3.8 Subsystem(MSM6250A)
3.8.1 ARM Microprocessor Subsystem
The MSM6250A device uses an embedded ARM926EJ-S microprocessor. This microprocessor,
through the system software, controls most of the functionality for the MSM, including control of the
external peripherals such as the keypad, LCD, RAM, and ROM devices. Through a QUALCOMM
proprietary serial bus interface (SBI) the ARM926EJ-S configures and controls the functionality of the
RTR6250, RFR6200, RFL6200, and PM6650-2 devices.
3.8.2 UMTS Subsystem
The UMTS Subsystem performs the digital UMTS signal processing. Its components include:
• Searcher engine
• Demodulating fingers
• Combining block
• Frame deinterleaver
• Viterbi decoder
• Up-link subsystem
• Turbo decoder
On the down-link channel the UMTS subsystem searches, demodulates, and decodes incoming
CPICH, CCPCH, SCH, and Traffic Channel information. It extracts packet data from the downlink
traffic channel and prepares the packet data for processing. For the up-link, the CDMA subsystem
processes the packet data and modulates the up-link traffic channel (DCH).
3.8.3 GSM Subsystem
The GSM Subsystem performs the digital GSM signal processing.
3.8.4 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.
3.8.5 Serial Bus Interface(SBI)
The MSM6250A device’s SBI is designed specifically to be a quick, low pin count control protocol for
QUALCOMM’s RTR6250, RFR6200, RFL6200, and PM6650 ASICs. Using the SBI, the RTR6250,
RFR6200, RFL6200, and PM6650 devices can be configured for different operating modes and for
minimum power consumption, extending battery life in Standby mode. The SBI also controls DC
baseband offset errors.
3. TECHNICAL BRIEF
- 38 -
Summary of Contents for U890
Page 1: ...Date April 2006 Issue 1 0 Service Manual Model U890 U890c Service Manual U890 U890c ...
Page 3: ... 4 ...
Page 20: ...3 TECHNICAL BRIEF 21 ...
Page 46: ...3 TECHNICAL BRIEF 47 Figure PM6650 2 Functional Block Diagram ...
Page 70: ...4 TROUBLE SHOOTING 71 4 2 SIGNAL PATH ...
Page 109: ...4 TROUBLE SHOOTING 110 CN600 50pin LCD connector CN901 C907 C911 FB901 FB902 ...
Page 115: ...4 TROUBLE SHOOTING 116 C226 C227 for MIC serial capacitor ...
Page 118: ...4 TROUBLE SHOOTING 119 Q400 Q401 Q402 VBATT GND ...
Page 139: ...Table 2 1 1 RF Block Component 6 BLOCK DIAGRAM 140 ...
Page 140: ...6 BLOCK DIAGRAM 141 6 2 Interface Diagram U890 Interface Diagram ...
Page 142: ...6 BLOCK DIAGRAM 143 Top Side ...
Page 143: ...6 BLOCK DIAGRAM 144 Bottom Side ...
Page 152: ... 153 8 pcb layout ...
Page 153: ... 154 8 pcb layout ...
Page 154: ... 155 8 pcb layout ...
Page 155: ... 156 8 pcb layout ...
Page 156: ... 157 8 pcb layout ...
Page 157: ... 158 8 pcb layout ...
Page 163: ...9 CALIBRATION 164 9 3 HOT KIMCHI Example Choose_U890 ...
Page 164: ...9 CALIBRATION 165 Click APPLY button Click START button ...
Page 165: ...9 CALIBRATION 166 Click Run button to lunch RF AUTOTEST ...
Page 167: ... 168 ...
Page 191: ...Note ...
Page 192: ...Note ...