Motorola CDM Series Service Manual page 17

Notes For All Schematics and Circuit Boards
LOCK
LSIO
LVZIF CS
MIC
MISO
MODIN
MOSBIAS 2
MOSBIAS 3
NOISE BLNKR
ON OFF CONTROL
ON OFF SENSE (Control Head)
ON OFF SENSE (Controller)
OPT CS
OPT PTT
PA PWR SET
PA SWB
PA SUPVLTG
PCIC MOSBIAS 1
PRESC
PTT IRDEC
PTT IRDECODER
R W
RAM CS
RDY
REF CS
RESET
ROW x
RSSI
RX ADAPT
RX AUD RTN
RX FLAT FILTERED AUDIO
RXIN
RXINJ
SCI RX
SCI TX
SPI
SPKR-
Lock Detect Signal from Synthesizer
Low Speed Clock In / Data Out
LVZIF Chip Select (not used)
Microphone Input
Serial Peripheral Interface Receive Line
Modulation Signal into the Synthesizer
PA Bias Voltage for Second Stage
PA Bias Voltage for Third Stage
Noise Blanker Enable (Low Band only)
Service Request Line from Control Head / Manual
Switching On of the Radio's Voltage Regulators
On/Off Sense Line to Control Head µP
Service Request Line from Control Head
Option Board Chip Select
PTT from Option Board
ASFIC Output Voltage to set the Transmitter
Power
Switches Supply Voltage for PA Current Control
Circuitry
13.2 V Supply Voltage of the Transmitter PA
PA Bias Voltage for First Stage
Prescaler Signal from VCO to Synthesizer
Microphone PTT Input
Microphone PTT Input
Read Write Signal for RAM / Flash
RAM Chip Select
Service Request Line from Option Board
Reference Chip Select (not used)
Reset Line
Keypad Matrix Row x
Received Signal Strength Indicator
Flat TX Path Disable during Transmitter Key-up
Option Board Input / Output of Receiver Audio
Path
Flat or Filtered Audio to Accessory Connector
RF Signal from Antenna Switch into the Receiver
RF Signal from the VCO into the Mixer
Serial Communication Interface Receive Line
Serial Communication Interface Transmit Line
Serial Peripheral Interface Bus
Negative Audio PA Speaker Output
Chapter 1: 2-7
6881091C63-A