AM6548: PG2.0 IDK, pull up at mmc0_clk added?

Robert Finger

Part Number: AM6548
Other Parts Discussed in Thread: TMDX654IDKEVM,

Team,

On the latest IDK schematics (PROC062 001 OPN#TMDX654IDKEVM, Rev A, Feb 2020) a 49.9 kOhm pull-up (R795) has been added to mmc0_clk. This resistor wasn't there in previous revisions.

What's the reason behind adding this resistor? Is this something customers should implement as well on their boards?

Thanks,
Robert

over 4 years ago

0 Shiou Mei Huang over 4 years ago

TI__Genius 10180 points

Robert,

This was likely added by accident. I will check on this and update the thread.

Best Regards,

Shiou Mei

0 Devin Woerner over 4 years ago in reply to Shiou Mei Huang

Intellectual 330 points

Hello, any updates on this? Thanks!

0 Shiou Mei Huang over 4 years ago in reply to Devin Woerner

TI__Genius 10180 points

Robert, Devin,

I have confirmed this PU addition was intentional. The eMMC flash device assumes the CLK is always driven, but on AM6548 this is not the case after PORz, so a PU should be added to prevent the bus from floating.

Have a great day!

BR,

Shiou Mei

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AM6548: PG2.0 IDK, pull up at mmc0_clk added?