Abstract:
An anti-collision method to identify and select contactless electronic modules (MDL) by a terminal is provided. A module may generate a random identification number prior to a communication, and respond to a general or complementary identification request on a time slot that varies according to its identification number. A non-selected module may generate a new random identification number when it receives a complementary identification request. Thus, the time slot of a non-selected module provided in response to a complementary identification request is not statistically the same as its time slot in response to a previous identification request, and it varies according to its identification number (ID).
Abstract:
The leadframe has a perforation to form, between a central platform and a peripheral part located a certain distance apart, radiating elongate leads. The leadframe has, on its rear face that comes into contact with a bearing surface of a mold, at least one recess and a groove for connecting this recess to the perforation.
Abstract:
A method for interlacing digital data to reduce transmission errors includes dividing a stream of digital data into consecutive blocks of bits, and interlacing each block of bits by writing to an interlacing table. The interlacing table is arranged in the form of rows and columns of memory addresses, with a number of the rows and columns corresponding to predetermined interlacing parameters. The access sequences to the memory addresses for interlacing the blocks of bits are different from each other. The method further includes reading a block of bits in the interlacing table according to a memory addresses access sequence, and also writing bits to a consecutive block of bits according to the memory addresses access sequence during the reading.
Abstract:
An electrically erasable and programmable memory includes an array of memory cells, and a distribution line linked to a receiving terminal of an external supply voltage and to a booster circuit. The distribution line provides an internal supply voltage. The distribution line is also linked to the receiving terminal through a diode or a diode circuit simulating operation of a diode. The memory includes a regulator for triggering the booster circuit when the internal supply voltage becomes lower than a threshold so as to maintain the internal supply voltage close to the threshold when the external supply voltage is too low, at least during the reading of memory cells. The diode or the diode circuit is blocked when the external supply voltage is too low.
Abstract:
A method for scrambling current consumption of an integrated circuit, at least during execution of a confidential operation by the integrated circuit that includes reading confidential data stored therein and/or the calculation of an encryption code is provided. The charge pump is activated to generate current consumption fluctuations on the electrical power supply line of the integrated circuit, at an intensity great enough to mask the current consumption variations associated with the execution of the confidential operation.
Abstract:
A method of programming a row of antifuse memory cells includes breaking down at least N antifuse elements in the memory cells. The breakdown includes the application of a breakdown voltage to the anode of each antifuse element. The antifuse elements are broken down sequentially by groups of P antifuse elements, with P being less than N and at least equal to 1. The antifuse elements of a same group simultaneously receive the breakdown voltage. The breakdown of a next group of antifuse elements immediately takes place after the breakdown of a previous group of antifuse elements.
Abstract:
A method and apparatus for the programming and erasure of a memory cell made out of floating-gate transistors and to the circuit pertaining thereto is described. It can be applied especially to non-volatile electrically erasable and programmable memories, for example EEPROMs and flash EPROMs. A programming voltage or erasure voltage including a voltage shift equal in value to a reference voltage is produced, followed by a voltage ramp comprising a rising phase followed possibly by voltage plateau, this voltage ramp being shifted in voltage by the value of the reference voltage and being followed, in turn, by a voltage drop. The value of the voltage shift is fixed at an intermediate value that is lower than the value of a so-called tunnel voltage of the memory cell but greater than the supply voltage.
Abstract:
1,131,920. Coating. P.P.G. INDUSTRIES, Inc. 5 July, 1966, No. 30114/66. Headings B2E and B2K. [Also in Division C3] Compositions suitable for providing heatcurable coatings on substrates such as glass, wood, hardboard, plastics and metals, e.g. steel, treated steel or aluminium, comprise a solvent and, as essential film-forming component, an interpolymer of (a) 2-25 mole per cent of a hydroxyalkyl ester of an ethylenically unsaturated carboxylic acid (b) 0.1-20 mole per cent of an ethylenically unsaturated carboxylic acid and (c) at least one ethylenically unsaturated comonomer, the composition containing at least 0.1 per cent by weight, based on the weight of the interpolymer, of polymerised carboxylic acid units which have been reacted with an alkylenimine or substituted alkylenimine. In a modification, the iminated carboxylic acid units are present in a separate polymer which is blended with the hydroxyalkyl ester interpolymer. The composition may include an additional resinous component which is coreactive with the interpolymer to form cross-links. Such resins include aminealdehyde products which may be etherified, alkyd resins, polyepoxides, epoxy esters, vinyl halide polymers, cellulosic polymers, polysiloxanes and phenolic resins. A pigment, e.g. carbon black or phthalocyanine blue, may be included; other additives include acrylic polymers, p-phenylene diamine, mono- or di-nbutyl phosphate, additional solvents, plasticisers and fillers. The coatings are preferably applied by spraying and can be cured by baking at 150-300‹F for 10-40 minutes.