Enabling special modes within a digital device

Details Enabling special modes within a digital device Enabling special modes within a digital device

2006-02-16

2009-10-13

Baker, Stephen M (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital logic testing

Reexamination Certificate

active

07603601

ABSTRACT:
A special mode key match comparison module has N-storage elements and a special mode key match comparator. The N-storage elements accumulate a serial data stream, and then determine whether a digital device should operate in a normal user mode, in a public programming mode, or in a particular private test mode. To reduce the possibility of accidentally decoding a false test or programming mode, the data stream has a sufficiently large number of N-bits to substantially reduce the probability of a false decode. To further reduce the possibility of accidentally decoding a programming or test mode, the special mode key match comparison module may be reset if less or more than N-clocks are detected during the accumulation of the N-bit serial data stream. The special mode key match data patterns may represent a normal user mode, a public programming mode, and particular private manufacturer test modes.

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European Communication for 06 735 222.9 dated Nov. 21, 2008.
International Search Report for PCT/US2006/005462 Mailed Oct. 13, 2006.

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