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DM8148 EVM DSP frequency problem

Abhishek Singh Sisodia
Intellectual 535 points

Hi

I am using Mistral Revision C TI DM8148 EVM board. For the board, i am using the GEL file( TI8148_EVM Gel) specified in the following post http://e2e.ti.com/support/embedded/bios/f/355/t/153410.aspx#555612 . However, Using one of the test programs i have observed that my DSPclock is running at 500 Mhz in contrast with one specified in TI8148 data sheet which is 750 Mhz.

I think it is because of the GEL file i am using. Can you please tell me how to scale it up so that my DSPcan run at 750 Mhz clock as per the datasheet.

Secondly, i am using TSCL counter as mentioned here for profiling.

http://processors.wiki.ti.com/index.php/Porting_GPP_code_to_DSP_and_Codec_Engine#Benchmark_Code_on_DSP_using_the_Time_Stamp_Counter_.28TSC.29

So if my CPU runs at 750 Mhz from 500 Mhz then will TSCL count increase or decrease? I think it will be constant since it just measures the cycles and is independent of clock.

Please clarify on this.

Thanks and Regards

Abhishek

  • 0
    TI__Genius 15310 points

    Abhishek,

    Please refer to the Table 7-4. Device Operating Points (OPPs) in Data sheet.  The 750 MHz DSP is for OPP166 part and yours is probably the OPP100 part.  Please contact our local FAE for the part that support OPP166.

    BR,

    Viet