AN 750: Using the Altera PDN Tool to Optimize Your Power Delivery Network Design

ID 683155
Date 7/08/2015
Public
Document Table of Contents

1.6.10. Swapping VCC on Layer 9 with VCC, VCCT_GXB, and VCCR_GXB on Layer 4

Swapping VCC on Layer 9 with VCCT_GXB and VCCR_GXB on Layer 4 to see the effect of moving the VCC supply closer to the FPGA at the expense of the VCCT_GXB and VCCR_GXB supplies has the effect of improving the VCC Feffective to 38.78MHz. All three supplies now require greater than 301 capacitors so this is not a viable solution because the VCCT_GXB and VCCR_GXB supplies may be insufficiently decoupled. For this design example, we keep VCC on Layer 9, and VCCT_GXB and VCCR_GXB on Layer 4.

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