Duplicate SPI2 port pinouts on Teensy 3.5/3.6?

[SteveStolen]

Just got in my Teensy 3.5/3.6 Breakout kit, Standard Edition, Rev A from tall-dog.com and am studying installation instructions. I stumbled across duplicate pin sets for SPI2 port while comparing the two layout cards. The one for the Teensy 3.6 I am using is the card9b_rev1_print.pdf file for the back side (also the card that came with my 3.6). Pins 43 & 54 are labeled CS2, 44 & 52 are MOSI2, 45 & 51 MISO2, and finally, 46 & 53 are SCK2. Both cards agree with the same duplications. Is this intended or is one set supposed to be SPI3? If SPI3 or something else, I hope this is on your list for next revision of the board pin assignments.

Please qualify. It adds to confusion. I am trying to set up one of my Teensy 3.6 boards for total access breadboarding, thus the purpose of the neat breakout board.

 

[GremlinWrangler]

Black pin labels are the default pins, light gray are pins that can be allocated to the hardware if you find your application has a conflict. For example if you need the LED on pin 13 you could define the sck0 to be pin 14 instead.

If laying out a breakout you would work out which options you are going to use (most likely the defaults) and work from there, unless you are going to get crafty and group all options for a given bus together (so bring out all SCK0 to a jumper row). Which would be useful but a very complex board layout.

There was some discussion on card layout during the kickstarter trading readability vs criticality, can't remember why that key piece of information didn't make the cut.

Edit: it's also missing from the store page, which isn't space constrained.

 

[SteveStolen]

Thanks for the explanation. The light gray pin labels at first didn't make sense. Somewhere I missed any explanation about the differences. Meanwhile I am having fun with this new Teensy series.