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VX8560
2.3.4 Memory Part
MCP contents 2Gbits NAND flash memory and 1Gbits DDR SRAM. In the Flash Memory part of MCP are programs
used for terminal operation. The programs can be changed through down loading after the assembling of terminals.
On the SDRAM data generated during the terminal operation are stored temporarily.
2.3.5 Power Supply Part
When the battery voltage (+4.0V) is fed and the PWR key of keypad is pressed, the power-up circuitry in PM (power
management) circuit(in QSC6075) is activated by the PWR_ON_SW/ signal, and then the LDO regulators embedded
in PM circuit are operated and +1.3V_MSMC, +2.6V_MSMP, +1.8V_MSME and +2.1V_MSMA are generated.
The Rx part (+2.1V_RFRX) and Tx part voltage (+2.1V_RFTX) are regulated by QSC607 5
2.3.6 Logic Part
The logic part consists of internal CPU of QSC, RAM, MCP. The QSC6075 receives TCXO (=19.2MHz) from X101
and controls the phone in both CDMA and GPS modes. The major components are as follows:
CPU
The ARM926 EJS microprocessor includes a 3 stage pipelined RISC architecture, both 32-bit ARM and 16-bit
THUMB instruction sets, a 32-bit address bus, and a 32-bit internal data bus. It has a high performance and low
power consumption.
LG Electronics Inc.
QSC6075
MIC1
MIC2
EAR2
EAR1
SPKR_OUT
[Figure 2-2] Block Diagram of Digital/Voice Processing Part
Mic
Ear- Mic
Receiver
Speaker
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