TDA4VM: The CAN-FD Controller performance form fill

Closing this thread. It is the same as https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1110778/tda4vm-the-can-fd-controller-performance-form-fill 

The URL you mentioned is the current URL,No duplicate.

Sorry that was a glitch in the system. I have asked my colleague to take a look at this question.

Can you clarify what you mean by IP name and version number?  The rest of your questions are properties of the PLL. You have a choice of the following PLLs for the MCAN functional clock: MCU_PLL2_HSDIV3 and MCU_PLL1_HSDIV2 for an MCU_MCAN interface, or PLL0_HSDIV4 for a Main MCAN interface.  I will try to find the specs for those PLLs.

1.CAN IP is the name of the manufacturer's CAN FD architecture, such as MCU IP is R5F.
2.We are using MCU_MCAN_0, his clock source is MCU_PLL2_HSDIV3_CLKOUT.
3.How to know if a PLL is frequency modulated?
And the other questions on the picture need to clarify,Please tell us if you know.

The IP is  provide by Bosch, MCAN version  is v3.2.3. 

Please don't forget other questions.

Hi Zack,

Could you provide feedback on the remaining questions?

- Keerthy

The CAN has a mux that allows different PLL sources. I have measured the PLL configured to run at 2GHz and divided down to an 80MHz clock for the CAN. The procedure was to measure the PLL's period and then use the standard deviation of the distribution to define the jitter.

Jitter has a peculiar characteristic. As you measure over longer durations, the absolute value of the jitter increases but the percentage of the period decreases. That is reflected in the table shown below:

I have treated the short-term jitter as the jitter associated with 1 80MHz time-quanta.

I have treated the long term jitter as the jitter associated with 5 or 10 bit times (based upon reading Robustness of a CAN FD Bus System – About Oscillator Tolerance and Edge Deviations by Arthur Mutter); and without knowing what bit rate you are using, I have bounded the jitter by looking at 1Mbps and 8Mbps.

Short Term Jitter:

Long Term Jitter:

Kevin

Hi Kevin,

Thanks for reply!

How about these two questions? 

BR

I do not know what is intended by "PLL tolerance." Please define.

Kevin

Also, the PLL can be modulated but whether it is modulated and the depth / frequency is programmable and your decision.

Kevin