AM3715 working frequency

Hi David,

We only test at the supported operating performance points (OPPs): 1Ghz, 800MHz, 600MHz and 300MHz. The OPPs are carefully chosen to maximize performance for each device such as the AM3715. Due to amount of testing required to support Dynamic Voltage and Frequency Scaling (DVFS) and Adaptive Voltage Scaling (AVS), it is necessary to keep the number of OPP's to a manageable size.

thank  you , Jeff.

Hi Jeff,

How to test AVS?

I can watch DVFS result, that is different frequency to different voltage levels. But I did not see AVS result. When it is effective, the voltage should also change.Right?

Hi David,

Are you using TI Linux PSP ?

If so, you need to enable SmartReflex AVS in Linux kernel configuration.

http://processors.wiki.ti.com/index.php/UserGuidePowerMgmt_PSP_03.00.00.05#SmartReflex

You also need to enable it from software after you boot the processor.

http://processors.wiki.ti.com/index.php/UserGuidePowerMgmt_PSP_03.00.00.05#SmartReflex_2

Thanks, Kazunobu,

I'm using Windows Mobile 6.5. I guess I have to do the samething with Linnux PSP.

The SmartReflex driver might be already available in WinCE BSP from TI so you may want to check it if you can use it or reference to it. 

Thanks,

How to test the result? I can watch the DVFS result by Scope to see the deferent votage and I can display the frequency by LCD. But I can't see any AVS result.If AVS is enabled, It should have voltage change on Core_Vdd1 and Core_Vdd2. Right?

You can monitor VDD1/VDD2 voltage change on oscilloscope when SR is enabled. The voltage should be reduced based on silicon performance programmed in eFuse and temperature condition. The voltage should be stable after transition and not oscillating. You can also monitor I2C4 transaction send from voltage controller in the processor. Please perform the test for each OPP in VDD1 and VDD2.