公开(公告)号：JP2002351822A

公开(公告)日：2002-12-06

申请号：JP2002074576

申请日：2002-03-18

Applicant: IBM

Inventor： BROCK BISHOP ,  CARPENTER GARY

IPC: G06F13/362 ,  G06F13/36 ,  G06F13/364 ,  H04L12/403

Abstract: PROBLEM TO BE SOLVED: To effectively isolate desired bus agent from the bus by selectively modifying bus signals. SOLUTION: The selective modification of bus signals may be determined from a stored table (permission table) indicating a prohibited bus transaction initiator/destination pair and a permitted bus transaction initiator/destination pair. The permission table may be used to provide a unique 1-bit signal to each bus agent indicating whether the corresponding bus agent is permitted to receive transactions from the current bus master. The permission bit may be routed to external gating circuitry associated with each bus agent. The gating circuitry may receive one or more bus control signals and may modify the control signals depending upon the state of permission bit.