摘要:
A system for testing an integrated circuit, the integrated circuit including: flip-flops connected to a logic block and the test system including circuitry for connecting the flip-flops as a register, circuitry for inhibiting the different elements of the logic block capable of disturbing the sequencing of the register or the propagation of the signals into the logic block, and a control circuit for separately controlling the different inhibiting circuits and the circuitry for connecting the flip-flops as a register.
摘要:
In a device for descrambling scrambled digital data, the digital data are grouped into parallel combinations of bits before being descrambled. The combinations of bits are descrambled and then split back into a serial stream of bits.
摘要:
The present invention relates to a method for generating pulses using a microprocessor including a CPU and a counter programmable by at least one control bit and of a counting threshold, consisting of generating a first edge of a pulse by unconditionally forcing the state of an output signal of the counter to a state corresponding to a state of the control bit, and generating a second edge of the pulse by switching the state of the output signal at the end of the counting threshold.
摘要:
The present invention relates to an electronic device of the “SMARTCARD” type including a single input/output lead for communicating with the microcontroller from the outside. Interface registers between a peripheral and the microcontroller are likely to be connected according to a shift register configuration forming a test scan path accessible in series and clocked by a clock signal to be applied to a peripheral clock lead. A test aid circuit, in a scan mode, connects the interface registers according to the shift register configuration, the scan mode being selected when a test bit, accessible through the input/output lead, is enabled and the input/output lead is forced from the outside to a state distinct from its default state.
摘要:
The present invention relates to a method for generating pulse trains by means of a microprocessor, consisting of generating an envelope signal by means of a timer which is programmable by a CPU, the width of a square wave of the envelope signal corresponding to the width of the pulse trains, generating a carrier signal having a predetermined frequency, and modulating the envelope signal with the carrier.