THEORY OF OPERATION (TRANSCEIVER) 4.1 - 9
Controller Section
The controller section contains the Patriot Bravo dual core (DSP / RISC) processor and its external
memory, the TX and RX audio processing, the serial interfaces and I/O circuitry.
The Patriot Bravo controls the receive / transmit frequencies, power levels, Enhanced Control Head
display and keypad, serial interfaces, accessories, MMI, and other terminal functions. This
microprocessor can be operated through the RS232 interface by a personal computer to program
the FLASH.
The TX audio circuitry selects between the different microphone inputs, controls the TX audio level
and converts the analog audio signal to a digital format.
The RX audio circuitry converts the received signal from digital format to an analog audio signal,
performs volume control and amplifies the signal to speaker level.
The DSP performs signalling, and voice encoding and decoding.
Figure 4.1-5 Controller Block Diagram
ABACUS III
ADDAG
ABACUS III
ADDAG
JAVELIN
LVFRACN
ESCORT
PCIC
ADDAG_TXE
AGC_0_FE
AGC_1_FE
AGC_2_IF
LO2 ON
Switched
by
intern
al
Patriot
register
(GPCR
)
BBP
SAP
SPIA
SPIB
UARTB
UARTA
GPIO
EIM
MCU
DSP
L1T
SRAM
4 M Byt
1.8V
Option Slot
24-PIN (GPS)
FLASH
16 M Byte
RESET_OUT
RESET_JAV_ADDAG
RESET_ABACUS
GPS_RESET
3V0
CODEC
MC145483
Audio
MUX
/E2POT
AF-PA
Option Slot
40 pin (UCM)
J0550
12
pin
J0400
16
+
4 pin
Mic
ON_OF
F_
CTRL
Front
Rear
Level
shifter
& buffer
Level
shifter
& buffer
Mux control / PA enable
SB9600 / JTAG / RS232 / USB
SBEP
A+
SW B+
5V
Mic+RXaudio,
Speaker audio
Key fail / flash
SPIB
SW B+
On/Off
Soft turn o
ff
On/Off Ctrl
Emergency
Ext. Alarm
Ext. PTT
Ignition
Mic
J0500
40
pin
Front
18 pin FLEX
connection
board
J0570
J0450
AP
J0600
4 wire
CESG
Memory
Ignition / Emergeny
8 wire
I/O
PWM
ADC
Battery Voltage
PA Temp
RTC
1.8V
16.8MHz
32.768kHz
1.55V
PATRIOT
6866539D31.book Page 9 Tuesday, March 20, 2007 6:32 PM
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