Using the PLL Block

The Trion T4 and T8 FPGAs have a simple PLL. This PLL is referenced as PLL_V1 in the Python API.

Note: In this mode, a specific GPIO block with an alternate connection type must generate the reference clock(s). The PLL Block Summary shows the resource name to use.
  1. Add a GPIO block.
  2. Enter the instance name.
  3. Choose input as the mode.
  4. Choose pll_clkin as the connection type.
  5. In the Resource Assigner, assign it to the resource shown in the summary.
You can set up the PLL using the PLL Clock Calculator or manually using the Block Editor.
  • In the PLL's Properties tab, you specify general settings such as the instance name, PLL resource, clock source, and external clock.
  • Click the Automated Clock Calculation button to open the PLL Clock Calculator.
  • Click the Manual Configuration tab to configure the PLL manually.