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AM1705 queries

Other Parts Discussed in Thread: AM1705

HI Chmaps,

 

We have some doubts regarding AM1705 below points, please provide the information AS AP.

AM1705 supports  SD card 4-bit or not?

Am1705  USB support for device mode or host mode, we require device mode.

 

Thanks & Regards,

Feroz

  • Hello Feroz,

                        You can Interface SD Card using MMC / SD Controller with 4-bit Mode.

                        USB controller requires the use of an external  charge pump capable of sourcing 5V power. A USB_DRVVBUS is used as a control signal to enable/disable 

                        the external logic to either source or disable power on the VBUS line.For mixed host/device mode of operation, tie this to the external charge pump is needed.

     

    Regards

    Abhijit Das

     

  • Hi Abhijit,

     

    is there a way we can dtermine this from the data sheet ? what features/versions do we need to map to determine the SD Card support?

     

    About USB, do we do support the USB device mode isn't it? It needs the changes as suggested by you.

     

    Why does the data sheet mention USB Client? Why can we not put USB device to be more clear and unambiguous in the data sheet.?

     

    Thanks!

     

    Best Regards

    Feroz

     

     

  • Hi Feroz,

                    Please download Technical Reference Manual (TRM) from http://www.ti.com/product/am1705

                    or http://focus.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=spruh93&fileType=pdf.

                    1. a)  Under TRM you can get the details common interface of SD card 24-2. MMC/SD Controller Interface Diagram under SD card

                         b) Figure 24-3. helps you to 4 bit interface MMC Configuration and SD Configuration Diagram with SD/ MMC card Controller


                     2  USB Device you go Universal Serial Bus 2.0 (USB) Controller main page no 1206 -1207.

     

    Regards

    Abhijit