Description
The Intel Power Distribution Network (PDN) Tool might suggest 0 decoupling capacitors when using an Enpirion Voltage Regulator Module (VRM). The Enpirion VRM models in the PDN Tool include the base required bulk capacitance that is documented in the Enpirion datasheet.
Resolution
If the combined Enpirion VRM and base capacitance models used in the PDN Tool meet your FPGA design specific target impedance, no further capacitors will be added by the PDN Tool.
If you choose to adjust the Enpirion VRM compensation by adding more bulk capacitance as directed by the Enpirion Datasheet, you must add this extra bulk capacitance to the PDN Tool manually.