公开(公告)号：EP1499976A4

公开(公告)日：2008-01-23

申请号：EP03724073

申请日：2003-04-16

Applicant: IBM

Inventor： EVANS EDWARD K ,  FOSTER ERIC M ,  FRANKLIN DENNIS E ,  HALL WILLIAM E

IPC: G06F21/24 ,  G06F12/14 ,  G06F13/36 ,  G06F21/00 ,  G06F11/30 ,  H04L9/32

CPC classification number: G06F21/6218 ,  G06F12/1483 ,  G06F21/78 ,  G06F21/85 ,  G06F2221/2129 ,  G06F2221/2141 ,  G06F2221/2143

Abstract: An access control function (440) for an integrated system (400) is provided which determines data access based on the master id of a requesting master (410) within the system (400) and the address of the data. The access control function (440) can be inserted, for example, into the data transfer path between bus control logic (430) and one or more slaves (420). In addition to determining whether to grant access to the data, the access control function (440) can further qualify the access by selectively implementing encryption and decryption (470) of data, again dependent on the data authorization level for the particular functional master (410) initiating the request for data.

公开(公告)号：CA1231456A

公开(公告)日：1988-01-12

申请号：CA488364

申请日：1985-08-08

Applicant: IBM

Inventor： ARLINGTON DAVID L ,  CHEN CHIN-LONG ,  EVANS EDWARD K

IPC: G06F11/10 ,  G06F12/16 ,  G11C11/401 ,  G11C29/00 ,  G11C29/42 ,  H03M13/00 ,  H03M13/03 ,  H03M13/19 ,  G06F11/00

Abstract: EXTENDED ERROR CORRECTION FOR PACKAGE ERROR CORRECTION CODES An extended error code particularly applicable to a code that can correct any number of errors in one sub-field but can only detect the existence of any number of errors in two sub-fields. If the initial pass of the data through the error correction code indicates an uncorrected error, the data is complemented and restored in the memory and then reread. The retrieved data is recomplemented and again passed through the error correction code. If an uncorrected error persists, then a bit-by-bit comparision is performed between the originally read data and the retrieved complemented data to isolate the hard fails in the memory. The bits in the sub-field associated with the hard fail are then sequentially changed and then the changed data word is passed through the error correction code. A wrong combination is detected by the error correction code. The sequential changing continues until the bits in the sub-field associated with the hard fail match the originally stored data, in which case the error correction code can correct the remaining errors in the remaining sub-fields.

公开(公告)号：DE3684788D1

公开(公告)日：1992-05-21

申请号：DE3684788

申请日：1986-01-02

Applicant: IBM

Inventor： ARLINGTON DAVID L ,  CHEN CHIN-LONG ,  EVANS EDWARD K

IPC: G06F11/10 ,  G06F12/16 ,  G11C11/401 ,  G11C29/00 ,  G11C29/42 ,  H03M13/00 ,  H03M13/03 ,  H03M13/19

Abstract: An extended error correction code operation particularly applicable to a code that can correct any number of errors in one sub-field or package but can only detect the existence of any number of errors in two sub-fields of a code word. If the initial pass of the data through the error correction code (ECC) logic (12) indicates an uncorrected error, the data is complemented and restored in the memory (10) and then reread. The retrieved data is recomplemented and again passed through the ECC logic (12). If an uncorrected error persists, then a bit-by-bit comparison (34) is performed between the originally read data (32) and the retrieved complemented data (30) to isolate the hard fails in the memory. The bits in the sub-field associated with the hard fail are then sequentially changed (20, 36, 38) and then the changed data word is passed through the ECC logic. A wrong combination is detected by the error correction code. The sequential changing continues until the bits in the sub-field associated with the hard fail match the originally stored data, in which case the error correction code logic can correct the remaining errors in the remaining sub-fields.

公开(公告)号：AU2003230960A1

公开(公告)日：2003-11-03

申请号：AU2003230960

申请日：2003-04-16

Applicant: IBM

Inventor： EVANS EDWARD K ,  FOSTER ERIC M ,  FRANKLIN DENNIS E ,  HALL WILLIAM E

IPC: G06F21/24 ,  G06F12/14 ,  G06F13/36 ,  G06F21/00 ,  G06F11/30 ,  H04L9/32

Abstract: An access control function for an integrated system is provided which determines data access based on the master id of a requesting master within the system and the address of the data. The access control function can be inserted, for example, into the data transfer path between bus control logic and one or more slaves. In addition to determining whether to grant access to the data, the access control function can further qualify the access by selectively implementing encryption and decryption of data, again dependent on the data authorization level for the particular functional master initiating the request for data.