Layout guide line for uSDHC with SDR104 mode in i.MX6

[keitanagashima]

Dear Sir or Madam,

Hello.

My customer would like to use the uSDHC interface with SDR-104 mode.

This mode is very fast speed (104 MB/s max).

Do you have Layout guide line for uSDHC with SDR104 mode in i.MX6?

BR,

Keita

[igorpadykov · Accepted solution]

Hi Keita

i.MX6 User Guide does not provide special recommendations

for SDR-104 mode layout. However one can use sect.

3.12 Impedance signal recommendations IMX6DQ6SDLHDG and

sect.6 SD/MMC/SDIO Card AN4215 i.MX28 Layout Guidelines

(given also for double data rate mode).

Best regards

igor

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[keitanagashima]

Hi Igor,

Thank you for your reply.

I found the below description on HW Design Checking List for i.MX6DQSDL

"50Ω impedance control"

"Match Clock and Data signals  ± 50 mils"

Is it possible to reference above descriptions, too?

Best Regards,

Keita

[igorpadykov]

Hi Keita

yes one can also use this document too, as

"summary based on IMX6DQ6SDLHDG and our supporting experience"

Best regards

igor