4.0 Functional DescriptionΒΆ 4.1 Digital I/O Cell Control Pins 4.2 Tri-state Programmable Digital I/O Cell 4.3 Tri-state 24mA Programmable Digital I/O Cell 4.4 Input Only I/O Cell 4.5 Analogue Signal Cells 4.6 Power supply pads and Corner pad