Subsystem(Msm6280) - LG KB770 Service Manual

3. TECHNICAL BRIEF

3.7. Subsystem(MSM6280)

3.7.1. 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.
3.7.2. 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)
3.7.3 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.
■ Can switch between HS-PDSCH and DPCH channel resources, as directed by the network.
■ Can be configured to support any of the two power classes 3 or 4 as defined in 3GPP R5
specifications (25.101).
■ Supports network activation of compressed mode by SF/2 or HLS on the DPCH for conducting
inter-frequency or inter-RAT measurements when the HS-DSCH is active.
■ Supports STTD on both associated DPCH and HS-DSCH simultaneously.
■ Supports CLTD mode 1 on the DPCH when the HS-PDSCH is active.
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