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EP0482336A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Switchable transceiver interface device

Assignee: National Semiconductor Corp
•
Filing: 1991-09-12
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Granted: —
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Expires: 2011-09-12
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Abstract

Abstract A transceiver interface device in accordance with the present-invention includes features which allow the transceiver to be switched for operation in either a differential or a single-ended mode. First, the output levels of the transceiver's differential line driver are switchable between TTL levels and non-TTL levels with small differential swings. Second, the transceiver's differential receiver is switchable between a differential threshold and a single-ended TTL threshold. Third, while in differential mode, both outputs of the driver may be placed in the high impedance state or active at the same time, but it is also possible to switch to a single-ended mode in which one driver output is in the high impedance state while the other can be switched between being active or being in the high impedance state. Fourth, the transceiver uses the SCSI standard DIFFSENS pin or driver enable signal for switching between differential mode and single-ended mode operation.

Inventors

  • 👤 Gary S. Murdock

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 19:23
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/0175; H03K19/0185; H03K19/018592; G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4063; G06F13/4068; G06F13/4072; H03K19/018585

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 106 words
A switchable transceiver interface device connectable between a data system and a transmission medium for transferring data signals therebetween, the switchable transceiver interface device comprising: (a) a receiver for transferring input data signals received from the transmission medium to the data system via an input/output node of the transceiver interface device; and (b) a driver for transferring output data signals received from the data system via the input/output node to the transmission medium, the driver responsive to first and second logic states of a mode control input signal to the driver for switching differential outputs of the driver between first and second output voltage levels, respectively.
Claim 2
Dependent Claim 29 words
A switchable transceiver interface device as in Claim 1 wherein the first output voltage levels are TTL voltage levels and the second output voltage levels are non-TTL voltage levels.
Claim 3
Dependent Claim 111 words
A switchable transceiver interface device connectable between a data system and a transmission medium for transferring data signals therebetween, the switchable transceiver interface device comprising: (a) a driver having differential outputs for transferring output data signals received from the data system via an input/output node of the transceiver interface device to the transmission medium; and (b) a differential receiver for transferring input data signals received from the transmission medium to the data system via the input/output node, the receiver responsive to first and second logic states of a mode control input signal to the receiver for switching the receiver threshold between a differential receiver threshold and a single-ended receiver threshold, respectively.
Claim 4
Dependent Claim 19 words
A switchable transceiver interface device as in Claim 3 wherein the single-ended receiver threshold is a TTL single-ended threshold.
Claim 5
Dependent Claim 146 words
A switchable transceiver interface device as in Claim 3 wherein (a) when the mode control input signal is in the first logic state, the driver responds to a first logic state of a driver enable signal to the driver by maintaining both driver differential outputs active and to a second logic state of the driver enable input signal by placing in the high impedance state both driver differential outputs in a high impedance state; and (b) when the mode control input signal is in the second logic state, the driver responds to the first logic state of the driver enable input signal by maintaining both driver differential outputs in the high impedance state and to the second logic state of the driver enable input signal by placing one of the driver differential outputs in the high impedance state while maintaining the other driver differential output active.
Claim 6
Dependent Claim 32 words
A switchable transceiver interface device as in Claim 1, 2, 3, 4 or 5 wherein the mode control input signal is provided by the SCSI standard DIFFSENS pin or driver enable signal.

References Cited (Backward Citations)

US3333113A Cited

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