i.MX6 SD Card maximum PCB Track Lenghts

[skuzu]

Hello,

Question about the maximum PCB signal track lengths for the SD interface :

Because of the tight PCB space and other mechanical limitations, the best we can place the Micro SD connector is 3.5 inches away from the i.MX6 DualLite. Which makes the SD track lengths around 4 inches long. We would like to run the SD interface at SDR12 speed (25MHz).

Is 4 inches of track length acceptable for SD interface to work at 25MHz?

regards,

Selcuk

[igorpadykov · Accepted solution]

Hi Selcuk

length is acceptable. SD Layout guidelines can be found on

sect.6 SD/MMC/SDIO Card and SPI interfaces, 5.3 Minimizing Reflections

AN4215 http://cache.freescale.com/files/32bit/doc/app_note/AN4215.pdf

Best regards

igor

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