the data are constructed from a four device, cross coupled flip-flop cell, wherein one internal storage node of this cell is connected through an access pass gate to one local bit line (LBL), the second internal storage node connected in a like manner to a second LBL, each LBL connected to a limited number, e.g. 8 to 32 of other similar storage cells, the two LBLs each connected to the gate of a separate read head nFET for discharging to ground one of two previously precharged global read lines so as to pass the inverse of the signal on the LBL and thus on the read head gate to a global read/write bit line.

Hierarchical six-transistor SRAM

An embodiment of the present invention is an array of 2 transistor DRAM cells organized in rows and columns in which the rows represent words and columns represent bits of the words, each bit column having a pair of balanced, true and complement bit lines, the bit lines being connected in a hierarchical bit line structure, comprising at least one local bit line pair and one global bit line pair, a sensing circuit connected to the global bit line pair detects a differential voltage transition on either line during a read access and provides a sensing strobe signal.

eDRAM hierarchical differential sense amp

A hierarchical DRAM array, DRAM macro and logic chip including the DRAM macro embedded in the logic. DRAM array columns are segmented with a small number (e.g., 2-64) of cells connected to a local bit line (LBL) in each segment. Each LBL drives a sense device that drives a global read bit line (GRBL). When a cell storing a high is selected, the cell drives the LBL high, which turns the sense device on to drive the GRBL low. Segments may be used individually (as a macro) or combined with other segments sharing a common GRBL.

DRAM hierarchical data path

An integrated circuit (IC) including unit power control, leakage reduction circuit for controllably reducing leakage power with reduced LdI/dt noise in the IC and, an activity prediction unit invoking active/dormant states in IC units. The prediction unit determines turn on and turn off times for each IC unit. The prediction unit controls a supply voltage select circuit selectively passing a supply voltage to a separate supply line at the predicted turn on time and selectively blocking the supply voltage at the predicted turn off time.

Processor with low overhead predictive supply voltage gating for leakage power reduction

A synchronous integrated circuit such as a scalar processor or superscalar processor. Circuit components or units are clocked by and synchronized to a common system clock. At least two of the clocked units include multiple register stages, e.g., pipeline stages. A local clock generator in each clocked unit combines the common system clock and stall status from one or more other units to adjust register clock frequency up or down.

Processor with demand-driven clock throttling power reduction

Architectures, methods and systems are presented which combine a multiple of directories (e. g. Land Ldirectory) into a single directory, while still allowing the individual levels to use their own organization which is best for overall performance. This integration is performed without compromising the organization at each level. With some small additions to the Ldirectory, it is used simultaneously to perform both the Land Ldirectory functions. Additionally, the same organizational structure allows the Larray to serve both as a traditional Land simultaneous Larray. In one aspect of the present invention an architecture is provided for a first and second level memory hierarchy, or cache, including a first data storage array for the first level memory hierarchy; a second data storage array for the second level memory hierarchy, a single address translation directory combining the directories for the first and second level memory hierarchy into a single directory satisfying the organization requirements of both the first and second level memory hierarchy. Also provided is a system having three level memory hierarchy comprising: a single combined directory used to serve each of three separate storage arrays. Each of the storage arrays serves a respective level of the three level memory hierarchy wherein the organization of the various levels is not compromised by the use of the single combined directory.

Mapping and logic for combining L1 and L2 directories and/or arrays

Growing community of inventors

Granite Springs, NY, United States of America

Stanley Everett Schuster