4 Replies Latest reply on Jul 24, 2012 11:03 AM by userc_41870

    Benicia PMMC

    userc_41870

      Just got the Benicia DVK yesterday and have a big question about PMMC, the reason to use Benicia is because it has build-in eMMC 4.41 host controller, that means I can issue COMMAND to access eMMC instead of read/write only, but from datasheet, PMMC is activate when connecting to a application processor with eMMC host. But if I already had eMMC host on the host AP, why I still need an additional Benicia to access eMMC?? Is it possible: MMC_D0 - MMC_D7/ MMC_CLK / MMC_CMD connect to eMMC device and then use PMMC interface to access eMMC device?

         

      Thank you!

        • 1. Re: Benicia PMMC
          rabv_289766

          Hi Yi,

             

          When you use Benicia following are the advantages that you get:

             

          1. It does not mandatory for AP to support eMMC functionality. The interface between AP and Benicia could be anything and you can still access the storage connected to Benicia.

             

          2. The major benefit that you get is side loading. Your AP will be free to do other tasks as Benicia is handling the storage.

             

          3. Your AP may not support the latest eMMC specification.

             

           

             

          Thanks,

             

          sai krishna.

          • 2. Re: Benicia PMMC
            userc_41870

            Thanks Sai, can S-Port be configured as slave interface, I want to use command to access MMC device.

            • 3. Re: Benicia PMMC
              rabv_289766

              No. S-port acts as eMMC/SD host controller. Benicia S-port needs to act as SD/eMMC host when it is handling the storage media (SD/eMMC) that is connected to it.

                 

              Regards,

                 

              sai krishna.

              • 4. Re: Benicia PMMC
                userc_41870

                 

                   

                Sai, 2 questions:

                   

                1. I want Benicai to be main (only one) processor in the system, can you provide me the example code of stand-alone firmware instead of API mode?

                2. I am now running the apitb.exe and want to connect to DVK, but always apitb give me the same error message GetFpgaHandle failed: -1

                cy_wb_hal_start failed with code -1

                I tracked into and found apitb can not find the deviceId 0x9030 at routine: SelectDevice(PLX_DEVICE_KEY *pKey), how to fix it?

                Thank you!