Technical Brief; Digital Baseband(Dbb) & Multimedia Processor - LG GD580 Service Manual

3. Technical brief

3. Technical brief
3.1 Digital Baseband(DBB) & Multimedia Processor
3.1.1 General Description
• Access subsystem
- Access Central Processing Unit (CPU) subsystem – ARM926, Joint Test Action Group (JTAG),
Embedded Trace Module (ETM), Instruction and Data (I&D)-cache, and I&D-TCM
- Access peripheral subsystems – Subscriber Identity Module (SIM) interface, IrDA®, Universal Serial
Bus (USB), Universal Asynchronous Receiver/Transmitter (UART), and so on
- Digital Signal Processor (DSP) subsystem – CEVA-X1620, JTAG, Static Random Access Memory
(SRAM), and Program Data Read Only Memory (PDROM)
- EDGE/GSM/GPRS (EGG) subsystem – EGG hardware accelerators
- WCDMA subsystem – WCDMA hardware accelerators
• Application subsystem
- Application CPU subsystem – containing ARM926, JTAG, ETM, I&D-cache, and I&D-TCM
- Application peripheral subsystems – I2C™, keypad, UART, and so on
- Graphics subsystem – XGAM subsystem
- Audio Processing Execution (APEX) and video encoder subsystems
In addition to the two subsystems above, there is also a test block, chip control block, and
a pad multiplexing block residing at the top level
DSP
- 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.
WCDMA subsystem
- The digital baseband controller WCDMA subsystem incorporate a WCDMA modem
- An interface to the WCMDA together with memory control and an internal single port
RAM. The WCDMA subsystem has three AHB slave interfaces.
- The Ericsson DB 3150 also includes HSDPA class 6 functionality.
- The WCDMA subsystem is handled and provided by Ericsson.
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.
Operation and Services
- I²C™ Interface
- SIM Interfaces
- General Purpose I/O (GPIO) Interface
- External Memory Interface that supports NAND, NOR, PSRAM, SDRAM,
- JTAG
- RTC
- ETM (in Prototype Package)
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Only for training and service purposes