Only For Training And Service Purposes - LG AT&T GR500 Service Manual

3. TECHNICAL BRIEF
B. CPU Subsystem
- Access CPU subsystem
The digital baseband controller includes an access CPU subsystem, which includes the submodules
described below.
• 32 KiB I-cache
• 16 KiB D-cache
• Page table
• Memory Management Unit (MMU)
• JTAG
• ETM9
• 26 KiB I-TCM
• 8 KiB D-TCM
- Application CPU subsystem
The digital baseband controller includes an Application CPU subsystem, which includes the
submodules described below.
• 32 KiB I-cache
• 16 KiB D-cache
• Page table
• MMU
• JTAG
• ETM9
• 8 KiB I-TCM
• 8 KiB D-TCM
C. Peripheral Hardware Subsystem
The digital baseband controller includes hardware that supports mobile terminal peripherals
such as a MMC, SD, UART, I2C, USB, keypad, and infrared. Collectively, this hardware
comprises the Peripheral subsystem.
The functional blocks of the Peripheral subsystem connect to the peripheral bus through four
separate bridges, which provide a simple interface to support different timing and memory
access arrangements.
D. DSP Hardware Subsystem
The Digital Signal Processor Subsystem (DSPSUB) includes a DSP megacell, which contains the DSP
CPU together with a tightly coupled memory. The DSP is the Ceva-X 1620 core with a 64 kB
instruction RAM and a 64 kB data RAM. It also contains debug logic and interfaces. In addition to the
megacell, the DSPSUB includes external memories, peripheral units, and interfaces. The DSP
megacell is clocked at 208 MHz.
The DSPSUB includes an AHB master and an AHB slave interface. The AHB master provides a direct
access to the Internal Random Access Memory (IRAM) in the EGG core through the AHB. The AHB
slave interface allows the CPU and the DMA to access in the program and data RAM residing in the
DSPSUB.
E. XGAM Subsystem
The XGAM subsystem is a graphics acceleration module that provides hardware support in the
creation of visual imagery and the transfer of this data to a display. The XGAM also provides support
for connecting a Camera module. The visual data could be graphics, still images, or video.
The XGAM subsystem is handled and provided by Ericsson.
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Only for training and service purposes