Why does the Arria 10 device version of the Altera PDN Tool recommend so many decoupling capacitors for the transceiver VCCR_GXB and VCCT_GXB supplies?

Description

Due to a bug in the Arria® 10 device version of the Altera® PDN Tool, the Feffective frequency of the transceiver VCCR_GXB and VCCT_GXB supplies is fixed at 70MHz.

Resolution

To work around this problem you can click on the Feffective “Calculate” cell in the PDN Tool and select “Override”. You can then enter “30MHz” in the frequency cell.

This problem will be fixed in a future version of the Arria 10 device PDN Tool.