> -----Original Message----- > From: linux-mmc-ow...@vger.kernel.org [mailto:linux-mmc- > ow...@vger.kernel.org] On Behalf Of Philip Rakity > Sent: Monday, July 18, 2011 8:57 PM > To: Subhash Jadavani > Cc: linux-mmc@vger.kernel.org; arindam.n...@amd.com > Subject: Re: Question regarding SDR104 bus speed mode > > > On Jul 17, 2011, at 10:21 PM, Subhash Jadavani wrote: > > > Arindam/Philips, > > > > Can you help me with below query? > > > > Regards, > > Subhash > > > >> -----Original Message----- > >> From: linux-mmc-ow...@vger.kernel.org [mailto:linux-mmc- > >> ow...@vger.kernel.org] On Behalf Of Subhash Jadavani > >> Sent: Thursday, July 14, 2011 5:09 PM > >> To: linux-mmc@vger.kernel.org; prak...@marvell.com; > >> arindam.n...@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? > > Check the datasheet for the chip vendor you are using assuming the > chip is soldered down on the board. Our our system the eMMC chip > is much more flexible then the JEDEC spec allows.
Philips, This is not for eMMC/MMC spec and cards. This is for SDR104 mode from SD3.0 spec. and relevant for SD UHS-I cards only. Any comments of running SDR104 with 600mA driver current? Is this fine according to SD3.0 spec? > > >> > >> Regards, > >> Subhash > >> > >> -- > >> Sent by a consultant of the Qualcomm Innovation Center, Inc. > >> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora > >> Forum. > >> > >> -- > >> To unsubscribe from this list: send the line "unsubscribe linux-mmc" > in > >> the body of a message to majord...@vger.kernel.org > >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
