Subsystem(Msm6245) - LG U250 Service Manual

3.8 Subsystem(MSM6245)

3.8.1. ARM Microprocessor Subsystem
The MSM6245 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, ROM, and EEPROM devices. Through a Generic
single-wire serial bus interface (SSBI) the ARM926EJ-S configures and controls the functionality of the
RTR6275, RFR6275 and PM6650 devices.
3.8.2. WCDMA R99 features
The MSM6245 device supports release 99 June 2004 of the W-CDMA FDD standard, including the
following features:
■ All modes and data rates for W-CDMA frequency division duplex (FDD), with the following
restrictions:
❏ The downlink supports the following specifications:
- Up to four physical channels, including the broadcast channel (BCH), if present
- Up to three dedicated physical channels (DPCHs)
- Spreading factor (SF) range support from 4 to 256
- The following transmit diversity modes are supported:
❏ Space time transmit diversity (STTD)
❏ Time-switched transmit diversity (TSTD)
❏ Closed-loop feedback transmit diversity (CLTD)
■ The uplink supports the following specifications:
❏ The uplink provides the following UE support:
- One physical channel, eight TrCH, and 16 TrBks starting at any frame boundary
- A maximum data rate of 384 kbps
❏ Full SF range support from 4 to 256
■ SMS (CS and PS)
■ PS data rate - 384 kbps DL / 384 kbps UL
■ CS data rate - 64 kbps DL / 64 kbps UL
■ AMR (all rates)
3. TECHNICAL BRIEF
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