topic Re: Do all USDHC ports support SDR104? in i.MX Processors

Do all USDHC ports support SDR104?

hiroshisekoguch — Thu, 19 Mar 2015 11:52:23 GMT

Hello,

There is the sentence "For UHSI cards, clock speed fuses can be set to SDR50 or SDR104 on USDHC3 and USDHC4 ports" in IMXDQRM .

Does this mean USDHC1 and USDHC2 don't support SDR104?

Best Regards

Yuri — Thu, 26 Mar 2015 03:28:15 GMT

According to the Datasheet :

"All four ports support:

• 1-bit or 4-bit transfer mode specifications for SD and SDIO cards up to

UHS-I SDR104 mode (104 MB/s max) ...".

As for boot mode, please refer to Table 5-7 (SD/eSD Boot Fusemap) and

Table 5-8 (MMC/eMMC Boot Fusemap) of the i.MX6 DQ Reference Manual.

Regards,

Yuri.

hiroshisekoguch — Thu, 26 Mar 2015 09:12:54 GMT

Hi Yuri,

Thank you for your reply.

I see all four ports support UHS-I SDR104 mode, but what does the sentence below mean?

"For UHSI cards, clock speed fuse can be set to SDR50 or SDR104 on USDHC3 and USDHC4 ports" in chapter 8.5.3.3 'SD,eSD and SDXC'

Regards,

Hiroshi Sekoguchi

Yuri — Fri, 03 Apr 2015 09:35:23 GMT

Looks as inaccuracy in the RM.

Regards,

Yuri.