DAVID ARTHUR SCHROEDER
Pilots at Wexford Cir, Saint Paul, MN
License number
Minnesota A1690012
Issued Date
Oct 2016
Expiration Date
Apr 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
1605 Wexford Cir, Saint Paul, MN 55122
Professional information
System And Method For Testing Interrupt Processing Logic Within An Instruction Processor
US Patent:
6167479, Dec 26, 2000
Filed:
Aug 3, 1998
Appl. No.:
9/128297
Inventors:
Thomas D. Hartnett - Roseville MN
John S. Kuslak - Blaine MN
David R. Schroeder - Mounds View MN
John S. Kuslak - Blaine MN
David R. Schroeder - Mounds View MN
Assignee:
Unisys Corporation - Blue Bell PA
International Classification:
G06F 948
US Classification:
710260
Abstract:
A system and method is provided for selectively injecting interrupts within the instruction stream of a data processing system. The system includes a programmable storage device for storing interrupt injection signals, each of which is associated with a respective machine instruction. When execution of the associated machine instruction is initiated, the stored signal is read from the storage device and is made available to the interrupt logic within the instruction processor. If set to a predetermined logic level, the signal causes an interrupt to be injected within the instruction processor. The system provides the capability to simultaneously inject different types of interrupts, including fault and non-fault interrupts, during the execution of any instruction. The invention further provides a programmable means for injecting errors at predetermined intervals in the instruction stream. Because the current invention allows interrupt injection to be controlled by programmable logic within the instruction processor itself instead by stimulus generated and controlled by a simulation program as in prior art systems, there is no need to develop complex simulation programs to generate and control the external stimulus.