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| Integrated circuit I/O using a high performance bus interface |
| The present invention is designed to provide a high speed, multiplexed bus for communication ... |
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| Memory defect masking device |
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| Bidirectional line switch ring network |
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| Virtual multi-port RAM |
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| Decoding global drive/boot signals using local predecoders |
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| Semiconductor memory device having even and odd numbered bank memories |
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| Semiconductor memory device having split operation and capable of reducing power supply noise |
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Device for differential-mode information transmission between at least two elements of a motor vehicle
| Details |
Inventors: Lecoco, Jean-Luc; Magne, Pierre;
Assignee: Automobiles Peugeot (Paris, FR); Automobiles Citroen (Neuilly-sur-Seine, FR); Regie Nationale des Usines Renault (Boulogne Billancourt, FR)
Primary Examiner: Chin; Stephen
Assistant Examiner: Ghebretinsae; T.
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis
This device in which the elements are linked by two information transmission lines (2, 3) and each of which includes information sending and reception circuits (4, 5), linked to a protocol handler (6), is characterized in that the reception circuit (5) of each element (1) comprise three comparators (7, 8, 9), a first comparator (7) receiving the signals transiting on the two lines (2, 3), a second comparator (8) receiving the signals transiting on a line (2) and a third comparator (9) receiving the signals transiting on the other line (3) and, interposed between the output of these comparators (7, 8, 9) and the information input (RC) of the handler (6), a circuit (10) for selective connection of the output (R0) of the first comparator (7) or of the output of a circuit for logically combining the outputs (R1, R2) of the second and third comparators (8, 9), to the input of the protocol handler (6), under the control of the latter as a function of the state of the signals present at its input, in order to permit operation of the device in normal differential mode and in degraded mode on the basis of information transiting on one of the lines. |
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DETAILED DESCRIPTION The object of the invention is thus to resolve these problems by proposing an information transmission device which is simple, reliable and makes it possible to ensure adequate information transmission even when one of the transmission lines is disturbed and which is applicable, in particular, to a multi-master network.
To this end, the subject of the invention is a device for differential-mode information transmission between at least two elements of a motor vehicle, linked by two information transmission lines each of which comprises information sending means and information reception means, linked to a protocol handler, characterised in that the reception means of each element comprise three comparators, a first receiving as input the signals transiting on the two information transmission lines, a second receiving as input the signals transiting on an information transmission line and a third receiving as input the signals transiting on the other information transmission line and, interposed between the output of these comparators and the information input of the protocol handler, means of selective connection of the output of the first comparator or of the output of means for logically combining the outputs of the second and third comparators, to the information input of the protocol handler, under the control of the latter as a function of the state of the signals present at its information input, in order to permit operation of the device in normal differential mode and in degraded mode on the basis of information transiting on one of the transmission lines.
According to one embodiment, the selective connection means comprise a multiplexer whose output is linked to the information input of the protocol handler, whose inputs receive the output of the first comparator and the output of the means for logically combining the outputs of the second and third comparators and driven by a control output of the protocol handler.
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Fault Detection 
