AM335X SD Card SSC

xin Ryan

Expert 1140 points

Hi,everyone:
My platform AM335X, SDK6.0, My SD Card EMI test failed.
Could you tell me who know SD Card SSC?

over 9 years ago

0 xin Ryan over 9 years ago

Expert 1140 points

Hi, everyone
Someone has studied?

0 Biser Gatchev-XID over 9 years ago in reply to xin Ryan

TI__Guru**** 393215 points

Hi,

Do you have ESD protection on your SD lines?

0 xin Ryan over 9 years ago in reply to Biser Gatchev-XID

Expert 1140 points

Hi,
yes, I have.

0 Biser Gatchev-XID over 9 years ago in reply to xin Ryan

TI__Guru**** 393215 points

What do you mean by "SD Card SSC"?

0 Biser Gatchev-XID over 9 years ago in reply to Biser Gatchev-XID

TI__Guru**** 393215 points

If you mean spread-spectrum clocking, this isn't supported on the AM335X MMC ports.

0 xin Ryan over 9 years ago in reply to Biser Gatchev-XID

Expert 1140 points

Hi,
Read your Datasheet,PER_CLKOUTM2(192M) /2 divider to create 96M Hz for MMC_CLK.
So I want SSC for PER_CLKOUTM2.
And I find CM_CLKMODE_DPLL_PER register, Bit12 is disbale & enable SSC?
The Last, I want to see SD Card SSC and ESD related.

0 Biser Gatchev-XID over 9 years ago in reply to xin Ryan

TI__Guru**** 393215 points

This post http://e2e.ti.com/support/arm/sitara_arm/f/791/t/300215.aspx includes the latest information about PER_PLL SSC from the factory team.

0 xin Ryan over 9 years ago in reply to Biser Gatchev-XID

Expert 1140 points

They seem to have the enable SSC, but I don't know how to enable.
You can contact your factory team?

0 Wolfgang Muees1 over 9 years ago in reply to xin Ryan

Genius 3685 points

TO enable SSC, read:

http://e2e.ti.com/support/arm/sitara_arm/f/791/p/198104/1123383.aspx#1123383

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AM335X SD Card SSC