There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

IEEE transactions on computer-aided design of integrated circuits and systems : a publication of the IEEE Circuits and Systems Society

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私の computer 環境

This paper presents a novel test-data volume-compression methodology called the embedded deterministic test (EDT), which reduces manufacturing test cost by providing one to two orders of magnitude reduction in scan test data volume and scan test time. The presented scheme is widely applicable and easy to deploy because it is based on the standard scan/ATPG methodology and adopts a very simple flow. It is nonintrusive as it does not require any modifications to the core logic such as the insertion of test points or logic bounding unknown states. The EDT scheme consists of logic embedded on a chip and a new deterministic test-pattern generation technique. The main contributions of the paper are test-stimuli compression schemes that allow us to deliver test data to the on-chip continuous-flow decompressor. In particular, it can be done by repeating certain patterns at the rates, which are adjusted to the requirements of the test cubes. Experimental results show that for industrial circuits with test cubes with very low fill rates, ranging from 3% to 0.2%, these schemes result in compression ratios of 30 to 500 times. A comprehensive analysis of the encoding efficiency of the proposed compression schemes is also provided.

Embedded deterministic test

VLSI Test Principles and Architectures: Design for Testability (Systems on Silicon)

This paper introduces embedded deterministic test (EDT) technology, which reduces manufacturing test cost by providing one to two orders of magnitude reduction in scan test data volume and scan test time. The EDT architecture, the compression algorithm, design flow, experimental results, and silicon implementation are presented.

Embedded deterministic test for low cost manufacturing test

This paper introduces a finite memory compactor called convolutional compactor that provides compaction ratios of test responses in excess of 100x even for a very small number of outputs. This is combined with the capability to detect multiple errors, handling of unknown states, and the ability to diagnose failing scan cells directly from compacted responses. A convolutional compactor can be easily configured into a MISR that preserves most of these properties. Experimental results demonstrate the efficiency of compaction for several industrial circuits.

Convolutional compaction of test responses

An apparatus and method provide for an arithmetic built-in self test (ABIST) of a number of peripheral devices having parallel scan registers coupled to a processor core, all within an integrated circuit. Using the data paths of the processor core, operating logic generates pseudo-random test patterns for the peripheral devices, employing a mixed congruential generation scheme. In one embodiment, generating the pseudo-random test patterns includes multiplying n least significant bits of a 2n-bit pseudo-random number generated in an immediately preceding iteration and stored in a first register, with an n-bit multiplier constant stored in a second register to produce a 2n-bit product, adding the 2n-bit product to n most significant bits of the 2n-bit pseudo-random number stored in n least significant locations of an accumulator with 2n locations to produce a new 2n-bit pseudo-random number for a current iteration, and outputting n least significant bits of the new 2n-bit pseudo-random number as an n-bit pseudo-random test vector for the peripheral devices.

Arithmetic built-in self-test of multiple scan-based integrated circuits

A method for compressing test patterns to be applied to scan chains in a circuit under test. The method includes generating symbolic expressions that are associated with scan cells within the scan chains. The symbolic expressions are created by assigning variables to bits on external input channels supplied to the circuit under test. Using symbolic simulation, the variables are applied to a decompressor to obtain the symbolic expressions. A test cube is created using a deterministic pattern that assigns values to the scan cells to test faults within the integrated circuit. A set of equations is formulated by equating the assigned values in the test cube to the symbolic expressions associated with the corresponding scan cell. The equations are solved to obtain the compressed test pattern.

Jerzy Tyszer

Papers

Embedded deterministic test

Embedded deterministic test for low cost manufacturing test

Convolutional compaction of test responses

Arithmetic built-in self-test of multiple scan-based integrated circuits

Test pattern compression for an integrated circuit test environment