Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1994-08-02
1995-08-15
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327 34, 327160, 327198, H03K 1722
Patent
active
054423104
ABSTRACT:
A reset discrimination circuit for identifying the completion of power-up via a valid deassertion of an external reset signal is described. When power-up is complete the reset discrimination circuit brings a function enable signal active, which initially powered up in the inactive state. The reset discrimination circuit includes a synchronous edge detector, a high counter, and a low counter. The synchronous edge detector detects the active state of the external reset signal and generates a first reset signal, which resets the high counter. After counting M clock pulses during the active state of the external reset signal the first counter enables the low counter. The low counter counts N clock pulses during the inactive state of the external reset signal to identify its valid deassertion. A method of identifying the completion of power-up by identifying the valid deassertion of an external reset signal is also described.
REFERENCES:
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patent: 3980960 (1976-09-01), Hutchinson
patent: 4288831 (1981-09-01), Dolikian
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patent: 4900950 (1990-02-01), Dubujet
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patent: 5159217 (1992-10-01), Mortensen et al.
Callahan Timothy P.
Cunningham Terry D.
Intel Corporation
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