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1.2.2.1.1. Device Selection Section
1.2.2.1.2. Power Rail Data and Configuration Section
1.2.2.1.3. Meeting Target Impedance when Entering 0 A into the PDN Tool
1.2.2.1.4. Dealing with Multiple Shared Power Supply Pin Types
1.2.2.1.5. VRM Data Section
1.2.2.1.6. Rail Group Summary Section
1.2.2.1.7. VRM Impedance Section
1.2.2.1.8. BGA Via Section
1.2.2.1.9. Plane Section
1.2.2.1.10. Spreading Section
1.2.2.1.11. Implementing Split Planes
1.2.2.1.12. FEFFECTIVE Section
1.2.2.1.13. Decoupling Section
1.2.2.1.14. Results Summary Section
1.2.2.1.15. Recommended Flow for Deriving Decoupling for an FPGA System using the System_Decap Tab
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1.2.2.1.8. BGA Via Section
The BGA Via table shows the L and R values per via. You can set the tool to Calculate, Custom, Default, or Ignore. For a fully customized workflow in which each rail group can have different settings, set the total effective R and L values in the BGA Via section to match your system.
If you set the BGA Via table to Calculate or Ignore, the System_Decap tab uses the same global settings for all rail groups.
If you set the BGA Via table to Default, the PDN tool calculates the R and L values similarly to the Calculate option, however, the tool also calculates the number of power/ground via pairs based on the rails connected to the regulator group. You can input the layer number in the tool. The layer number should match the target layer in Full Stackup. Then, BGA via R and L is calculated corresponding to the layer number.
Figure 9. Setting the Layer Number