Re: [beagleboard] BeagleBone Black eMMC Conflict Pins

[Gerald Coley]

The schematic shows which pins are used for the eMMC. The schematic reflects what is on the PCB. 

Next week I will check the SRM tables and look for any confusion and make all necessary corrections that I find..

Gerald

On Sun, Apr 21, 2013 at 10:05 PM, John Leichty <jlei...@gmail.com> wrote:

I've noticed that on the latest BeagleBone Black SRM (rev A5.2) there seems to be conflicting information on what P8 expansion connector pins are used for the on-board eMMC device.

The recently added Table 13 in section 8.1.2 lists the eMMC conflict pins as P8 pins 11-17 and 19-21.

The schematic in Figure 32 in section 6.4.2 shows the on-board eMMC device using (with some Table 10 lookup) P8 pins 3-6 and 20-25.

Which one is correct? Or am I missing something? Thanks.

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Gerald

 

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[Chris Micali]

Gerald,

     Does this mean that P8 pins 3-6 and 20-25 cannot be used on the BeagleBone Black if we use the eMMC?  I'm currently using these pins as GPIO...

Thanks,

-chris

[Gerald Coley]

That is what it means. The idea is that If you can hold off using those pins until the SW can reset the eMMC, meaning no signals applied to any pin,  then you can use them after the eMMC is put into reset. That also means you must boot from uSD.

Gerald

[Chris Micali]

Gerald,

   

   OK makes sense, thanks. 

-chris

[mvca...@gmail.com]

Gerald,

If you're back from the travel last week, have you confirmed that the the schematics are the correct eMMC pin outs over the table?
I'm doing some BBB cape design and just want to confirm that I'm using the correct info.

Dave

[Gerald Coley]

The schematics are indeed correct. They match the PCB that is being built. You can also check the BeagleBone schematics and compare them as well if you like.

I do no put bad schematics out for public use. SRM may have a few issues as I attempt to translate the schematic to words, figures, and tables.

Gerald

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[Gerald Coley]

As I have mentioned, there is nothing to disable. Just done't plug in a monitor. all the pins are inputs to the framer. Just make them be whatever you like. The framer has no off switch.

This is discussed in the System Reference Manual.

Gerald

On Fri, May 3, 2013 at 3:50 PM, <feli...@gmail.com> wrote:

How I can disable HDMI framer to use GPIO pins like a Beaglebone White (first) ?

Tnx.

On Monday, April 22, 2013 5:05:19 AM UTC+2, John Leichty wrote:

I've noticed that on the latest BeagleBone Black SRM (rev A5.2) there seems to be conflicting information on what P8 expansion connector pins are used for the on-board eMMC device.

The recently added Table 13 in section 8.1.2 lists the eMMC conflict pins as P8 pins 11-17 and 19-21.

The schematic in Figure 32 in section 6.4.2 shows the on-board eMMC device using (with some Table 10 lookup) P8 pins 3-6 and 20-25.

Which one is correct? Or am I missing something? Thanks.

--

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