公开(公告)号：JP2000082036A

公开(公告)日：2000-03-21

申请号：JP14111099

申请日：1999-05-21

Applicant: IBM

Inventor： ALEXANDER EDWARD OKUPISHU ,  THOMAS ALBERT PETERSON

IPC: G06F13/16 ,  G06F13/14 ,  G06F13/376 ,  G06F13/42

Abstract: PROBLEM TO BE SOLVED: To provide a means which eliminates the retrial of an operation during the collision of immediately preceding adjacent address coincidence (PAAM) windows by preparing a step where a system bus is snooped, a step where it's decided whether a 1st operation collides with its immediately preceding operation and a step where a null transaction type is inserted. SOLUTION: The communication is performed among the processors A 104, B 106 and C 108 of a data processing system 100 and a system memory 110 via a system bus 102. This method eliminates the collision of addresses on the bus 102 and includes a step where the bus 102 is snooped, a step where it's decided whether a 1st operation collides with its immediately preceding operation and a step where a null transaction type is inserted. If the PAAM windows of the same addresses are detected, a non-master processor switches the issued next transaction type to a null type.