Inventors:
William F. Baxter - Holliston MA
Robert G. Gelinas - Westboro MA
James M. Guyer - Northboro MA
Dan R. Huck - Shrewsbury MA
Michael F. Hunt - Ashland MA
David L. Keating - Holliston MA
Jeff S. Kimmell - Chapel Hill NC
Phil J. Roux - Holliston MA
Liz M. Truebenbach - Sudbury MA
Rob P. Valentine - Auburn MA
Pat J. Weiler - Northboro MA
Joseph Cox - Middleboro MA
Barry E. Gillott - Fairport NY
Andrea Heyda - Acton MA
Rob J. Pike - Northboro MA
Tom V. Radogna - Westboro MA
Art A. Sherman - Maynard MA
Michael Sporer - Wellesley MA
Doug J. Tucker - Northboro MA
Simon N. Yeung - Waltham MA
Assignee:
Data General Corporation - Westboro MA
International Classification:
G06F 1314
Abstract:
A very fast, memory efficient, highly expandable, highly efficient CCNUMA processing system based on a hardware architecture that minimizes system bus contention, maximizes processing forward progress by maintaining strong ordering and avoiding retries, and implements a full-map directory structure cache coherency protocol. A Cache Coherent Non-Uniform Memory Access (CCNUMA) architecture is implemented in a system comprising a plurality of integrated modules each consisting of a motherboard and two daughterboards. The daughterboards, which plug into the motherboard, each contain two Job Processors (JPs), cache memory, and input/output (I/O) capabilities. Located directly on the motherboard are additional integrated I/O capabilities in the form of two Small Computer System Interfaces (SCSI) and one Local Area Network (LAN) interface. The motherboard includes main memory, a memory controller (MC) and directory DRAMs for cache coherency. The motherboard also includes GTL backpanel interface logic, system clock generation and distribution logic, and local resources including a micro-controller for system initialization.