Motorola XPR 4550 Посібник з монтажу - Сторінка 37
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Term
firmware
FGU
flash
frequency
frequency
generation unit
General-Purpose
Input/Output
GPIO
host code
IC
IF
inbound signaling
word
integrated circuit
ISW
kHz
kilohertz
LCD
LED
light emitting diode
liquid-crystal display
6816812H01
Code executed by an embedded processor such as the Host or DSP in
a subscriber radio. This type of code is typically resident in non-volatile
memory and as such is more difficult to change than code executed
from RAM.
See frequency generation unit.
A non-volatile memory device similar to an EEPROM. Flash memory
can be erased and reprogrammed in blocks instead of one byte at a
time.
Number of times a complete electromagnetic-wave cycle occurs in a
fixed unit of time (usually one second).
This unit generates ultra-stable, low-phase noise master clock and other
derived synchronization clocks that are distributed throughout the
communication network.
Pins whose function is programmable.
See General-Purpose Input/Output.
Object code executed by the host processor in an ASTRO subscriber
radio. The host is responsible for control-oriented tasks such as
decoding and responding to user inputs.
See integrated circuit.
Intermediate Frequency.
Data transmitted on the control channel from a subscriber unit to the
central control unit.
An assembly of interconnected components on a small semiconductor
chip, usually made of silicon. One chip can contain millions of
microscopic components and perform many functions.
See inbound signaling word.
See kilohertz.
One thousand cycles per second. Used especially as a radio-frequency
unit.
See liquid-crystal display.
See light emitting diode.
An electronic device that lights up when electricity is passed through it.
An LCD uses two sheets of polarizing material with a liquid-crystal
solution between them. An electric current passed through the liquid
causes the crystals to align so that light cannot pass through them.
Definition
Glossary-3
March 23, 2006