US 5,510,775 AGranted

Method of personalizing an electronic module and electronic circuit and module for implementing the method

AssigneeSiemens Aktiengesellschaft

InventorJean-Pierre Loncle

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Abstract

The method applies to an electronic module comprising a gateway to a communication bus suitable for receiving digital signal frames comprising, in particular, a frame-identifier field and a data field, an identifier discriminator being provided in the module in order to authorize the acquisition by the latter of the data contained in frames comprising a predetermined identifier, this discriminator comprising a memory zone assigned to the latter. A signal frame, the data field of which contains the predetermined identifier, and the identifier field of which contains an image of the initial state of the memory zone, is initially applied to the gateway of the module to the communication bus, in such a way that the identity then established by the discriminator between the initial content of this zone and the identifier field of the frame, authorizes the loading into the said memory zone of the predetermined identifier inscribed in the data field of the frame. Application to an assembly of interconnected electronic modules in a multiplex communications network placed on board an automotive vehicle.

Method of personalizing at least one of a plurality of electronic modules connected to a communication bus through a gateway, and adapted for receiving digital signal frames, each frame having at least a frame identifier field and a data field, each one of said modules including an identifier discriminator having a memory zone containing at least an identifier identifying the module, said discriminator being adapted to authorize acquisition by the module of the data contained in frames having said identifier in the frame identifier field,

wherein the initial content of said memory zone is initially identical for all modules, said method comprising the steps of:
(a) applying initially via the bus gateway a digital signal frame having a frame identifier field corresponding to an image of said initial content of said memory zone and a data field including a predetermined identifier;
(b) determining by means of the discriminator equality between said initial content of said memory zone and the frame identifier field of the digital signal frame;
and
(c) authorizing, when equality has been established, the loading into said memory zone of the predetermined identifier stored in the data field of the frame,
wherein the digital signal frames transmitted by the communication bus further include n predetermined bits capable of forming 2.sup.n possible combinations of logic states of which at least a selected one is not used in normal service, said method further comprising the steps of:
(d) comparing the logic state of said n bits present in said digital frame with said at least one selected unused combination, and
(e) authorizing loading the predetermined identifier into the memory zone only when the compared combinations are equal, and
wherein said digital signal frame has a read/write bit representing a request for respectively reading or writing data, and a RTR bit representing a request for remote transmission and,
wherein said unused combination is formed by setting the read/write bit in write position and the RTR bit in remote transmission requesting position.

7 more elements

Abstract

Claims7