摘要:
One delay circuit is inserted in open loop inside a clock recovery circuit for improving the accuracy of clock recovery. One oscillator signal φ(0) to φ(2i−1) is provided with a basic Step of Time. A rational number of Step of Time corresponding to a bit-duration is measured inside a received flow of bits. The oscillator signal φ(0) to j(2i−1) is transformed into a clock signal CK having active edges of said clock signal in phase with at least one oscillator signal φ(0) to φ(2i−1), two consecutive active edges being separated by a time duration proportional to the integer part of the number of Step of Time. A time delay is computed proportional to the fractional part of the number of Step of Time. The next active edge of the clock signal CK is delayed of said computed delay.
摘要:
A bridge circuit 10 is provided between first data port A1, A2 and second data port B1, B2. The bridge circuit comprises a first transceiver stage 40 comprising at least one input buffer 11, 14 and at least one tri-state output buffer 12, 13 linked to the first data port, a second transceiver stage 50 comprising at least one input buffer 21, 24 and at least one tri-state output buffer 12, 13 linked to the second data port, a first detection circuit 31 for detecting the arrival of a packet by the first data port, a second detection circuit 37 for detecting the arrival of a packet by the second data port. A selection circuitry 34, 35 enables the output of tri-state output buffer of the first or of the second transceiver stage depending of the detection made by the first and second detection circuits.
摘要:
One delay circuit is inserted in open loop inside a clock recovery circuit for improving the accuracy of clock recovery. One oscillator signal φ(0) to φ(2i-1) is provided with a basic Step of Time. A rational number of Step of Time corresponding to a bit-duration is measured inside a received flow of bits. The oscillator signal φ(0) to j(2i-1) is transformed into a clock signal CK having active edges of said clock signal in phase with at least one oscillator signal φ(0) to φ(2i-1), two consecutive active edges being separated by a time duration proportional to the integer part of the number of Step of Time. A time delay is computed proportional to the fractional part of the number of Step of Time. The next active edge of the clock signal CK is delayed of said computed delay.
摘要:
A device includes a serial port for connecting as a slave to a master device through a serial link. The device further includes a detection circuit for detecting the presence of an impedance of the master device, linked to a terminal of the serial port. The device can be used with microprocessor cards comprising a USB port.
摘要:
An electronic circuit (CE) is provided with an oscillator (OSC—1) outputting a signal (S1) with a frequency (F1) varying as a function of the temperature (Tc) of this circuit, and receiving or outputting a signal (S2) with a fixed and known frequency (F2). This circuit includes a measurement module (MSR) outputting a measurement signal (Φ1) representative of the variable frequency (F1) evaluated using the fixed frequency signal (S2) used as a reference or standard, and a conversion module (CVRS) applying a transfer function (u−1, v−1, or w−1) that is the inverse of the function for the variation of the frequency of the first signal (S1) as a function of the temperature, to the measurement signal (Φ1), in order to output a signal (Φc) representative of the circuit temperature (Tc).
摘要:
An electronic circuit (CE) is provided with an oscillator (OSC—1) outputting a signal (S1) with a frequency (F1) varying as a function of the temperature (Tc) of this circuit, and receiving or outputting a signal (S2) with a fixed and known frequency (F2). This circuit includes a measurement module (MSR) outputting a measurement signal (Φ1) representative of the variable frequency (F1) evaluated using the fixed frequency signal (S2) used as a reference or standard, and a conversion module (CVRS) applying a transfer function (u−1, v−1, or w−1) that is the inverse of the function for the variation of the frequency of the first signal (S1) as a function of the temperature, to the measurement signal (Φ1), in order to output a signal (Φc) representative of the circuit temperature (Tc).
摘要:
A bridge circuit 10 is provided between first data port A1, A2 and second data port B1, B2. The bridge circuit comprises a first transceiver stage 40 comprising at least one input buffer 11, 14 and at least one tri-state output buffer 12, 13 linked to the first data port, a second transceiver stage 50 comprising at least one input buffer 21, 24 and at least one tri-state output buffer 12, 13 linked to the second data port, a first detection circuit 31 for detecting the arrival of a packet by the first data port, a second detection circuit 37 for detecting the arrival of a packet by the second data port. A selection circuitry 34, 35 enables the output of tri-state output buffer of the first or of the second transceiver stage depending of the detection made by the first and second detection circuits.
摘要:
A method for generating a random number, comprising steps of receiving a data transmission binary signal subjected to phase jitter, generating several oscillator signals substantially of a same average frequency and having distinct respective phases, sampling a status of each of the oscillator signals upon the appearance of edges of the binary signal, and of generating a random number using the statuses of each of the oscillator signals. The method may be applied to an integrated circuit usable in a smart card.
摘要:
A method for generating a random number, comprising steps of receiving a data transmission binary signal subjected to phase jitter, generating several oscillator signals substantially of a same average frequency and having distinct respective phases, sampling a status of each of the oscillator signals upon the appearance of edges of the binary signal, and of generating a random number using the statuses of each of the oscillator signals. The method may be applied to an integrated circuit usable in a smart card.
摘要:
A device includes a serial port for connecting as a slave to a master device through a serial link. The device further includes a detection circuit for detecting the presence of an impedance of the master device, linked to a terminal of the serial port. The device can be used with microprocessor cards comprising a USB port.