Ultra Low Power DSP Advantage

From Texas Instruments Embedded Processors Wiki

Contents 1 C5515 Power Comparison of C55x with nearest DSP Competitor 2 Low Power Considerations for C55x 2.1 Tips for getting into low power state 2.2 Low power and Code Composer Studio 3 Power comparison between C55x devices

C5515 Power Comparison of C55x with nearest DSP Competitor

Power consumption for 75%Dual-MAC + 25% Add routine for CPU core + memory + PLL

Battery life comparison is for 75%Dual-MAC + 25% Add routine for CPU core + memory + PLL. The bar in blue indicates the battery life for 128kbps, 44.1 KHz, Stereo MP3 decode on C5515.

Low Power Considerations for C55x

The 55x DSP is known for its low power consumption.

Tips for getting into low power state

There are a few common things to remember

• If you put the SDRAM in a self-refresh state you can then idle the EMIF. More documentation on this subject can be found in section 3.9.3.2 of the EMIF Reference Guide.
• If you have an emulator connected to your board then you will not be able to idle the CPU.
• Make sure that no interrupts are pending in IFR0/IFR1 when you try to idle the CPU. You can clear pending interrupts by writing 0xFFFF to IFR0/IFR1.
• Low Power RTC mode

Also, check out this article from EE Times.

Low power and Code Composer Studio

• C55x cores which do not have ICEpick will have the CPU clocked while the debugger is connected. Run-Free mode will disconnect CCS, but does allow the CPU to run without acknowledging debug halt events. This does not prevent IDLE as the debug logic supports this.

Power comparison between C55x devices

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