ID protected memory with a maskable ID template

Details ID protected memory with a maskable ID template ID protected memory with a maskable ID template

1988-06-28

1990-02-20

Cangialosi, Salvatore

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, 380 6, H04L 900

Patent

active

049032992

ABSTRACT:
A remotely disposed RAM (12) is provided which is accessible by a centralized serial CPU (28) through a common data link. The RAM (12l ) is interfaced with the common data link through a serial port (19) and access thereto is controlled by an arbiter (10). The arbiter (10) includes a protocol shift register (31) for receiving control information, ID information and address information for the RAM (12). The ID information is compared with prestored identification information in an ID template (37). This ID template is operable to have a portion thereof masked off in response to receiving a mask command as part of the control information. If a match is present between the unmasked portion of the ID template and the corresponding portion of the ID information, access is allowed to the arbiter (10) and the RAM (12). A response is then transmitted to the common data link in the form of data read from the RAM.

REFERENCES:
patent: 4278837 (1981-07-01), Best
patent: 4433207 (1984-02-01), Best
patent: 4465901 (1984-08-01), Best
patent: 4757533 (1988-07-01), Allen et al.
patent: 4797928 (1989-01-01), Pykes
patent: 4799153 (1989-11-01), Hann et al.

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