DRA821U: bootmode

xiao xun

Part Number: DRA821U

Hi TI experts,

When booting the DRA821 in SD card boot mode, should the

MMC0_SDCD/MMC1_SDCD signal be low level?

Best regards,

xun.xiao

over 2 years ago

0 Marco Garcia over 2 years ago

TI__Intellectual 1230 points

Yes, as per the DM: "For ROM boot to work properly, the MMC1_SDCD pin should be pulled low externally with a resistor."

Regards,

Marco

0 xiao xun over 2 years ago in reply to Marco Garcia

Prodigy 60 points

Dear Marco

Thank you for your reply.

When booting the DRA821 from SD card　by Primary Boot Mode,
The Backup BootMode pins(C7,A6,B8,C17)should be pulled low level?

Best regards,

xun.xiao

0 Marco Garcia over 2 years ago in reply to xiao xun

TI__Intellectual 1230 points

If you would like no backup boot mode to be selected then yes, the backup boot pins can all be pulled low level. TRM section 4.3.2.2 and 4.3.2.4 details other possible configurations:

Regards,

Marco

0 xiao xun over 2 years ago in reply to Marco Garcia

Prodigy 60 points

Dear Marco

Thank you for your reply.


If I don't select backup boot mode and all the backup boot pins are NC,
 will anything go wrong during boot? .

Best regards,

xun.xiao

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DRA821U: bootmode