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Question on EVM6437 DSP speed

Anonymous
Anonymous

Hello,

 

I would like to ask one question on the speed of DM6437 on EVM6437.

            

          

                  

             

Because

1.      From slvs412d, the SWIFT regulator document, I found the formula for calculating output voltage.

2.      From evm6437 schematics, I found the value of resistors determining DSP_CORE_VDD. Substituting these values into the formula, the output voltage is 1.05V.

3.      From evm6437 tech reference, it appears that its DSP can operate at maximum 600MHz, so I presume it is of the -6 device.

From SPRS345d, 5.2 Recommended Operating Conditions, -6 device at 1.05V runs at 450MHz.

 

Is this result correct? If yes, then 450MHz is pretty low in the column, why the EVM picks this value?

 

 

 

Thanks,

Zheng

  • 0
    Genius 3575 points

    Have you actually measured the voltage on your board?  At a glance, the inductor in the schematic is not the same as the example you pasted in.  I have run my evm at 600MHz with no problems, though admittedly not at temperature extremes. 

  • Anonymous
    0 Anonymous in reply to MattLipsey

    Dear Matt,

    I don't have a Spectrum EVM and I am only referencing its PCB design.

    You are right, the inductors in the schematics (2.7uH) and the voltage regulator manual (1.2uH) seems are different. Since the voltage regulator's formula didn't include inductor value, I have no idea whether it affects or not.

     

    Zheng