Communication gateway for communicating data frames for a motor vehicle

A communication gateway for communicating data frames for a motor vehicle, said gateway being intended to be connected to a plurality of electronic control units in order to exchange data frames, each electronic control unit of the plurality of electronic control units being connected to said gateway via a communication bus, said gateway comprising:

• as many management modules as there are electronic control units, each management module being associated with one and only one electronic control unit;
• a memory in which the following are stored:
• a lookup table comprising an index list, with each of the indices of which is associated a memory space, in each of which may be recorded a payload of a data frame received by the gateway and at least one indicator for identifying at least one communication bus that is the recipient of said received data frame;
• an addressing table, referred to as a “level-zero” addressing table, comprising one memory region characterized by a memory address;
• an addressing table, referred to as a “level-one” addressing table, comprising eight memory regions each characterized by a memory address;
• an addressing table, referred to as a “level-two” addressing table, comprising sixty-four memory regions each characterized by a memory address,
• each memory region of each addressing table comprising a byte, each bit of a byte in a memory region being defined in the following way:
• each bit of the byte of the memory region of the level-zero addressing table is associated with a memory region of the level-one addressing table;
• each bit of each byte of a memory region of the level-one addressing table is associated with a memory region of the level-two addressing table;
• each bit of each byte of a memory region of the level-two addressing table is associated with an index of the lookup table;
• an address table of levels comprising, for each possible byte value, with the exception of the zero byte, a level-zero memory address of the level-zero addressing table, a level-one memory address of the level-one addressing table and a level-two memory address of the level-two addressing table;
• a space manager for managing spaces of the lookup table, said space manager being configured to:
• determine a free index in the lookup table on the basis of the level-zero addressing table, the level-one addressing table, the level-two addressing table and the address table;
• when a memory space of the lookup table is freed or is filled, modify the byte stored in each memory region of each addressing table associated with the index of the freed or newly filled memory space, for each level zero, one and two, so as to indicate that said memory space is free or occupied, respectively.