Abstract:
PROBLEM TO BE SOLVED: To eliminate the danger that a card fails because of a contact defect between the card and the brush of a card reader. SOLUTION: This input circuit 200 for a memory integrated circuit receives a first binary signal SA transmitted by the direct contact of the card and the reader 150, performs change by first binary data A and outputs a write control signal WR for controlling a memory 140. The input circuit is provided with a control circuit 220 for inspecting the voltage level of the first binary signal SA and outputting a confirmation signal VAL and an inhibition circuit 240 for inhibiting a write command WR when the confirmation signal VAL is inactive.
Abstract:
The invention relates to a method of configuring a memory space (MEM), comprising the following steps consisting in: reading a configuration datum (SZ3) in the memory space (MEM) and dividing at least part of the memory space into memory areas (Z1-Z4) as a function of the configuration datum read; and assigning each memory area with an access number (NBK) that is used to access a datum location in the memory area, together with a logical address of the location in the memory area. The invention is suitable for RFID chips.
Abstract:
The method involves transmitting only once, a word group reading order from a start address to a tag. An address register of the tag is initialized to a value of the address to which the word is then transmitted. An incrementation HTML tag is transmitted to the tag, and the register is then incremented. A data frame with a word stored at address indicated by register`s current value is transmitted towards a remote interrogation unit. An independent claim is also included for a contactless tag.
Abstract:
L'invention concerne un procédé d'écriture par bloc dans une mémoire non volatile programmable électriquement, un bloc à écrire dans la mémoire comprenant au moins un mot. Selon l'invention, le procédé comprend des étapes de détermination d'une durée d'écriture d'un mot en divisant une durée fixée d'écriture d'un bloc par le nombre de mots du bloc à écrire, et de commande de la mémoire pour écrire successivement chaque mot (D) dans la mémoire pendant la durée d'écriture.
Abstract:
L'invention concerne un procédé pour moduler l'impédance d'un circuit d'antenne (ACT, W1, W2) fournissant des signaux de pompage (S1, S2) à une pompe de charge (PMP) comprenant au moins un premier étage de pompage (D1, D2, C1, C2) et un dernier étage de pompage (D5, D6, C5, C6), le dernier étage de pompage fournissant une tension continue (Vcc). Selon l'invention, la sortie du premier étage de pompage (D1, D2, C1, C2) est court-circuitée au moyen d'un interrupteur (SW1) et le dernier étage de pompage continue à pomper des charges électriques et fournir la tension continue (Vcc). Application notamment aux transpondeurs passifs RFID.
Abstract:
The circuit comprises a set of nodes or terminals (N1-Nn). For each node there is a corresponding set of non-modifiable circuits (MF1-MFn) for selectively applying one of two supply potentials (Vdd,Gnd), to the configuration nodes. There is also a set of modifiable circuits (MM1-MMn) for modifying the potential applied to the configuration nodes by non-modifiable circuits. The modifiable circuit (MMi) comprises a fusible (Fi), which is in an intact state before configuring, and in a breakdown state after configuring. This is connected so that Gnd potential is applied to the node in the intact state, and Vdd potential is applied to the node in the breakdown state. The two potentials are the ground or earth potential (Gnd), and the positive supply potential (Vdd). The modifiable circuit (MFi) contains several p inverters connected in series, where p is an even number, e.g. p = 2, and a junction (JCi) connecting the node to the output of the pth inverter, or to the output of the qth inverter, where q is an odd number, e.g. q = 1, which is less than p. The fusible (Fi) is connected in series with an interrupter component between terminals receiving the first potential (Gnd) and the second potential (Vdd). The common node is connected to the input of the first inverter (I1i) of the modifiable circuit (MFi). The interrupter component is a MOS transistor (MP1i), with its drain connected to the gate via an inverter (FBi). The MOS transistor (MP1i) forming an interrupter is of p-type, and its source is connected to the supply terminal. Its drain is joined to ground potential (Gnd) via the fusible (Fi). A second MOS transistor of p-type (MP2i) is connected in parallel with the MOS transistor forming an interrupter (MP1i), and receives transitionally a voltage delivered by a Power On Reset (POR) block.
Abstract:
The circuit has a memory (MEM1) containing transaction data, with electrically erasable and programmable memory cells (C i, j) arranged in horizontal and vertical lines, and linked to word lines (WL i) and bit lines (BL j). A control unit (CTU) executes commands for reading or writing in the memory. The CTU is blocked when reference memory cells of one of the groups contain bits of equal value and if the value is different from a value expected for the one of the groups. The CTU controls a voltage generator (VGEN) which supplies a read voltage (Vread) and an erase-programming voltage (Vpp). An independent claim is also included for a method for protecting an integrated circuit against a global data erasure.
Abstract:
The circuit has a memory (MEM1) containing transaction data, with electrically erasable and programmable memory cells (C i, j) arranged in horizontal and vertical lines, and linked to word lines (WL i) and bit lines (BL j). A control unit (CTU) executes commands for reading or writing in the memory. The CTU is blocked when reference memory cells of one of the groups contain bits of equal value and if the value is different from a value expected for the one of the groups. The CTU controls a voltage generator (VGEN) which supplies a read voltage (Vread) and an erase-programming voltage (Vpp). An independent claim is also included for a method for protecting an integrated circuit against a global data erasure.
Abstract:
L'invention concerne un procédé d'exécution d'une commande d'écriture d'un mot binaire dans une mémoire programmable, comprenant des étapes d'écriture de chacun des bits (RB) dans un état programmé d'un mot binaire à écrire (D) dans une cellule mémoire correspondante de la mémoire, de lecture de chaque bit (MB) du mot écrit dans la mémoire (MEM) correspondant à un bit (RB) à l'état programmé du mot à écrire, de comparaison de chaque bit (RB) à l'état programmé du mot à écrire à un bit correspondant (MB) lu dans la mémoire, et de génération d'un signal d'erreur (ER) si au moins un bit du mot à écrire à l'état programmé est différent du bit correspondant lu. Application de l'invention notamment aux circuits intégrés pour carte à puce.