TMS320DM355 datasheet(85/158 Pages) TI

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Boot

mode

Reset

Boot

mode

Bootfrom

NANDflash

InternalROM

BootOK?

Yes

Bootfrom

UART

Bootfrom

MMC/SD

BootOK?

Yes

Invokeloaded

Program

Invoke

OneNAND

Yes

3.13 Power Management

TMS320DM355

Digital Media System-on-Chip (DMSoC)

SPRS463B – SEPTEMBER 2007 – REVISED OCTOBER 2007

• ARM ROM Boot - UART mode

–

No support for a full firmware boot. Instead, loads a second stage user boot loader (UBL) via UART

to ARM internal RAM (AIM) and transfers control to the user software.

–

Support for up to 30KB UBL (32KB - ~2KB for RBL stack)

The general boot sequence is shown in Figure 3-6. For more information, refer to the ARM Subsystem

User's Guide.

Figure 3-6. Boot Mode Functional Block Diagram

The DM355 is designed for minimal power consumption. There are two components to power

consumption: active power and leakage power. Active power is the power consumed to perform work and

scales with clock frequency and the amount of computations being performed. Active power can be

reduced by controlling the clocks in such a way as to either operate at a clock setting just high enough to

complete the required operation in the required timeline or to run at a clock setting until the work is

complete and then drastically cut the clocks (e.g. to PLL Bypass mode) until additional work must be

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TMS320DM355 Datasheet(PDF) 85 Page - Texas Instruments

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