Subsystem(Msm6280) - LG U970 Service Manual

3.8. Subsystem(MSM6280)

3.8.1. ARM Microprocessor Subsystem
The MSM6280 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, SDRAM, and NAND-Flash devices. Through a
QUALCOMM proprietary serial bus interface (SBI) the ARM926EJ-S configures and controls the
functionality of the RTR6275, RFR6275 and PM6650 devices.
3.8.2. WCDMA R99 features
The MSM6280 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)
3.8.3. HSDPA features
The MSM6280 device supports the HSDPA release 5 standard:
• Supports HS-DSCH (HS-SCCH, HS-PDSCH and HS-DPCCH) in addition to the R99 transport
channels as defined in 3GPP specifications.
• Supports a maximum of four simultaneous HS-SCCH channels as defined in 3GPP specifications.
• Supports a maximum of 10 HS-PDSCH channels and supports both QPSK and 16 QAM modulation.
It supports UE category 6 in SW release 2.0 and category 8 in SW release 4.0.
• Supports CQI, and ACK/NACK on HS-DPCCH channel as defined in 3GPP specifications.
• Supports all incremental redundancy versions for HARQ, as defined in 3GPP specifications.
3. TECHNICAL BRIEF
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