Mask programmable security system for a data processor and metho

Details Mask programmable security system for a data processor and metho Mask programmable security system for a data processor and metho

1996-04-15

1997-12-30

Beausoliel, Jr., Robert W.

Cryptography

Key management

Having particular key generator

380 4, 3642467, 3649691, G06F 1100

Patent

active

057040397

ABSTRACT:
A data processing system (10) allows an authorized user to unlock a security mode by providing a code stored in a plurality of mask registers (60,62,66) such that the system is selectively allowed to communicate with an external device. When an reset signal is received, a selector (48) selects a first mask register (60) and retrieves a first stored address value and a first stored data value therefrom. The first stored address and data values are respectively compared with a first address value and a first data value by a comparator (44). This process of selecting and comparing continues until a final match signal is asserted. When the final match signal is asserted, a secure signal is negated and the system may communicate with the external user.

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