公开(公告)号：DE602005014980D1

公开(公告)日：2009-07-30

申请号：DE602005014980

申请日：2005-04-04

Applicant: IBM

Inventor： YOSIM PAUL STEWART ,  RASHID IRFAN

IPC: G06F1/00 ,  G06F21/00

Abstract: Methods and apparatus that allow restricted access to internal registers of an integrated circuit (IC) device via an interface are provided. Unrestricted access to internal registers via the interface may be allowed during a manufacturing process to allow device testing. After such testing is complete, the device may be placed in a restricted access mode, for example, by blowing a master "lock" fuse, to prevent unrestricted access to one or more of the internal registers via the interface. However, full or partial access to the internal registers may still be provided via an access code or "combination lock" allowing the master fuse lock, in effect, to be bypassed.

公开(公告)号：AT434228T

公开(公告)日：2009-07-15

申请号：AT05717167

申请日：2005-04-04

Applicant: IBM

Inventor： YOSIM PAUL ,  RASHID IRFAN

IPC: G06F21/02 ,  G06F21/00

Abstract: Methods and apparatus that allow restricted access to internal registers of an integrated circuit (IC) device via an interface are provided. Unrestricted access to internal registers via the interface may be allowed during a manufacturing process to allow device testing. After such testing is complete, the device may be placed in a restricted access mode, for example, by blowing a master "lock" fuse, to prevent unrestricted access to one or more of the internal registers via the interface. However, full or partial access to the internal registers may still be provided via an access code or "combination lock" allowing the master fuse lock, in effect, to be bypassed.