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Computer implemented circuit synthesis system. A key handling circuit for a switching matrix having row and column conductors includes bidirectional drives for the row conductors and the column conductors. Koninklijke Philips Electronics N. These means for setting the output voltage are controlled by a control signal 15 which depends on the mode signal that indicates whether the signal is in the test mode or in souev operation mode.

The resulting ATPG vectors are then modified souet perform pseudo scan of selected components of the original circuit. The memory is configured to provide a database, and is operative to store a netlist including nets of an integrated circuit under design.

An integrated circuit is disclosed comprising a plurality of lautent portionseach of the circuit portions having an internal supply rail coupled to a global supply rail via a cluster of switches ; coupled in parallel between the internal supply rail and the global supply rail The invention relates to a testable integrated circuit.

Laurent Souef

In an integrated circuit incorporating a series of sequential cells SEQ 1 -SEQ 7 implementing a shift function, clock skew problems are avoided by interconnecting the cells in order starting with the cell SEQ 3 having greatest clock latency and ending with the cell SEQ 7 having smallest clock latency. The row drive provides a current input for the column drive in one phase of operation and the column drive provides a current input for a row drive in a second phase of operation. Thus, no power consumption of such stages takes place during functional operation.

The present invention, generally speaking, provides an integrated circuit testing technique in which hardware accessibility of selected components is exploited in order to avoid scan insertion overhead but achieve as good or better fault coverage than if scan insertion had been used. The row drive and the column drive are in a low conductive condition except when a relevant key switch is activated.


BibTeX records: Laurent Souef

This testing method speeds up the process by increasing the speed of shifting test vectors and results into and out of the shift register, but without comprising the stability of the testing process. Pseudo-scan testing using hardware-accessible IC structures.

In the scan test mode, the counter operates as a shift register and it is fully testable. A computer implemented circuit synthesis system includes a memory, an automatic test pattern generation ATPG algorithm, and processing circuitry.

The automatic test pattern generation ATPG algorithm is operative to design and test an integrated circuit design. The output response of the integrated circuit to the test vector is provided under the control of a second clock signal 56 which is slower than the first clock signal.

Laurent Souef Inventions, Patents and Patent Applications – Justia Patents Search

The test arrangement comprises a test control input; a test output coupled to the respective internal supply rails and control means, coupled to the test control input for enabling a selected cluster of switches ; in the test mode. Cell with fixed output voltage for integrated circuit. Method of discriminating between different types of scan failures, computer readable code to cause a display to graphically depict one or more simulated scan output data sets versus time and a computer implemented circuit simulation and fault detection system.

Laurent Souef, Didier Gayraud. Jerome Bombal, Laurent Souef. Each of the stages or cells comprises a flip-flop and a multiplexer which together operate as a toggle flip-flop only when all of the previous flip-flops are set.

Design for test area optimization algorithm. Each cluster of switches ; has a first switch having a first size and a second switch having a second size, a fault-free first switch having a higher resistance than a fault-free second switch In order to replace ground and VDD in certain points of such a circuit, the circuit comprises a cell 34 which comprises a flipflop 11 and means 31 able to set the output voltage of the cell when the circuit is in the operation mode.

The result is that the flip-flop clock is forced high preventing any transition of the flip-flop internal clock tree for all stages or cells where the output is low. The test program extracts the simulated scan flops and graphically displays the simulated scan flops versus time.


A low power scannable asynchronous counter which is fully testable and which consumes low power in a functional mode consists of counter cells cascaded through NOR gate circuits to which clock signals are applied for each of the stages or cells. Patrick Da Silva, Laurent Souef. Existing ATPG tools may be used without modification by performing scan insertion on a “dummy” circuit and performing ATPG on the scan-augmented dummy circuit.

Clock-skew resistant chain of sequential cells. Low power scannable counter.

Furthermore, the method can be implemented without requiring additional complexity of the testing circuitry to be integrated onto the circuit substrate. A method of discriminating between different types of simulated scan failures includes simulating a scan enable signal to a circuit represented by a netlist corresponding to a scan chain coupled to combinatorial logic soufe tested, simulating initiation of a data capture cycle in the netlist corresponding to the scan chain, the data capture cycle simulating a series of scan flops from the scan chain being simulated together with the combinatorial logic and simulating scanning data out from each flop in the scan chain and into a test program.

Laurent Souef, Emmanuel Alie. A method of testing an integrated circuit, comprises providing a test vector to a shift register arrangement by providing test vector bits in series into the shift register arrangement 20 souer with a first, scan, clock signal The term “pseudo-scan” is used to refer to the use of read and write instructions to achieve the equivalent effect as scan insertion without the addition of scan flops. The IC further comprises laurdnt test arrangement for testing the respective clusters of switches ; in a test mode.

Frederic Natali, Laurent Souef. Method of testing an integrated circuit by simulation. Laurent Souef has filed for patents to protect the following inventions. The test vector bits are passed laurenf adjacent portions of the shift register arrangement timed with the first clock signal 42 and an output response of the integrated circuit to the test vector is provided and lauurent.