Flag signal generation circuit and semiconductor device...

Details Flag signal generation circuit and semiconductor device... Flag signal generation circuit and semiconductor device...

2010-07-27

2011-11-15

Luu, An (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Clock or pulse waveform generating

C327S298000, C327S512000, C365S211000

Reexamination Certificate

active

08058920

ABSTRACT:
A flag signal generation circuit includes a first periodic signal detection unit, a second periodic signal detection unit, and a flag signal output unit. The first periodic signal detection unit is configured to detect a change in a level of a first periodic signal and generate a first detection signal. The second periodic signal detection unit is configured to detect a change in a level of a second periodic signal and generate a second detection signal. The flag signal output unit is configured to generate a pre-flag signal from the first and second detection signals, buffer the pre-flag signal in response to a mode register read signal, and output the buffered pre-flag signal as a flag signal.

REFERENCES:
patent: 7369451 (2008-05-01), Oh
patent: 7560978 (2009-07-01), Byeon et al.
patent: 7911868 (2011-03-01), Lee
patent: 2010/0142304 (2010-06-01), Pyeon
patent: 100854463 (2008-08-01), None

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