公开(公告)号：JPH11316713A

公开(公告)日：1999-11-16

申请号：JP36793098

申请日：1998-12-24

Applicant: ST MICROELECTRONICS SRL

Inventor： CAMPARDO GIOVANNI ,  GIANNINI GIUSEPPE ,  GHEZZI STEFANO ,  TORRICELLI PIERO ENRICO

IPC: G06F1/00 ,  G06F12/14 ,  G06F21/00 ,  G06F21/24 ,  G07F7/10 ,  G11C8/20 ,  G11C16/22

Abstract: PROBLEM TO BE SOLVED: To use a storage area of OTP (which can be program-controlled only once) and to satisfy all necessary conditions related to safety and reliability and the facility of access with respect to the constitution of a protected storage device. SOLUTION: In a method for protecting data in the semiconductor electronic storage device constituted of a storage matrix 2, respective matrix address decoding blocks 3 and a pre-decoding block, the protected storage part 5 in the matrix 2 and private decoding parts 6 and 7 are used so that a protection code CP is stored in a protected part without the address area of the matrix. The protection code CP is written and/or read only through a command translator 8.