51795B datasheet(85/100 Pages) MICROCHIP

85 / 100 page

Glossary

 2010 Microchip Technology Inc.

DS51795B-page 85

L-value

An expression that refers to an object that can be examined and/or modified. An l-value

expression is used on the left-hand side of an assignment.

Latency

The time between an event and its response.

Librarian

See Archiver.

Library

See Archive.

Linker

A language tool that combines object files and libraries to create executable code,

resolving references from one module to another.

Linker Script Files

Linker script files are the command files of a linker. They define linker options and

describe available memory on the target platform.

Listing Directives

Listing directives are those directives that control the assembler listing file format. They

allow the specification of titles, pagination and other listing control.

Listing File

A listing file is an ASCII text file that shows the machine code generated for each C

source statement, assembly instruction, assembler directive, or macro encountered in

a source file.

Little Endian

A data ordering scheme for multibyte data whereby the Least Significant Byte (LSB) is

stored at the lower addresses.

Local Label

A local label is one that is defined inside a macro with the LOCAL directive. These

labels are particular to a given instance of a macro’s instantiation. In other words, the

symbols and labels that are declared as local are no longer accessible after the ENDM

macro is encountered.

Logic Probes

Up to 14 logic probes can be connected to some Microchip emulators. The logic probes

provide external trace inputs, trigger output signal, +5V, and a common ground.

Loop-Back Test Board

Used to test the functionality of the MPLAB REAL ICE in-circuit emulator.

LVDS

Low Voltage Differential Signaling. A low noise, low-power, low amplitude method for

high-speed (gigabits per second) data transmission over copper wire.

LVDS differs from normal input/output (I/O) in a few ways:

Normal digital I/O works with 5 volts as a high (binary ‘1’) and 0 volts as a low (binary

‘0’). When you use a differential, you add a third option (-5 volts), which provides an

extra level with which to encode, and results in a higher maximum data transfer rate.

A higher data transfer rate means fewer wires are required, as in UW (Ultra Wide) and

UW-2/3 SCSI hard disks, which use only 68 wires. These devices require a high trans-

fer rate over short distances. Using standard I/O transfer, SCSI hard drives would

require a lot more than 68 wires.

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