Systeme und Verfahren zum Codeschutz in nichtflüchtigen Speichersystemen

Details

Veröffentlichungs-Nr.

EP2709034

Aktenzeichen

EP13183411

Anmeldetag

6. September 2013

Veröffentlichung

21. November 2018

Erteilung

21. November 2018

Rechtsraum

EP

IPC

G06F12/14G06F21/62G06F21/79

Abstract

Methods and systems are disclosed for code protection in non-volatile memory (NVM) systems (200). Information stored within NVM memory sectors (114), such as boot code or other code blocks, is protected using lockout codes (202) and lockout keys (204) written in program-once memory areas (120) within the NVM systems (200). Further, lockout codes (202) can be combined into a merged lockout code that can be stored in a merged protection register (210). The merged protection register (210) is used to control write access to protected memory sectors (114). Lockout code/key pairs (202/204) are written to the program-once area (120) when a memory sector is protected. The program-once area (120), which stores the lockout code/key pairs (202/204), is not readable by external users. Once protected, a memory sector cannot be updated without the lockout code/key pair.

Anmelder

Firmen

NXP USA, Inc.
Freescale Semiconductor, Inc.

Land

🇺🇸 USA

Fachgebiete