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3-2
USB UART
MUX SELECT
D4100
D4101
D4102
1
1
1
D3204
R3104
D3203
16
9
R3109
R3110
U3100
R3101
R3115
1
R3100
8
R3103
C3210
C3209
R3114
C3212
C3211
R3112
R3122
R3108
R3209
C3106
C3214
C3213
R3211
U3203
R3221
D3208
Q2300
R4206
VOL. A/D
CONVERTER
Figure 3-2. XTL 1500 Control Head Board Sections — Side 2
3.3
Controller Section
The controller consists of a digital logic comprising of an applications processor, the OMAP330 IC,
(U1000) and memory consisting of a 4M x 16 SDRAM (U1300) and a 1M x 16 Flash ROM (U1301).
The applications processor runs on the ARM 9 technology and is capable of processing speeds up to
200 MHz. The Flash ROM contains the programs the OMAP processor executes and is used to store
error logs as well for smooth operation of the radio. The programs allows the both the software in the
control head and firmware in the transceiver to be reprogrammed for future software upgrades or
feature enhancements. The SDRAM is used for scratchpad memory during program execution.
The OMAP processor interacts with all the peripherals in the control head as well as maintaining
constant communications with the transceiver microprocessor using Serial Synchronous Interface
(SSI). Linkage between all the peripherals in the control head is done through the use of Serial
Peripheral Interface (SPI), I2C, Special optimiSed Screen Interface (SoSSi) for LCD Driver, and
General Purpose Input-Output (GPIO). Devices that interfaces with OMAP through these lines
includes the Frequency Pot, A/D converter for volume control, ATMEL ATTiny13 for power control
functions, TPS65012 (U2100) for OMAP Power Management Control and the Solomon SSD LCD
Driver.
Input from the user through the GCAI Accessory Interface, Keypad presses; Volume and Frequency
knobs are received by the OMAP processor and sent back to the transceiver PATRIOT
microprocessor for the processing. The information would be relayed back to the user through the
LCD Display.
The ARM core of the processor requires two clocks for proper operation. A 12 MHz crystal (Y1001) is
provided at pin Y2 and pin W3 of OMAP IC. The processor has the capability of running at higher
clock rates, which are programmable and based on the 12 MHz reference.
June 15, 2005
LED
INDICATORS
ATTINY13
POWER
CONTROL
CIRCUIT
4
3
Q4100
5
R4103
R2120
4
3
Q4101
5
R4104
R2119
C2309
U3103
4
3
R2304
3
Q4102
5
2
2
C3105
C2308
3
R4105
R2118
R2311
TP_PB3
R1012
C1004
C2314
4
3
4
C2305
5
C1036
5
U2303
C2316
C2315
R2313
3 4
U2302
U2304
5
8
C2318
R1018
R1017
C2317
R2319
C1033
C2319
C2320
R1021
R2316
Y1000
Q2306
R2318
C1001
C1002
Q2310
C2311
R2300
R2325
R2303
C2321
C2301
S4103
S4101
S4100
32KHz
OSCILLATOR
CIRCUIT
Theory of Operation: Controller Section
8MB SDRAM
OMAP IC
2MB FLASH
C1307
F1
FLASH_CLK
C1305
TP_12V
U1301
R1311
C1304
R1313
C1306
R1312
A8
F8
R1037
R1310
R1062
C1024
C1014
AA1
C1019
A9
J9
C1021
C1302
C1012
C1022
R1067
C1303
C1010
C1018
U1300
U1000
C1016
C1300
R1034
C1008
C1023
C1301
C1000
A1
J1
C1006
BCLK
AA21
A21
R1302
R1070
TP_SDRAM_ADD_13
SH1000
S4102
S4105
S4104
FREQ. KNOB
R2117
R2138
R2137
R2135
R2136
R2126
5
R2100
3 4
C2110
D4107
R4110
S4107
S4106
R4109
BACKLIGHT
CIRCUIT
6815854H01-A
S4108
1
D4108
1
R4106
Q4103
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