Only For Training And Service Purposes - LG GD580 Service Manual

B. CPU Subsystem
- Access CPU subsystem
The digital baseband controller includes an access CPU subsystem, which includes the sub
modules 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
sub modules 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 mega cell, 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 mega cell, the DSPSUB includes external memories, peripheral units, and
interfaces. The DSP mega cell 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.
Copyright © 2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

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3. Technical brief
LGE Internal Use Only