Friday, September 30, 2016

Embedded System Glossary – L

Embedded System Terminology - L

Lamp - An electrical device that produces light. There are many types of lamps used on different types of embedded devices, including neon (via neon gas), incandescent (producing light via heat), and xenon flash lamps (via some combination that includes high voltage, gas, and electrodes), to name a few.
Large Scale Integration (LSI) - A reference to the number of electronic components in an IC. A LSI chip is an IC containing 3000–100,000 electronic components per chip.
Latch - A bistable multivibrator that has signals from its output fed back into its inputs, and can hold stable at only one of two possible output states: 0 or 1. Latches come in several different subtypes, including S-R, Gated S-R, and D.
Latency - The length of elapsed time it takes to respond to some event.
Least Significant Bit (LSb) - The bit furthest to the right of any binary version of a number.
Least Significant Byte (LSB) - The 8 bits furthest to the right of any binary version of a number; for example, the two digits furthest to the right of any hexadecimal version of a number larger than a byte.
Light Emitting Diode (LED) - Diodes that are designed to emit visible or infrared (IR) light when in forward bias in a circuit.
Lightweight Process - See Thread.
Linker - A software development tool used to convert object files into executable files.
Lint - A software development tool used to check C and C++ programs for error-prone syntactical constructs.
Linux - A GNU-based Unix-like open source operating system
Little Endian - Data represented or stored in such a way that the LSB and/or the LSb is stored in the lowest memory address.
Loader - A software tool that relocates developed software into some location in memory.
Local Area Network (LAN) - A network in which all devices are within close proximity to each other, such as in the same building or room.
Locator - A software development tool that assigns physical addresses to a relocatable program. This is the last step in preparing software for execution by an embedded system. The resulting file is called an executable. In some cases, the locator's functionality is built into the linker.
Logic Analyzer - A hardware debugging tool that can capture and display the logic levels (0 or 1) of dozens, or even hundreds, of electrical signals as they occur.
Logical Memory - Physical memory as referenced from the software’s point-of-view, as a one dimensional array. The most basic unit of logical memory is the byte. Logical memory is made up of all the physical memory (registers, ROM, and RAM) in the entire embedded system.
Loudspeaker - See Speaker.
Low-Level Language - A programming language which more closely resembles machine language. Unlike high-level languages, low-level languages are hardware dependent, meaning there is typically a unique instruction set for processors with different architectures.

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Related topics:
Embedded System Architecture   |   Embedded Hardware Architecture   |   Embedded Software Architecture   |   Embedded Software Definition   |   Embedded System Acronyms   |   Embedded System Symbols

List of topics: Embedded System

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