RE: Question regarding SDR104 bus speed mode

Subhash Jadavani
2011-07-18T05:21:57Z

Arindam/Philips,

Can you help me with below query?

Regards,
Subhash

> -----Original Message-----
> From: linux-mmc-owner@vger.kernel.org [mailto:linux-mmc-
> owner@vger.kernel.org] On Behalf Of Subhash Jadavani
> Sent: Thursday, July 14, 2011 5:09 PM
> To: linux-mmc@vger.kernel.org; prakity@marvell.com;
> arindam.nath@amd.com
> Subject: Question regarding SDR104 bus speed mode
>
> Hi Arindam, Philips and All,
>
> According to SD 3.0 spec (section 3.9.6), cards may require current
> upto
> 800 mA while running in SDR104. However Max. supported current from
> PMIC
> regulator connected to sd card slot on my board is 600mA.
>
> I have these questions:
> 1. So does this mean we can't support the SDR104 mode if regulator
> current
> driving capacity is not upto 800 mA?
>
> 2. I am able to make SD card run in SDR104 mode even if the max.
> current
> supplied by regulator is upto 600 mA. So is this 800mA requirement is
> **must** condition to support SDR104 mode reliably?
>
> Regards,
> Subhash
>
> --
> Sent by a consultant of the Qualcomm Innovation Center, Inc.
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> Forum.
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