公开(公告)号：MY122111A

公开(公告)日：2006-03-31

申请号：MYPI9803080

申请日：1998-07-07

Applicant: IBM

Inventor： BEUKEMA BRUCE LEROY ,  BUCKLAND PATRICK ALLEN ,  CHEN WEN-TZER THOMAS ,  ELKO DAVID ARLEN ,  JUDD IAN DAVID ,  RECIO RENATO JOHN

IPC: G06F13/28 ,  G06F3/00 ,  G06F9/06 ,  G06F12/08

Abstract: THE SYSTEM I/O INTERFACE (24) AND ITS DATA STRUCTURE (26) ARE DESIGNED TO MINIMIZE THE HOST CPU UTILIZATION IN DRIVING AN ADAPTER (18, 20). THE INTERFACE IS ALSO DESIGNED TO REDUCE THE SYSTEM INTERFERENCE IN PROCESSING I/O REQUESTS. TO ELIMINATE THE NEED OF USING PIO INSTRUCTIONS, THE COMMAND/STATUS BLOCKS FOR EXCHANGING MESSAGES BETWEEN THE SYSTEM (10) AND THE ADAPTER RESIDE IN THE SYSTEM MEMORY (14). THE DATA STRUCTURE IS DESIGNED TO AVOID "SHARE WRITE" ENTRIES IN ORDER TO FURTHER MINIMIZE THE OVERHEAD OF MAINTAINING EACH COHERENCY WHEN UPDATING AN ENTRY IN THE CACHE EITHER CONCURRENTLY OR SEQUENTIALLY BY BOTH ADAPTER AND SYSTEM CPU (12). FURTHER, THE DATA STRUCTURE OF THE CONTROL AND STATUS BLOCKS IS RESIDED IN THE SYSTEM MEMORY. THE SYSTEM CPU USES STORE INSTRUCTION TO PREPARE CONTROL BLOCKS AND LOAD INSTRUCTION TO READ FROM COMPLETION STATUS BLOCKS; WHILE THE ADAPTER WILL RELY ON ITS DMA ENGINE TO MOVE DATA TO/FROM SYSTEM MEMORY IN ACCESSING CONTROL/STATUS BLOCKS.(FIG. 1)

公开(公告)号：DE602007009835D1

公开(公告)日：2010-11-25

申请号：DE602007009835

申请日：2007-05-23

Applicant: IBM

Inventor： BENDER CARL ALFRED ,  BUCKLAND PATRICK ALLEN ,  THURBER STEVEN MARK ,  YANES ADALBERTO GUILLERMO

IPC: G06F12/02 ,  G06F13/28

公开(公告)号：BR8600666A

公开(公告)日：1986-11-04

申请号：BR8600666

申请日：1986-02-17

Applicant: IBM

Inventor： BUCKLAND PATRICK ALLEN ,  IRWIN JOHN WILLIAM

IPC: G06F3/153 ,  G09G5/22 ,  G06F13/24

公开(公告)号：SG44451A1

公开(公告)日：1997-12-19

申请号：SG1996000502

申请日：1991-02-19

Applicant: IBM

Inventor： JUDD IAN DAVID ,  BUCKLAND PATRICK ALLEN ,  CATH ROGER GOODWIN ,  COCKBURN GORDON JOHN ,  SHORT WILLIAM ANTHONY

IPC: G06F3/06 ,  G06F13/28