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USB I/F
UART3 I/F
IRDA_SD
SD/MMC I/F
SD_SW1
VSIM1
Application
Proccessor
UART1
IPC_GPIO
AP_CLK_REQ
LOW_PWR
McBSP1
McBSP2
AP_RST
RST_OUT
AP_WAS_RSR
UART2
4.5. Modem
4.5.1. Base-Station Synchronisation & AFC
The Modem attempts to locate valid network service by monitoring the received RF signals to "camp-on" an available network.
In this "Idle" mode the Modem only receives at precise intervals (paging channel time slots), listening for incoming voice calls
and data packets; at all other times the Modem RF sub-system is powered-down to conserve battery life.
The base-station network signals to the Modem the exact intervals at which any incoming transmission may be expected.
Frequency tuning (channel selection and frequency-drift correction) is achieved by the Automatic Frequency Control system
by slightly adjusting the frequency of the 26 MHz Voltage-Controlled Temperature-Compensated Crystal Oscillator (the
VCTCXO is located in the RF section and not shown in the block diagram above). The VCTCXO is the master clock reference
from which the RF frequencies are generated and most of the Modem logic is clocked, and is located in the RF section of the
design, having the part reference Y500.
PROVISIONAL ISSUE
USART0
IrDA
VLSD
SD Card
FLASH
EBU I/F
(CS0,CS1)
4MB
SRAM
1MB
CC_VZ_N
VSIM_SW
SIM I/F
SIM
OP_DET
CC0CC4 IO
Flip Sensor
(KP_IN4)
Proccessor
UART1
KP_OUT2
CC2CC3IO
IPC
I2S2
SSC0
CLKOUT1
VDD_RTC2
32KHz
RTC
32KHz
CLK32K
GPIO86
POAKOUT1
EINT0
KP_IN0
Figure 4.5: Baseband Block Diagram
CC1CC4IO
PWM_MAIN
DIF_D4
CC1CC0IO
PWM_SUB
DIF_D3
CC1CC2IO
PWM_FLASH
SOAKOUT0
VI NT
ON
VBATT
M8
CURRENT
M9
BATT_TEMP
M2
RF_TEMP
M1
CIC_IRQ
DIF_D5
LOW_PWR
MICP2/N2
EPREF
EPPA1/2
MICP1/N1
HH MIC
EPP1/N1
HH SPK
Modem
I2C
Vmain
ON
RTCONT
PM_INT
NRESET
LRF3_EN
VCXO_EN
RF I/F
F26M
/HS_DET
KP_IN6
HS_SND_END
BT_CLK_PU
BT_RST
I2S1
– 4-6 –
USB
UART3
I/O CN
USART0
VDCDC
VBATT
Vmain
VDD_RTC2
COMPANION
VLSD
IC
VLBB3
HS_MIC
Mono HS
HS_SPK
HS_SND_END
/HS_DET
BATT_TEM
Battery
HF SPK
840 mAh
VBUS
EXT_PWR
PMIC
VIB
M
SLED1
SLED2
LED
VRF1
VRF2
VRF3
RF_TEMP
VRF2
BT_CLK
BT_CLK_REQ
Bluetooth
EXT_PWR
VACC
VBUS
VBATT
VACC
Vmain
Paging LED
Alert LED
Keypad LED
VRF1
VRF2
RF
VRF3
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