Browse Prior Art Database

High Performance Protocol to Grant a Data Bus Without Data Buffer Reservations on the Receiving End that Avoids Data Buffer Overflow and System Deadlocks

IP.com Disclosure Number: IPCOM000014100D
Original Publication Date: 2000-Mar-01
Included in the Prior Art Database: 2003-Jun-19

Publishing Venue

IBM

Abstract

High Performance Protocol to Grant a Data Bus Without Data Buffer Reservations on the Receiving End that Avoids Data Buffer Overflow and System Deadlocks Disclosed is a method for arbitrating a data bus with limited data buffer space using sideband full and nearly full signals from the data buffer control logic. These signals are used instead of counters that keep track of the number of buffers remaining. This frees the arbiter from having to be updated anytime the size of the data buffers changes. Additionally disclosed is a mechanism for avoiding deadlocks when only one data buffer remains for an indefinite period of time by retrying the address portion of an address/data transfer.