Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1992-10-13
1995-06-27
Lee, Thomas C.
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 82, 364DIG2, 3649261, 3649263, 3649266, 36492792, 36492795, 395250, G06F 1300, H03K 1716
Patent
active
054288002
ABSTRACT:
A bi-directional buffer includes first and second unidirectional buffers connected for retransmitting signals in opposite directions between first and second buses. When an external bus driver pulls the first bus low, the first unidirectional buffer pulls the second bus low and generates a signal inhibiting the second unidirectional buffer from actively driving the first bus. When the external bus driver allows the first bus to return to the high logic level, the first unidirectional buffer temporarily supplies a high charging current to the second bus to quickly pull it up. Similarly, when an external bus driver pulls the second bus low, the second unidirectional buffer pulls the first bus low and generates a signal inhibiting the first unidirectional buffer from actively driving the second bus. When the external bus driver allows the second bus to return to the high logic level, the second buffer temporarily supplies a high charging current to the first bus to quickly pull it up. The bi-directional buffer includes a register for storing and reading out data representing successive logic states of a signal on the first bus, thereby providing a history of data appearing on the bus.
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Horng Chi-Song
Hsieh Wen-Jai
Jenq Yih-Chyun
Lofstrom Keith
Barry Lance Leonard
I-Cube, Inc.
Lee Thomas C.
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