Subsystem (Msm77); Arm Microprocessor Subsystem - LG -P970 Service Manual

3.9 Subsystem(PMB9801_X-GOLD

3.9.1 ARM Microprocessor Subsystem

The ARM1176JZ-S incorporates an integer unit that implements the ARM11 ARM architecture v6. The core
supports the 32-bit ARM and 16-bit Thumb instruction sets, Jazelle technology to enable direct execution of Java
byte codes and a range of SIMD DSP instructions that operate on 16-bit or 8bit values in 32-bit registers.
3.9.2 WCDMA Subsystem
The 3.5G cellular modem is implemented as an independent Layer1 subsystem including a separate
microcontroller. The X-GOLDTM616 Modem core acts as a master controlling the 3.5G cellular Modem slave via
the Layer1 host controller interface.
The 3.5G cellular modem consists of a number of superblocks.All higher rate physical layer data connections are
realized by a dedicated bus system using dedicated soft bit RAM (SBRAM) blocks serving as data buffers in
between the inner receiver (IRX) and outer receiver (ORX) peripherals for UMTS and HSDPA demodulation and
channel decoding. The AHB buses are mainly used for configuring the HW peripherals and collection of
measurement results and reportings of the peripherals by the 3G modem controller:
The individual superblocks are:
• SB_COM: including
– The communication RAM (COMRAM) for HCI command exchange and physical layer data exchange in both
3.5G transmit and receive direction
– Buffering of communication flags, implementing the notification mechanism between host and 3G modem
controller based on interrupts in both directions
– RLC (radio link control)/MAC (medium access control) accelerators (MACPHY-UL and MACPHY-DL) supporting
the data processing of the Layer 2 protocol stack entities RLC and MAC in both uplink and downlink direction
– Access to the crossbar via the 3G_Master interface and the multi master AHB_3G_MASTER bus. The MACPHY
units have master access to the crossbar via the 3G_MASTER master interface. The 3G_Master
interface can also be accessed from the ARM7 via an AHB2AHB bus bridge connected to the AHB_3G_SYS
bus.Simple round robin arbitration of AHB_3G_Master between the three masters is implemented.
– Access from the crossbar via the 3G_MACOM slave interface
– Access from the 3G modem controller subsystem via the 3G_MEMIF bus
LGE Internal Use Only
616)
TM
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3. TECHNICAL BRIEF
Only for training and service purposes