Method and system for multiple read/write transactions across a bridge system

US6449678B1 · kind B1 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Gary W. Batchelor · Tucson, US
• Russell Lee Ellison · Corona de Tucson, US
• Carl E. Jones · Tucson, US
• Robert E. Medlin · Tucson, US
• Belayneh Tafesse · Tucson, US
• Forrest Lee Wade · Tucson, US
• Juan Antonio Yanes · Tucson, US

Key dates

• Filing date: Mar 24, 1999
• Grant date: Sep 10, 2002
• Expiry date: Mar 24, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F13/4027
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

Disclosed is a system for processing read/write transactions from a plurality of agents over a bus. The bridge includes at least one request buffer for each agent in communication with the bridge. The request buffer for an agent buffers transactions originating from that agent. The bridge further includes a return buffer for each agent in communication with the bridge. The return buffer for an agent buffers return data in connection with a transaction. Address translation circuitry is in communication with the bus and request and return buffers. The address translation circuitry locates a request buffer to queue the transaction, such that a transaction is stored in the request buffer corresponding to the agent that originated the transaction. Further, the address translation circuitry stores read return data for a read transaction in the return buffer corresponding to the agent originating the transaction.