公开(公告)号：JP2000250883A

公开(公告)日：2000-09-14

申请号：JP2000045925

申请日：2000-02-23

Applicant: IBM

Inventor： JOHN PATON BANNISTER ,  CARPENTER GARY DALE ,  MARK EDWARD DEAN ,  DAVID BRIAN GRASCO ,  RICHARD NICHOLAS IACHETTA JR

IPC: G06F12/08 ,  G06F15/177

Abstract: PROBLEM TO BE SOLVED: To avoid the loss of data and coherence by respectively providing first and second nodes with a local mutual connection, a system memory coupled with the local mutual connection and a node controller located between the local mutual connections. SOLUTION: A READ request in a home node 10a is transferred to a remote node 10b where corrected data are resident. Concerning the READ request, the boat of correction/intervention is received by the remote node 10b. The remote node 10b returns the corrected/intervened boat and the corrected data to the home node 10a. A node controller 20 generates a new tag and issue the write back kill (WBC request) of R bit = 1. A coherence mechanism in the node controller 20 completes the WBC request like ReRum of locally generated WBC requests. In this case, data in a local memory 18 are made effective.