LG L240 Service Manual page 22

ULPDR
GSM_clock_13M
GSM_clock_26M
MPU public
TIPB
DSP
shared
TIPB
ARMPER_CK
CLKM1
This implementation is based on the following:
- The time processing unit (TPU) module is a real-time sequencer dedicated to monitoring GSM
baseband processing.
- The serial port of the time serial port (TSP) module controls both interfaces.
- The real-time TSPACT signal of the TSP module
- The McBSP digital RF module is used for the six-wire data interface.
- The serial radio interface module is used for the two-wire data interface.
- A system clock interface receives a squared 26-MHz clock from the RF IC.
3.3.4 SIM interface
SIM interface scheme is shown in below.
SIM_IO, SIM_CLK, SIM_RST, SIM_PWRCTRL ports are used to communicate DBB via ABB with
plugged sim card and the LDO (VRSIM) in ABB enables operate 1.8V to 2.5V to search SIM card
OMAPV1030 Radio I/F
TPU
TPU BUS
TSPCLK
TSPEN
TSPDO
TSPDI
TSP
TSPACT3
I/O
TSPACT4
CORE
TSPACT5
MUX
CLKR
DR
FSR
McBSP
digital
RF
CLKX
DX
FSX
PIRXEN
POTXEN
Serial
PODIGRFDO
Radio
IF
PIDIGRFDI
PICLKM
<Fig.8> OMAPV1030 Radio Interface
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3. Circuit Description
OMAPV1030 device
digitalrf_rf_clk
RF CTRL IF
digitalrf_rf_cs
digitalrf_rf_data
RF real-
digitalrf_tx_start
time IF
digitalrf_enr
digitalrf_rxen
digitalrf_rx_clk
digitalrf_rx_data
digitalrf_rx_cs
digitalrf_tx_clk
RF DATA IF
digitalrf_tx_cs /
digitalrf_enable
digitalrf_tx_data /
digitalrf_data
digitalrf_sysclk