| Signal Name | Direction | Description |
|---|---|---|
| s_axi_aclk | Input | AXI Clock |
| s_axi_aresetn | Input | AXI Reset. Active-Low |
| s_axi** | Input | AXI4-Lite interface, defined in the Vivado Design Suite: AXI Reference Guide (UG1037) |
| ctl_clk | Input | Free running clock. s_axi interface clock is connected |
| ctl_reset | Input | Reset signal and external reset is connected |
| iic_scl_in | Input | I2C bus SCL input |
| iic_sda_in | Input | I2C bus SDA input |
| iic_sda_out | Output | I2C bus SDA output |