Andrew J Tao

US Patent:

6941381, Sep 6, 2005

Filed:

Apr 16, 2001

Appl. No.:

09/835474

Inventors:

Michael McClary - Newark CA, US
Sharath Narahari - Pleasanton CA, US
Andrew Tao - Palo Alto CA, US

Assignee:

Redback Networks Inc. - San Jose CA

International Classification:

G06F015/16

US Classification:

709237, 709236, 709250, 370509

Abstract:

A method and apparatus for sync hunting signals is described. In one embodiment of the invention, a computer implemented method comprises receiving a signal and synchronization hunting concurrently for a first and second frame alignment pattern for a first and second alignment candidates.

US Patent:

6950446, Sep 27, 2005

Filed:

Apr 16, 2001

Appl. No.:

09/835979

Inventors:

Michael McClary - Newark CA, US
Sharath Narahari - Pleasanton CA, US
Andrew Tao - Palo Alto CA, US

Assignee:

Redback Networks Inc. - San Jose CA

International Classification:

H04J003/06

US Classification:

370503, 370542, 370470, 370386

Abstract:

A method and apparatus for simultaneously sync hunting signals is described. In one embodiment of the invention, a computer implemented method comprises initializing a first and second subset of a set of per-alignment state machines, receiving a first and second signal, and simultaneously sync hunting the first signal with the first subset of the set of per-alignment state machines and the second signal with the second subset of the set of per-alignment state machines.

US Patent:

7292254, Nov 6, 2007

Filed:

Dec 5, 2005

Appl. No.:

11/294791

Inventors:

Lordson L. Yue - Foster City CA, US
Vimal S. Parikh - Fremont CA, US
Andrew J. Tao - San Francisco CA, US

Assignee:

NVIDIA Corporation - Santa Clara CA

International Classification:

G09G 5/00
G06T 1/00

US Classification:

345620, 345619, 345418

Abstract:

Apparatus, system, and method for clipping graphics primitives are described. In one embodiment, a graphics processing apparatus includes a mapping unit and a clipping engine that is connected to the mapping unit. The mapping unit is configured to map a graphics primitive onto a canonical representation. The clipping engine is configured to perform a set of clipping operations with respect to the canonical representation.

US Patent:

7466322, Dec 16, 2008

Filed:

Aug 2, 2005

Appl. No.:

11/195389

Inventors:

Henry P. Moreton - Woodside CA, US
Vimal S. Parikh - Fremont CA, US
Andrew J. Tao - San Francisco CA, US

Assignee:

NVIDIA Corporation - Santa Clara CA

International Classification:

G09G 5/00

US Classification:

345620, 345623, 345621

Abstract:

Vertices defining a graphics primitive are converted into homogeneous space and clipped against a single clipping plane, the w=0 plane, to produce a clipped graphics primitive having vertices including w coordinates that are greater than or equal to zero. Rasterizing a graphics primitive having a vertex with a w coordinates that is greater than or equal to zero is less complex than rasterizing a graphics primitive having a vertex with a w coordinate that is less than zero. Clipping against the w=0 plane is less complex than conventional clipping since conventional clipping may require that the graphics primitive be clipped against each of the six faces of the viewing frustum to produce a clipped graphics primitive.

US Patent:

7542046, Jun 2, 2009

Filed:

Jun 26, 2006

Appl. No.:

11/475599

Inventors:

Lordson L. Yue - Foster City CA, US
Vimal S. Parikh - Fremont CA, US
Andrew J. Tao - San Francisco CA, US

Assignee:

Nvidia Corporation - Santa Clara CA

International Classification:

G06F 12/00

US Classification:

345564, 345531, 345620

Abstract:

An apparatus, system, and method for clipping graphics primitives are described. In one embodiment, a graphics processing apparatus includes a clipping unit, a read-only memory that is connected to the clipping unit, a read-write memory that is connected to the clipping unit, and an addressing unit that is connected to the read-only memory and the read-write memory. The read-only memory is configured to store a clipping program, and the read-write memory is configured to store a patch program. The addressing unit is configured to selectively address one of the read-only memory and the read-write memory based on a set of input conditions.

US Patent:

7593021, Sep 22, 2009

Filed:

Sep 13, 2004

Appl. No.:

10/939624

Inventors:

Andrew J. Tao - San Francisco CA, US
Rui M. Bastos - Porto Alegre, BR
Johnny S. Rhoades - Durham NC, US

Assignee:

NVIDIA Corp. - Santa Clara CA

International Classification:

G09G 5/02

US Classification:

345604

Abstract:

An apparatus and method for converting color data from one color space to another color space. A driver determines that a set of shader program instructions perform a color conversion function and the set of shader program instructions are replaced with either a single shader program instruction or a flag is set within an existing shader program instruction to specify that output color data is represented in a nonlinear color format. The output color data is converted to the nonlinear color format prior to being stored in a frame buffer. Nonlinear color data read from the frame buffer is converted to a linear color format prior to shading, blending, or raster operations.

US Patent:

7593432, Sep 22, 2009

Filed:

Apr 16, 2001

Appl. No.:

09/835704

Inventors:

Michael McClary - Newark CA, US
Sharath Narahari - Pleasanton CA, US
Andrew Tao - Palo Alto CA, US

Assignee:

Redback Networks Inc. - San Jose CA

International Classification:

H04J 3/04

US Classification:

370535

Abstract:

A method and apparatus for deframing signals is described. In one embodiment of the invention, a computer implemented method comprises receiving a plurality of signals at a first clock rate, synchronizing the plurality of signals to a second clock rate, and deframing the plurality of signals.

US Patent:

7616218, Nov 10, 2009

Filed:

Dec 5, 2005

Appl. No.:

11/295355

Inventors:

Vimal S. Parikh - Fremont CA, US
Andrew J. Tao - San Francisco CA, US
Lordson L. Yue - Foster City CA, US

Assignee:

NVIDIA Corporation - Santa Clara CA

International Classification:

G09G 5/00

US Classification:

345620, 345619, 345622

Abstract:

Apparatus, system, and method for clipping graphics primitives are described. In one embodiment, a clipping module includes a clipping engine and a clipping controller connected to the clipping engine. The clipping controller is configured to determine which edges of an input graphics primitive intersect a first clipping plane. The clipping controller is configured to direct the clipping engine to clip, with respect to the first clipping plane, a first pair of edges of the input graphics primitive in response to determining that the first pair of edges intersect the first clipping plane.