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Test Definitions


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  The latest in the V series of modem standards. V.90 modems can theoretically transmit data downstream (that is, from a remote machine to the one in which the modem is installed) an 56Kbps.
Source: HostPulse
  A "post-silicon" process to prove (with evidence) a design to be valid. For our purposes, validation is any use of special purpose test hardware to prove the product meets the design intent; as opposed to other usage of the same equipment as a manufacturing screen.
Source: NP Test
Validation Testing
  Checking a program against the published user or system requirements.
Source: Master Test Engineer Glossary
Value Change Dump
  (VCD) - A standard file format used to log changes to variable values, such as the values of signals, in a file during a simulation session.
Source: DAFCA Inc.
Vapor Phase Soldering
  (VPS) - A surface mount process in which a substrate carrying components attached by solder paste is lowered into the vapor-cloud of a tank containing boiling hydrocarbons. This melts the solder paste thereby forming good electrical connections. However, vapor-phase soldering is becoming increasingly less popular due to environmental concerns.
Source: Maxfield & Montrose Interactive Inc.
  (VPS) - Soldering accomplished by using heat generated by the condensing of a vapor ion a cooler assembly. VSP is achieved with SMT by using a high temperature, approximately 215 degrees C, special prefluorinated fluid.
Source: Surface Mount Technology Association
  Refers to either hardware or software that exist only in the minds of the people who are trying to sell them to you.
Source: Maxfield & Montrose Interactive Inc.
  A measure of variability; the average squared deviation from the mean; the square of the standard deviation.
Source: AGS Publishing
  A vector is the space diagonal of the x, y and z coordinates.
Source: Carl Zeiss
  The collection of logical 1's and 0's applied to a chip at a given point in time. Usually the vector is referenced from a synchronizing clock signal -- in this case, the definition of a vector is the collection of logical 1's and 0's applied per clock edge. Scan vectors are a special case in where a single scan vector is the collection of logical 1's, 0's, and clocks required to load a scan chain.
Source: Inovys
Vector Efficiency
  Also known as “fault efficiency” or “fault efficient vectors” -- a metric that concerns the “faults per clock-cycle”, or the fault coverage content of a vector set in relation to the size of the vector set. A rating of more faults-per-vector is generally good, but a higher rating indicates vectors with high activity content which may consume more power during application.
Source: Inovys
Vector Masking
  The ability to ignore an “expected response value” of an output vector. In the context of this text, this has two applications, the ability of an ATPG tool to print vectors in a data format that includes a vector mask (a pseudo-vector that maps onto an output vector and indicates which bits of the vector are “cared”); the ability of the test platform to ignore output values that are not required as part of the test on a vector-by-vector basis.
Source: Inovys
Vector Network Analysis
  Measurement technique which allows complete characterization of single or multiport networks. The magnitude and phase of the measurand are determined. The transmission function and the reflection coefficient are usually measured in RF engineering.
Source: Willtek Communications, Inc.
Vector Notation
  A notation used in logic simulation and synthesis in which a single name is used to reference a group of signals, and individual signals within the group are referenced by means of an index; for example, a[3:0] = a[3], a[2], a[1], and a[0].
Source: Maxfield & Montrose Interactive Inc.
Vector Signal Analyzer
  (VSA) - An instrument which allows modulation analysis of modern digital signals. The instrument is similar to that of an oscilloscope, however; the VSA allow the additional analysis of both the In-phase (I) and Quadrature-phase (Q) components of a signal. Modern eavesdropping devices which utilize vector modulation techniques often may only be identified by examining the I/Q components of a electromagnetic anomaly.
Source: Granite Island Group
Vectorless Testing
  The cost effectiveness of on-chip I/O BIST combined with ATE-based signal integrity measurements. Specifically, the concept unites ATE parametric testing with on-chip test content generation and compare, forming a synergy between silicon and ATE. The result is an economical optimized solution for high-volume manufacturing test designed into the silicon, using established EDA techniques.
Source: EE Times Asia
Velocity Transducer
  An electrical/mechanical transducer whose output is directly proportional to the velocity of the measured unit. A velocity transducer consists of a magnet suspended on a coil, surrounded by a conductive coil. Movement of the transducer induces movement in the suspended magnet. This movement inside the conductive coil generates an electrical current proportional to the velocity of the movement. A time waveform or a Fourier transform of the current will result in a velocity measurement. The signal can also be integrated to produce a displacement measurement.
Source: Vibration Institute
  The verification process is typically the creation of a Declaration of conformity stating that the emissions limits are within the FCC Part 15 rules. Devices that are not intentional transmitters would typically get a FCC Part 15 Declaration of Conformity by submitting their device to an accredited Test Laboratory, having the device tested, and then receiving a test report and Declaration of Conformity.
Source: Agile Test Group
  The task of establishing the correctness of a design using EDA tools to automatically check the timing, connections, and rules used to design the circuit.
Source: EE Design
  Part of the design process that checks to make sure the design operates as the designer intended. Simulation is a type of verification.
Source: Xilinx
  A "pre-silicon" process done during development, for gaining confidence, that a Design will produce a pre-defined result. An output of verification may be translated into ATE vectors (used for functional testing).
Source: NPTest
Verification and Validation
  (V&V) - Verification ensures that the final product satisfies or matches the original design (low-level checking) — i.e., you built the product right. Validation checks that the product design satisfies or fits the intended usage (high-level checking) — i.e., you built the right product. According to the Capability Maturity Model (CMMI-SW v1.1), “Verification confirms that work products properly reflect the requirements specified for them. In other words, verification ensures that ‘you built it right’. Validation confirms that the product, as provided, will fulfill its intended use. In other words, validation ensures that ‘you built the right thing’”.
Source: Wikipedia
Verification Tests
  Checking the program against the most closely related design document(s) or specification(s).
Source: Master Test Engineer Glossary
  A hardware description language developed by Gateway Design Automation (now part of Cadence) in the 1980s which became very popular with ASIC and IC designers.
Source: EE Design
  A design language that designers use when creating FPGA or ASIC designs.
Source: Xilinx
Verilog Change Dump
  (VCD) - Output from Verilog used for pattern generation. Typically this output has to be translated into a format that is readable by a tester. This translation process is typically performed by several third party and in-house tools.
Source: ATE World

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