Finding GPIO3_21 on the BBB schematic

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1

I'm looking at a schematic dated Mar 21, 2014, rev C. I'm trying to find where the McASP0 external clock generator, on page 3, goes. It references pp. 6, 10, and 11, but I can only find it on p.4 (which references only p. 11), and p. 11, P9 header, pin 25 (which references only p. 4).

2

You are correct. The caption on P3 is incorrect. McASP0 is connected to R167, U5 Pin A14 and P9 Pin 25

Regards,
John

3

I am not sure exactly which signal you are chasing.

A good reference for which signals are routed to which pins under which modes is Molloy’s Header Charts:

http://exploringbeaglebone.com/chapter6/#BeagleBone_BlackHeaderCharts

Download the P8 and P9 header charts.

They also give you a good idea of potential conflicts.

I find reading these easier than chasing things on the schematic.

— Graham

4

Thanks, John!