Semiconductor device with high security having JTAG ports

Details Semiconductor device with high security having JTAG ports Semiconductor device with high security having JTAG ports

2007-12-26

2011-10-18

Pich, Ponnoreay (Department: 2435)

Information security

Access control or authentication

Stand-alone

C726S016000, C726S019000, C713S183000

Reexamination Certificate

active

08042173

ABSTRACT:
A semiconductor device includes JTAG ports receiving integrally command information representing a command and password information representing a password, a processor for performing a process in response to the command, an output port outputting consequence information representing a consequence of the process, a transfer section for transferring the command to the processor and for transferring the consequence information to the output port, and a cut off section. The cutoff section cuts off at least one of transferring the command information to the processor and transferring the consequence information to the output port when the password does not match a predetermined proper password. Thus, the semiconductor device can advantageously heighten its security effect.

REFERENCES:
patent: 5226080 (1993-07-01), Cole et al.
patent: 5606615 (1997-02-01), Lapointe et al.
patent: 5719941 (1998-02-01), Swift et al.
patent: 6523099 (2003-02-01), Namekawa
patent: 6996721 (2006-02-01), Gentile
patent: 7509250 (2009-03-01), Cruzado et al.
patent: 2003/0023871 (2003-01-01), Gnanasabapathy et al.
patent: 2003/0101354 (2003-05-01), Okabe et al.
patent: 2006/0288230 (2006-12-01), Crall et al.
patent: 2002-032267 (2002-01-01), None
patent: 2002-183108 (2002-06-01), None

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