AM5728: PCIe _REF_CLK source

Tony Tang

Part Number: AM5728
Other Parts Discussed in Thread: CDCM9102,

Can connect AM57xx PCIe_REF_CLK to target peer directly? LJCB_CLK output clock as source? remove the CDCM9102 on the IDK schematic?

About the decoupling capacitor placement, put it on source end? right? but on the IDK PCB, it is on the PCIe socket side. please clarify.

over 5 years ago

0 Ibiza_kk over 5 years ago

Prodigy 140 points

0 -DK- over 5 years ago

TI__Mastermind 27720 points

Hello Tony,
Are you asking if you can eliminate the CDC device and provide the PCIe REFCLK directly from the AM57xx device?

0 Tony Tang over 5 years ago in reply to -DK-

TI__Mastermind 25196 points

DK,

Yes, it is my question. Please help clarify. Thanks.

0 -DK- over 5 years ago in reply to Tony Tang

TI__Mastermind 27720 points

Tony,

Yes, the PCIe REFCLK can be provided by the SoC. Please refer to the TRM, starting with section 26.4.4.4 for details. DPLL_PCIE_REF is a good search term for this query.

As for your capacitor placement question, this has been answered here before. Please take a look at e2e.ti.com/.../2195210.

0 Ibiza_kk over 5 years ago in reply to -DK-

Prodigy 140 points

how to change ACSPCIE module's mode in RX mode or TX mode ? I didn't find any available method in AM5728 TRM;Could you please provide some useful tips ? thank you

0 -DK- over 5 years ago in reply to Ibiza_kk

TI__Mastermind 27720 points

Hi,
Are you using our Linux SDK? If so, what version?

0 Tony Tang over 5 years ago in reply to -DK-

TI__Mastermind 25196 points

-DK- said:
As for your capacitor placement question, this has been answered here before. Please take a look at e2e.ti.com/.../2195210.

DK,

The URL can't open. would you please double check?

0 -DK- over 5 years ago in reply to Tony Tang

TI__Mastermind 27720 points

Sorry Tony, the forum software was recently updated and it broke some links.

Try this:
e2e.ti.com/.../597174

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AM5728: PCIe _REF_CLK source