Texas Instruments TMS320DM355 사용자 설명서
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PRODUCT PREVIEW
Boot
mode
?
Reset
Boot
mode
?
Boot from
NAND flash
Internal ROM
Boot OK ?
No
Yes
Boot from
UART
Boot from
MMC/SD
Boot OK ?
Boot OK ?
Yes
No
Invoke loaded
Program
Invoke
OneNAND
No
Yes
3.13 Power Management
TMS320DM355
Digital Media System-on-Chip (DMSoC)
SPRS463A – SEPTEMBER 2007 – REVISED SEPTEMBER 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.
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
. For more information, refer to the ARM Subsystem
User's Guide.
Figure 3-6. Boot Mode Functional Block Diagram
The 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 performed. Leakage power is due
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 performed. Leakage power is due
Detailed Device Description
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