4.3 Power Integrity

The recommended board capacitors are listed in Table 3-1 for the SFP+ application. The bulk capacitors for the VDD mentioned in Table 3-1 are for the PolarFire device only. Table 3-1 does not list the capacitors required for the output of the regulator. The regulator output must follow the capacitor specifications of the regulator vendor.

• The bulk capacitor recommendations for VDD are based on 1.5A of consumption.
• Care must be taken while routing the VDD plane. Ensure that the plane is routed as a dedicated plane so that no IR drop occurs at any location of the net. This would also ensure the ripple for VDD is at a minimum.
• Place all 0.1 µF and 0.01 µF capacitors under device BGA.