Abstract:
A memory comprises memory cells arranged in a memory array, and an address decoder to apply memory cells selection signals to the memory array according to a read address applied to the memory. The memory comprises an address reconstruction circuit which reconstructs at least one part of the read address from the memory cells selection signals, and supplies a first reconstructed address able to detect an error injection affecting the selection signals. Particularly but not exclusively applicable to the integrated circuits for chip cards.
Abstract:
To form a ramp signal for the programming of a memory cell without losing excess voltage in a control circuit, the output of a voltage pull-up circuit is connected to the programming input using a P type transistor. It is shown that this P type transistor then charges the memory array at constant current, prompting a linear increase of the voltage. This results in preventing the memory cell that is to be programmed from being subjected to excessively sudden variations of voltage. It is shown that by acting in this way, the integrated circuit can be made to work even with very low voltages.
Abstract:
The invention is a device to detect the logic state of a component whose impedance depends on this state, the device including means to generate a current and a measurement voltage so that the current consumption remains constant during cell detection regardless of the state detected, the device also including means to detect the logic state of the component.
Abstract:
An integrated circuit includes non-volatile storage configured to secretly store a digital word, the value of which forms an identification code. The integrated circuit also includes control circuitry configured to receive the digital word and to generate transient electrical currents or transient voltages, the characteristics of which depend on the value of the digital word. There is an electrically conductive network configured to be passed through by the electrical currents or receive the transient voltages so as to generate an electromagnetic field that identifies the integrated circuit.
Abstract:
The disclosure relates to detectors of the level of supply voltage in an integrated circuit. The disclosed detector is designed to detect the crossing of low levels of supply voltage. It comprises a first arm to define a first reference voltage and a second arm to define a second reference voltage, these two reference voltages varying differently as a function of the supply voltage and their curves of variation intersecting for a value of the supply voltage located close to a desired threshold. A comparator receives the two reference voltages. The first arm has a resistive divider bridge, an intermediate connector of which constitutes the first reference voltage. The second arm comprises a resistor series-connected with a native P type MOS transistor, the point of junction of this resistor and this transistor constituting the second reference voltage. A non-linear element may be parallel-connected to the resistor which constitutes the first reference voltage.
Abstract:
A voltage reference generator includes a voltage source and a differential amplifier. The voltage source supplies a stable voltage reference to a positive input of the differential amplifier which is configured as a follower having its output looped back to its negative input. The negative feedback loop is a variable-resistance loop that is controlled by the output of the differential amplifier. The variable-resistance feedback loop transiently imposes open-loop operation when the voltage reference generator is turned on so as to provide high current to the output before imposing closed-loop operation in follower mode.
Abstract:
The component comprises a first memory (MM) comprising a first portion (P1) having a content modified with a first modification entity (K1) and a second portion (P2) having a content modified with a second entity (K2), a storage means (MS) configured to store the first entity (K1) secretly, a non-volatile memory (NVM) storing an item of entity information representative of the second entity (K2) in a location (END) designated by a first indication (INDK2) contained in the said first portion of the first memory.
Abstract:
A memory device may include a memory plane including a group of memory cells configured to store a block of bits including data bits and parity bits, and a detector for detecting a fault injection including a reader to read each bit, and a first checker to perform, when reading a block, a parity check based on the read value of each data and parity bit. The memory plane may include reference memory cells arranged between some of the memory cells to create packets of m memory cells. Each reference memory cell may store a reference bit and each packet of m memory cells may store m bits of the associated block, when m is greater than 1, with different parities. The detector may further include a second checker to perform, when reading the block, a check on the value of each reference bit.
Abstract:
An integrated circuit chip includes: a plurality of parallel wells of alternated conductivity types formed in the upper portion of a semiconductor substrate of a first conductivity type; in each well of the first type, a plurality of MOS transistors having a channel of the second conductivity type, and in each well of the second type, a plurality of MOS transistors having a channel of the first type, transistors of neighboring wells being inverted-connected; and a device of protection against attacks, including: a layer of the second type extending under said plurality of wells, from the lower surface of said wells; and regions of lateral insulation between the wells, said regions extending from the upper surface of the wells to said layer.
Abstract:
The disclosure relates to detectors of the level of supply voltage in an integrated circuit. The disclosed detector is designed to detect the crossing of low levels of supply voltage. It comprises a first arm to define a first reference voltage and a second arm to define a second reference voltage, these two reference voltages varying differently as a function of the supply voltage and their curves of variation intersecting for a value of the supply voltage located close to a desired threshold. A comparator receives the two reference voltages. The first arm has a resistive divider bridge, an intermediate connector of which constitutes the first reference voltage. The second arm comprises a resistor series-connected with a native P type MOS transistor, the point of junction of this resistor and this transistor constituting the second reference voltage. A non-linear element may be parallel-connected to the resistor which constitutes the first reference voltage.