David W Trissel

US Patent:

53413202, Aug 23, 1994

Filed:

Mar 1, 1993

Appl. No.:

8/024011

Inventors:

David W. Trissel - Austin TX
Roderick L. Dorris - Austin TX
Stuart A. Werbner - Austin TX

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G06F 738

US Classification:

364748

Abstract:

A method for processing exception conditions in a floating-point system (40) begins by determining in hardware that an exception will occur (14) for a given floating-point operation and operand(s). After the hardware determines that an exception is to occur, an exception handler is invoked from software. The exception handler numerically alters the operands to create biased operands which may be processed by the hardware (20) via the given floating-point operation without creating another exception condition. The biased operands are then processed by the hardware via the given floating-point operation to produce a biased floating-point result. The biased floating-point result is unbiased (22) by the exception handler to achieve an unbiased result. The speed of floating-point exception handling is improved by using biasing techniques and both software and hardware to mathematically resolve floating-point exceptions to correct unbiased results.

US Patent:

60397659, Mar 21, 2000

Filed:

Dec 15, 1997

Appl. No.:

8/990780

Inventors:

David Wesley Trissel - Austin TX

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G06F 9455

US Classification:

703 26

Abstract:

Accelerating software emulation and other data processing operations utilizes execution of a single computer instruction that produces multiple data type results from a single source. The instruction generates from a single operand a plurality of different types of outputs in a corresponding plurality of registers (102-106) which are available for use as input operands to subsequently executing instructions.

US Patent:

57292230, Mar 17, 1998

Filed:

Mar 20, 1996

Appl. No.:

8/619051

Inventors:

David W. Trissel - Austin TX

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

H03M 700

US Classification:

341 51

Abstract:

An apparatus (900) for performing the steps of data compression and data expansion. Where the steps of compression of use a modulo arithmetic unit (915) for identifying matching blocks of data that are offset from each other by a multiple of N. A matching block of data is compressed by the apparatus (900) by replacing it with an escape sequence representing the size and offset of the matching block of data. The apparatus (900) identifies a least used data value for use as an escape character to identify the escape sequence. The apparatus (900) performs data expansion by identifying escape sequences and locating an expanded block of data that matches the data represented by the escape sequence by multiplying the offset represented in the escape character by N to specify the offset to the expanded block of data.

US Patent:

52748154, Dec 28, 1993

Filed:

Nov 1, 1991

Appl. No.:

7/786628

Inventors:

David W. Trissel - Austin TX
Steven R. Menyhert - Austin TX

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G06F 940

US Classification:

395700

Abstract:

A dynamic instruction modifying controller (10, 11, or 13) and controller method of operation for use with a general purpose computer. The controller has an execution device (12) and a memory (14). Residing in memory (14) is a control program (16). Control program (16) communicates to the execution device via a conductor (22). A target program (18) resides in memory (14) and communicates with the control program (16) via a conductor (24). A modifying program (20) resides in memory (14) and communicates to the control program (16) via a conductor (28). The modifying program (20) alters the target program (18) during target program (18) execution time to include the execution of a surrogate code group created by the modifying program (20).