LG -P970 Service Manual page 55

3. TECHNICAL BRIEF
• The Equalizer Accelerator is used to speed up the viterbi trellis search in the equalizer
• The Channel Decoder Accelerator is used to speed up the viterbi trellis search in the channel decoder
• The DigRF RX block is the interface for receiving samples from the RF
• The DifRF TX block is the interface for transmitting samples to the RF
• The GSM Cipher is used for encrypting and decrypting data in circuit switched calls
• The IR memory is needed for storing incremental redundancy data in a EGPRS call
• The shared memory is used to exchange data and control information between DSP and ARM
• The AFC is used for controlling the (external) VCXO in the frequency control loop
• The GSM system interface is used to program the timing of all GSM related signals
• The GPRS GEA Kasumi is used for encrypting and decrypting data in packet switched calls
• The USIM is the SIM card interface
3.9.4 RF Interface
The RF interface communicates with the mobile station's external RF and analog baseband circuits. Signals to
these circuits control signal gain in the Rx and Tx signal path and maintain The system's frequency reference.
3.9.5 SPI based IPC
The XMM™6160 platform supports the serial connection via SPI. The command flow of the IPC is independent
from the HW solution and the IPC protocol. It is implemented using a logical channel multiplexer and AT
commands.
The IPC hardware interface consists of a serial SPI interface and two control signals, and one additional optional
control signal. The SPI is implemented using the USIF2 of the X-GOLD™616, with the GPIO's implementing sleep
mode and readiness handling
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