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Logic synthesis of reversible circuits has received considerable attention in the light of advances recently made in quantum computation. Implementation of a reversible circuit is envisaged by deploying several special types of quantum gates, such as k-CNOT. Although the classical stuck-at fault model is widely used for testing conventional CMOS circuits, new fault models, namely single missing-gate...
For two-pattern at-speed scan testing, the excessive power supply noise at the launch cycle may cause the circuit under test to malfunction, leading to yield loss. This paper proposes a new weight assignment scheme for logic switching activity; it enhances the IR-drop assessment capability of the existing weighted switching activity (WSA) model. By including the power grid network structure information,...
This paper presents a framework that utilizes Boolean difference theory to find test vectors for stuck-at-fault detection. The framework reads in structural-style Verilog models, and automatically injects single stuck-at-faults (either stuck-at-zero or stuck-at-one) into the models. The simulations are then performed to find minimal sets of test vectors. Using this setup, we conducted experiments...
This paper proposes a method to compute delay values in 3-valued fault simulation for test cubes which are test patterns with Xs. Because the detectable delay size of each fault by a test cube is fixed after assigning logic values to the Xs in the test cube, the proposed method computes a range of the delay values of the test patterns covered by the test cube. By using the proposed method, we can...
IR-drop problem during test mode exacerbates delay defects and results in false failures. In this paper, we take the X-filling approach to reduce IR-drop effect during at-speed test. The main difference between our approach and the previous X-filling methods lies in two aspects. The first one is that we take the spatial information into consideration in our approach. The second one is how X-filling...
Multi-detect (N-detect) testing suffers from the drawback that its test length grows linearly with N. We present a new method to generate compact test sets that provide high defect coverage. The proposed technique makes judicious use of a new pattern-quality metric based on the concept of output deviations. We select the most effective patterns from a large N-detect pattern repository, and guarantee...
Level-testability of multi-operand adders consisting of carry save adders is shown by showing test design for them. A multi-operand adder is a main part of a multiplier. 6L+2 patterns are sufficient to test a multi-operand adder under cell fault model, where L denotes the depth of the multi-operand adder. A test method of the multi-operand adder used as a partial product compressor in a multiplier...
Since scan testing is not based on the function of the circuit, but rather its structure, scan testing is considered to be a form of over testing or under testing. It is important to test VLSIs using the given function. Since the functional specifications are described explicitly in the FSMs, high test quality is expected by performing logical fault testing and timing fault testing. This paper proposes...
Latest VLSI circuits face the problem of power dissipation not only in design phase but also during testing phase. Power dissipation during testing may be increased up to three times more than that during normal operation. Testing power, testing time and test area overhead are the critical parameters to be optimized for large and complex VLSI circuits. Scan architectures are widely used in testing...
As manufacturers go into volume production with 90 nm designs and below, the floating gate defect (FGD) diagnosis has become a challenge in the initial yield ramp. Since floating gate can result in state-holding, intermittent and pattern-dependent fault effects, these models are generally more complex. Consequently, logical testing is proven can not guarantee the detection of the defect. In this paper,...
This paper presents a new characterization methodology of CMOS sequential standard cells for defect based voltage testing. It allows to estimate the probabilities of physical defects occurrences in a cell, describes its faulty behavior caused by the defects and finds the test sequences that detect those faults. Finally, all of found sequences are validated to check their effectiveness in fault covering...
Defective part levels of zero are almost impossible to achieve in an era of complex defects, process variations, and limited testing resources. It is important to ensure that any defects missed during test will impact the end user as little as possible. However, optimizing test sets for superior detection of critical defects requires an understanding of relative fault criticality, and this determination...
This paper discusses in detail the development process of general interface adapter in the digital circuit fault diagnosis system based on VXI. After introducing VXI bus, the paper gives overall description of fault diagnosis system, presents a method of solving the problem about load matching and interface matching, and realizes the function of identification to read and write on the memory of interface...
Simultaneous switching noise (SSN) is an important issue for the design and test and actual ICs. In particular, SSN that originates from the internal logic circuitry becomes a serious problem as the speed and density of the internal circuit increase. In this paper, an on-chip monitor is proposed to detect potential logic errors in digital circuits due to the presence of SSN. This monitor checks the...
We propose a built-in scheme for generating all patterns of a given deterministic test set T. The scheme is based on grouping the columns of T, so that in each group of columns the number ri of unique representatives (row subvectors) as well as their product R over all such groups is kept at a minimum. The representatives of each group (segment) are then generated by a small finite state machine (FSM)...
Sets of Pairs of Functions to be Distinguished (SPFD) is a functional flexibility representation method that was recently introduced in the logic synthesis domain, and promises superiority in exploring the flexibility offered by a design over all previous representation methods. In this work, we illustrate how the SPFD of a particular wire reveals information regarding the number of potential transient...
The objective of using logic BIST for online and periodic testing is to identify defects, like opens, resulting from the wear and tear of the circuit. We have shown that existing test sets have a low coverage for open defects located in scan flip-flops, even though such defects may affect functional operation. Existing Logic BIST structures suffer from the same limitations. A novel Logic BIST architecture...
This paper presents a self-testing framework targeting the LEON3 embedded microprocessor with built-in test-scheduling features. The proposed design exploits existing post production test sets, designed for software-based testing of embedded microprocessors. The framework also includes a constraint-based approach of test-routine scheduling. The initial results show that the test execution time could...
Software-based self-test (SBST) has emerged as an effective strategy for non-concurrent on-line testing of processors integrated in embedded system applications. It offers the potential for on-line testing without any hardware overhead. However, test generation is usually based in a semi-automated approach and gate-level information is required for effective test program generation.In this paper we...
In this paper, we present a novel technique for online testing of feedback bridging faults in the interconnects of the cluster based FPGA. The detection circuit will be implemented using BISTER configuration. We have configured the Block Under Test (BUT) with a pseudo-delay independent asynchronous element. Since we have exploited the concept of asynchronous element known as Muller-C element in order...
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