Texas Instruments TMS320DM355 warranty ARM Subsystem Overview, Components of the ARM Subsystem

TMS320DM355

Digital Media System-on-Chip (DMSoC)

www.ti.com

SPRS463A –SEPTEMBER 2007 –REVISED SEPTEMBER 2007

3 Detailed Device Description

This section provides a detailed overview of the DM355 device.

3.1 ARM Subsystem Overview

The ARM Subsystem contains components required to provide the ARM926EJ-S (ARM) master control of the overall DM355 system, including the components of the ARM Subsystem, the peripherals, and the external memories.

The ARM is responsible for handling system functions such as system-level initialization, configuration, user interface, user command execution, connectivity functions, interface and control of the subsystem, etc. The ARM is master and performs these functions because it has a large program memory space and fast context switching capability, and is thus suitable for complex, multi-tasking, and general-purpose control tasks.

3.1.1Components of the ARM Subsystem

The ARM Subsystem in DM355 consists of the following components:

∙ARM926EJ-S RISC processor, including:

–coprocessor 15 (CP15)

–MMU

–16KB Instruction cache

–8KB Data cache

–Write Buffer

–Java accelerator

∙ARM Internal Memories

–32KB Internal RAM (32-bit wide access)

–8KB Internal ROM (ARM bootloader for non-AEMIF boot options)

∙Embedded Trace Module and Embedded Trace Buffer (ETM/ETB)

∙System Control Peripherals

–ARM Interrupt Controller

–PLL Controller

–Power and Sleep Controller

–System Control Module

The ARM also manages/controls all the device peripherals:

∙DDR2 / mDDR EMIF Controller

∙AEMIF Controller, including the OneNAND and NAND flash interface

∙Enhanced DMA (EDMA)

∙UART

∙Timers

∙Real Time Out (RTO)

∙Pulse Width Modulator (PWM)

∙Inter-IC Communication (I2C)

∙Multi-Media Card/Secure Digital (MMC/SD)

∙Audio Serial Port (ASP)

∙Universal Serial Bus Controller (USB)

∙Serial Port Interface (SPI)

∙Video Processing Front End (VPFE)

– CCD Controller (CCDC)

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