User's Manual

VS500 USER MANUAL
Confidential & Proprietary of VACOM 6/13 Page Date : 05-08-08, Rev No : 1.0
Control No.: MSD351A0VS500
Originated by Hard Ware 3 Team
3.2.1 CIRCUIT DESCRIPTION
a. MSM6000: MSM6000 is a chipset responsible for User Interface, RF Interface, Digital Interface
and especially for base-band digital signal processing of CDMA/FM.
b. FLASH MEMORY / SRAM: FLASH MEMORY & SRAM is for storing operation program,
system parameters and additional parameters to manage handset. And it is a temporally place to
preserve all system parameters and data related with Base Station.
c. Power Management : Basically it supplies controllable regulated powers to each parts for handset
operation and offers charging control function for battery in the meaning of power management
And it also conducts functions such as clock buffer, driver circuit for UI, sensor of initial power
ignition.
d. Audio amplifier / Audio Interface: Audio signal for indicating notice of incoming calls needs to be
amplified by audio AMP for noticeable sounds. Voice or key sounds are inputted directly to speaker
from audio AMP output of MSM.
e. KEY PAD / LCD MODULE: These are interface parts between user and the handset like sensing of
key pressing and displaying of handset states.
f. IO Connector : It offers physical connectivity for data communication and Diagnostic Monitor
using RS232C protocol, and external power from charger or Level Translator circuit for test.
3.2.1.1 MOBILE SYSTEM MODEM – MSM6000
MSM6000 is a core component including ARM7TDMI CPU core for CDMA type cellular phones. It has
208 BALL FBGA package type and handles signals from RF, Digital and user action
a. Clock Interface (reference clock / 19.2MHz, Input) : It is the interface and processing part of
19.2MHz clock signal from VC-TCXO Crystal Oscillator, reference signal for all of clock regime
b. Reset Interface: It makes RESET signal for CPU reset at power on
c. Microprocessor Interface: It stands for embedded ARM CPU core in MSM6000 and its interface. It
consists of CPU interface for memories or devices which need CPU control such as Flash/RAM,
EEPROM, LCD and others. Address Bus(A1-A20) is for addressing to memory space of each
device to forward or receive data. Data Bus(D0-D15) is the path for forwarding the data to devices
or receiving the data from devices. And also there are signals to control data flows between device
and CPU like RAM_CS, ROM_CS, LCD_CS, GP_CS, HWR_N, LWR_N and so on.
d. CODEC (Coder/Decoder) Interface: MSM6000 has a Voice Band Audio CODEC and provides
Receiver/C-Mic, Hands-Free, Ear Phone Interface through 3pairs of embedded audio AMPs.
e. UART (Universal Asynchronous Receiver Transmitter) Interface: It is the RS-232 protocol
interface for diagnosis of handset or data communication with PC. And it consists of UART1 and