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Glossary
A/D Analog-to-Digital converter; converts an instantaneous dc voltage level to a
corresponding digital value.
ABACUS IC Custom integrated circuit providing a digital receiver IF backend.
CPS Customer Programming Software
CODEC Coder/Decoder IC for analog-to-digital and digital-to-analog conversion.
D/A Digital-to-Analog converter; converts a digital value to a corresponding dc voltage value.
DTMF Dual-Tone Multi-Frequency
DPL Digital Private-Line™
DSP Digital Signal Processor; microcontroller specifically tailored for signal processing
computations. In this case refers specifically to Motorola DSP56603.
Firmware Software or a software/hardware combination of computer programs and data, with a
fixed logic configuration stored in a read-only memory; information can not be altered or
reprogrammed.
FGU Frequency Generation Unit
FLASHport™ A Motorola term that describes the ability of a radio to change memory. Every
FLASHport radio contains a FLASHport EEPROM memory chip that can be software
written and rewritten to, again and again.
Host Motorola HC12A4 microcontrol unit U204 (see MCU).
Host Port Parallel memory mapped interface consisting of eight registers in the DSP56603.
IC Integrated Circuit
IMBE Improved Multi-Band Excitation: a sub-band, voice encoding algorithm used in ASTRO
digital voice.
MCU MicroControl Unit
MDC Motorola Digital Communications
MISO Master In Slave Out; used by the slave device to send data to the master device
MOSI Master
Out Slave In; used by the master device to send data to the slave device.
Open Architecture A controller configuration that utilizes a microprocessor with extended ROM and RAM.
PC Board Printed Circuit board
PCIC Power Control IC
PL Private-Line
®
tone squelch; a continuous sub-audible tone that is transmitted along with
the carrier.
PLL Phase-Locked Loop; a circuit in which an oscillator is kept in phase with a reference,
usually after passing through a frequency divider.
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