Texas Instruments, NXP, Rockchip, Allwinner and many many others".
* Number of wires shall be minimised especially in cases where
- outputs need to change characteristics of the IO pad (puen, oe)
+ the IO pad (puen, oe) need to change under the control of the
+ function (not the GPIO registers).
* There shall be no short-circuits created by multiple input
pins trying to drive the same input function
* The IO pad shall have pull-up enable, pull-down enable, variable