Erroneous operation protection circuit formed between data buses

Details Erroneous operation protection circuit formed between data buses Erroneous operation protection circuit formed between data buses

1997-12-17

2000-08-01

Santamauro, Jon

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

326 21, 326 30, H03K 1716

Patent

active

060972092

ABSTRACT:
Erroneous operation protection circuits (EOPs) are provided between a plurality of precharge type data bus wirings which are set to predetermined potential beforehand and to which a plurality of circuit blocks are connected to transfer signals. Accordingly, an increase in stray capacitance of the data bus wirings can be suppressed to the lowest minimum to thus prevent erroneous operation due to coupling noises between the data bus wirings. The EOP comprises a coupling noise detector (CND) for detecting whether or not data transition on a first data bus wiring is caused by coupling noises due to capacitance between the first data bus wiring and a second data bus wiring being aligned in close vicinity to the first data bus wiring, and a precharge device for shifting potential of the first data bus wiring to return to predetermined potential if the coupling noise detector has detected the coupling noises. The EOP may also be applied to discharge type data bus wirings if a polarity and a conductivity type of semiconductor device constituting the EOP are properly reversed.

REFERENCES:
patent: 4985644 (1991-01-01), Okihara et al.
patent: 5592104 (1997-01-01), Bach

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