LG U8110 Service Manual page 22

3. TECHNICAL BRIEF
C. Peripheral Hardware Subsystem
There are 29 peripherals within the peripheral hardware subsystem. With the exception of the USB,
all hardware peripheral blocks are APB slave peripherals. From an architecture-hierarchy perspective,
the SYSCON block is an APB slave on the slow APB bridge, but resides at the top level of the ASIC.
The APB provides a simple interface to support low-performance peripherals.
Within the peripheral subsystem, there are four separate APB busses with AHB to APB (AHB2APB)
bridges to the multi-layer AHB.
D. DSP Hardware Subsystem
The DSP subsystem provides support for processor intensive activity, such as voice coding and
multimedia application support. The DSP subsystem includes the standard C55xTM Core (LEAD3)
from Texas Instruments with associated memory system and peripherals.
E. GAM Hardware Subsystem
The Graphics Accelerator Module (GAM) subsystem provides hardware support in the creation of
visual imagery and the transfer of this data to the display. GAM also provides support for the camera
module. The visual data could be graphics, still images or video.
The GAM subsystem consists of five modules:
• GRAM - graphics memory (160 kB).
• GAMCON . GAM controller.
• GRAPHCON . graphics controller.
• PDI/SSI - programmable display interface for parallel/serial displays.
• CDI - camera data interface.
F. GSM Hardware Subsystem
The GSM subsystem is a stand-alone sub-chip incorporating GSM modem and interface to GSM radio
together with memory control (MEMSYS) and internal RAM (IRAM).
The hardware peripheral blocks are RXIF, FCHDET, CRYPTO, EQU, NODI, 4 x CHD, GPRS
CRYPTO, GPRS CRC24, CHE, DIRMOD, CLKCON, SERCON, TIMGEN, MEMSYS and IRAM.
The peripherals are accessible to the AHB (CPU-only) by an asynchronous I/O bridge.
The dual port IRAM is accessible to the AHB (CPU and DMA) by a synchronous AHB slave interface.
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