6815854H01-A
June 15, 2005
Theory of Operation:
Controller Section
3-63
Figure 3-42. XTL 1500 Controller Section
The controller consists of digital logic comprised of a microprocessor (the Patriot IC, U100) and
memory consisting of a 512K x 16 SRAM (U103) and a 4M x 16 FLASH ROM (U102). The
microprocessor is a dual-core processor that contains a DSP56600 core and an MCORE
microcontroller with custom peripherals. The term,
MCU
, refers to the MCORE controller section of
the Patriot IC. The FLASH ROM contains the programs that the Patriot microprocessor executes and
is used to store customer-specific information and radio-personality features that, together,
constitute the
codeplug
. It allows the controller firmware to be reprogrammed for future software
upgrades or feature enhancements. The SRAM is used for scratchpad memory during program
execution.
The controller performs the programming of all peripheral ICs. This is done via a serial peripheral
interface (SPI) bus and through General-Purpose Input/Outputs (GPIO) from the Patriot IC. ICs
programmed through this interface include the LV Frac-N synthesizer, ABACUS III IC, D/A converter
(DAC), A/-D converter (ADC), and volume digital potentiometer.
In addition to the SPI bus, the controller also maintains two asynchronous serial busses: the SB9600
bus and an RS-232/USB serial bus. The SB9600 bus interfaces the controller section to different
hardware accessories, some of which may be external to the radio, including the control head. The
RS-232/USB bus is used as a common data interface for external devices and for programming/
flashing the radio.
User input is from the control head and is sent to the controller through the SB9600 bus. Feedback to
the user is provided by the control-head display.
The controller schedules the activities of the DSP, including setting operational modes and
parameters. The DSP section of the processor contains an 84K x 24 program RAM, 2K x 24 program
ROM, and 62K x 16 data RAM, which are all integrated into the Patriot IC. The vocoder subsystem
consists of this DSP core, the modulation DAC (U0900), and the voice CODEC (U0200).
From ABACUS (U6000)
To TX Modulation DAC (U0900)
To ABACUS (U6000),
LV-FRAC-N (U6751),
DAC (U0959), ADC (U0953)
BBP TX 2.4MHz CLK: 48kHz FS
BBP RX 1.2MHz CLK: 20kHz FS
SPI (CLK, MOSI, MISO)
512kHz CLK, 8kHz FS
SAP SSI Digital Audio
Encryption Connector
Keyfail
AUDIO
CODEC
U0200
Volume POT
U0206
1.8V
To Memory
1.55V
To PATRIOT CORE
SB9600
(UART B)
USB/RS232
(UART A)
5V
SWB+ A+
Mic
Speaker
Control Head
Rear Accessory Connector
VIP’s
EMERG,
PTT*,
IGNITION
SB9600
Circuit
RS232
XCVR
U0305
USB
XCVR
U0304
RS232 (12V)
SB9600 (5V)
SWB+
RS232 (4-wire)
USB
2.85V
To Audio, PATRIOT,
Power Control, UART
XCVRs, Secure
PATRIOT
1.55V
2.85V
From RF Ref. Oscillator
16.8MHz
32kHz
1.8V
1.8V
56600 DSP
DSP RAM
MCORE
EIM
I/O,
UART’s
8MB
FLASH
512kB
SRAM
SW_B+
SW_A+
9V
Regulator
LM2941T
9.3V
5V
To SB9600
and VIP Circuitry
2.85V
Regulator
LP2951
1.8V
Regulator
LP2951
1.55V
Regulator
LP2951
AUDIO PA
U0204
5V
Regulator
MC78M05
Speaker
PGA’s
U0201, U0202
MAEPF-27893-O
Содержание XTL 1500
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