P8/P9 pin # to cape eprom address mapping question

I have 3 questions about the EPROM entries for pin Usage.

The BBB SRM (pg 87) says that there are eprom entries for 74 pins on the expansion connectors.
OK, I figure we have two connectors (P8 & P9); so 2x46 = 92, but we’d only be setting pin usage info for digital signals…

Here is what I think comprises the “74” digital signals:
92 pins

  • 2 for P8 1&2 (gnds)
  • 8 for P9 1-8 (power rails)
  • 4 for P9 43-46 (gnds)
  • 2 for P9 32, 34 (analog pwr & gnd)
  • 1 for P9 9 (pwr_but) – this is a guess
  • 1 for P9 10 (sys_reset) – this is a guess

Sigh - note to self: refrain from posting questions when tied…
I found the additional table in the SRM that answers my questions.
I should have known that Gerald would not have left that mapping out… :wink:

Tied? Uh, we don’t allow that sort of topic on this site!!<:^)


Oh my, even my typos are getting me in trouble now…
Time to go practice… …home row: asdf hjkl asdf hjkl asdf hjkl -
I think that’s how the typing lessons (from way back when there were manual typewriters to teach this with) from so long ago started out… :wink:


I don’t type. I press a bunch of keys. Let spell checker fix the rest! My mind moves way to fast for my fingers!