The GPIO channels for three of the GPIO banks (26 channels each) can be routed to one of two places:
- MIO pins, or
- PL EMIO port signals (default)
The GPIO channels for the three other GPIO banks (32 channels each) are always routed to the PL via EMIO.
Each GPIO channel consists of data in, data out, and 3-state output control. For MIO, these signals control the I/O buffer on the pin pad. For PL EMIO, all three signals connect between the GPIO controller and the PL. The I/O channel parameters are programmed on a per bank basis.