Combination multiplexer and tristate driver circuit
AssigneeBroadcom Corporation
InventorDaniel W. Dobberpuhl
Life of this patent
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Abstract
A combination multiplexer and tristate circuit. A multiplexer circuit may be configured to receive at least a first data input and a second data input, which are selected by at least a first select signal and a second select signal, respectively. A first circuit is configured to provide an output to an output node responsive to the data input that is selected by the corresponding select signal being active. The multiplexer circuit may further use a tristate circuit, which is also coupled to receive the first select signal and the second select signal. If neither the first select signal nor the second select signal are active, then the tristate circuit is configured to prevent the first circuit from providing an output to the output node.
Claims17
A multiplexer circuit comprising:
- a first circuit coupled to receive at least a first data input and a second data input and at least a first select signal and a second select signal corresponding to said first data input and said second data input, wherein said first circuit is coupled to an output node and is configured to provide an output on said output node responsive to a corresponding one of said first select signal or said second select signal being active;
- a tristate circuit coupled to receive said first and said second select signals and coupled to said first circuit, wherein said tristate circuit is configured to prevent said first circuit from providing said output on said output node responsive to said first select signal and said second select being inactive.
A multiplexer circuit comprising:
- a first multiplexer circuit, wherein said first multiplexer circuit is coupled to a first data input and a second data input and a first select signal and a second select signal corresponding to said first data input and said second data input, respectively, wherein said first multiplexer circuit is configured to provide an output on an output node responsive to a corresponding one of said first select signal or said second select signal being active and to provide no output on said output node responsive to said first select signal and said second select signal being inactive;
- a second multiplexer circuit, wherein said second multiplexer circuit is coupled to a third data input and a fourth data input and a third select signal and a fourth select signal corresponding to said third data input and said fourth data input, wherein said second multiplexer circuit is configured to provide an output on said output node responsive to a corresponding one of said third or said fourth select signals being active and to provide no output on said output node responsive to said third select signal and said fourth select signal being inactive.
A method of operating a multiplexer circuit, said method comprising:
- receiving at least a first data input and a second data input;
- receiving at least a first select signal corresponding to said first data input and a second select signal corresponding to said second data input;
- providing an output on an output node responsive to a corresponding one of said first select signal or said second select signal being active;
- providing no output on said output node responsive to said first select signal and said second select signal being inactive.
A multiplexer circuit comprising a plurality of N input multiplexer circuits, wherein each one of said plurality of N input multiplexer circuits is coupled to an output node and to N select signals, wherein each one of said plurality of N input multiplexer circuits is configured to provide an output on said output node responsive to one of said N select signals being active, wherein each one of said plurality of N input multiplexer circuits is configured to provide no output on said output node responsive to N select signals being inactive.
Dependencies are inferred from the claim text.