David Edgar Castle

Title: David Edgar Castle: Innovator in Data Processing Systems

Introduction

David Edgar Castle is a notable inventor based in Poway, California. He holds five patents that showcase his contributions to the field of data processing systems. His innovative work has significantly impacted technology, particularly in the areas of cache memory and pulse synchronization.

Latest Patents

One of Castle's latest patents is a multi-bus data processing system. This system features high-level cache memories that can store data words in one of four states: shared, modified, invalid, or exclusive. Additionally, low-level cache memories store data words in one of three states: shared, modified, or invalid. The system is designed to enhance data processing efficiency by utilizing a main memory coupled to a system bus and multiple processor buses.

Another significant patent is the pulse synchronizing module. This module includes input leads for a clock signal and asynchronous digital input pulses. It features two counter circuits that are triggered by rising and falling edge transitions in the input pulses. The output circuit generates synchronized output pulses based on the counts sampled in the registers, ensuring that the number of output pulses matches the number of input pulses, even in the presence of errors.

Career Highlights

David Edgar Castle is currently employed at Unisys Corporation, where he continues to develop innovative technologies. His work has been instrumental in advancing data processing systems, making them more efficient and reliable.

Collaborations

Castle has collaborated with notable colleagues, including Laurence P Flora and Manoj Gujral. These partnerships have contributed to the successful development of his patents and innovations.

Conclusion

David Edgar Castle is a distinguished inventor whose work in data processing systems has made a lasting impact on technology. His patents reflect his commitment to innovation and excellence in the field.