LG -P970 Service Manual page 50

• SB_ORX: including
– The SBRAM1 performing framewise storage of the demodulated coded composite transport channels via the
dedicated bus system
– The SBRAM2 performing TTI wise storage of the demodulated transport channels via the dedicated bus system
– The R99-ORX (Outer Receiver) HW peripheral performing transport channel demultiplexing, de-rate
matching and channel decoding of all UMTS downlink physical channels
– Configuration access from the 3G modem controller subsystem via the AHB_3G_L1 AHB bus
– Access to write decoded transport
• SB_HSDPA: including
– The HSDPA-IRX inner receiver HW peripheral performing demodulation of HS-PDSCH and demodulation and
decoding of HS-SCCH HSDPA physical channels
– The SBRAM3 performing framewise storage of the demodulated coded composite transport channels via the
dedicated bus system
– The SBRAM4 performing TTI wise storage and HARQ (hybrid ARQ) buffering via the dedicated bus system – the
HSDPA-ORX (Outer Receiver) HW peripheral performing transport channel demultiplexing, de-rate matching,
HARQ processing and channel decoding of all UMTS downlink physical channels
– Configuration Access from the 3G modem controller subsystem via the AHB_3G_L1 AHB bus
– Access to write decoded transport blocks into the COMRAM via the dedicated bus system
• SB_DIGRF: including
– The DigRF interface (compliant with DigRF Interface V3.09), which is used to transfer the complete 3.5G and
2.5G GSMEDGE data and control information for both receive and transmit direction using the DigRF V3.09
packet structures from X-GOLD™618 to suitable RF transceiver ICs
– Access from AHB_3G_Shared which is a multi master AHB bus shared between host controller and 3G modem
controller. The access must be shared since both controllers need configuration access e.g. for writing control
sequences, and reading status information from the 2G and 3G RF transceivers. Master access from the 3G
modem controller subsystem is provided via an AHB2AHB bridge. Master access from the ARM11 side is
provided via the 3G_MACOM crossbar interface and an AHB2AHB bridge. Simple round robin arbitration of
AHB_3G_Shared is implemented
– Access from the 2G side for 2G data read and write access to and from the RF side
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3. TECHNICAL BRIEF
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