Cross point switch
OwnerRobert P. Masleid, Scott Pitkethlyinventors
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Abstract
A cross point switch, in accordance with one embodiment of the present invention, includes a plurality of tri-state repeaters coupled to form a plurality of multiplexers. Each set of corresponding tri-state repeaters in the plurality of multiplexers share a front end module such that delay through the cross point switch due to input capacitance is reduced as compared to conventional cross point switches.
Claims21
A cross point switch comprising:
- a plurality of multiplexers, individual of the multiplexers including a a plurality of tri-state repeaters, wherein individual of the tri-state repeaters is configured to operate four output states responsive to a select signal in a first enable state and to operate in a moderate or high impedance state responsive to select signal in a second enable state, and wherein the four output states comprises a hard first drive state, a weak first drive state, a hard second drive state, and a weak second drive state.
An apparatus comprising a cross point switch including a plurality of tri-state repeaters, wherein an output of individual of the tri-state repeaters operates in a first hard drive state for a period of time and then a first weak drive state in response to a transition from a first input state to a second input state of an input signal, and a second hard drive state for a period of time and then a second weak drive state in response to a transition from the second input state to the first input state of the input signal when a select signal is in a first enable state and in a high impedance state when the select signal is in a second enable state.
A cross point switch comprising:
- a means for operating in four states as a function of an input state when a select input is in a first state, wherein the four states include a hard first drive state, a weak first drive state, a hard second drive state, and a weak second drive state;
- and
- a means for operating in an impedance output state when the select input is in a second state.
A repeater comprising:
- an up-drive module configured to generate a hard first drive state;
- a down-drive module configured to generate a hard second drive state;
- a keeper module configured to generate a weak first drive state and a weak second drive state;
- and
- an enable module configured to place an output of the up-drive module, the down-drive module, and the keeper module in a moderate or high impedance state as a function of an enable signal.
A multiplexer comprising:
- a plurality of tri-state repeaters, individual of the tri-state repeaters having a data input coupled to an input data signal, a control input coupled to a select signal, and an output coupled to the outputs of the other tri-state repeaters;
- wherein the output of individual of the tri-state repeaters is configured to operate in four output states, the four output state including a hard first drive state, a weak first drive state, a hard second drive state, and a weak second drive state when the select signal is in a first enable state, and wherein the output of individual of the tri-state repeater is configured to operate in a moderate or high impedance state when the select signal is in a second enable state.
Dependencies are inferred from the claim text.