Aligning with Physical Components on the PCB - Aligning with Physical Components on the PCB - 2025.2 English - UG1506

Versal Adaptive SoC Board System Design Methodology Guide (UG1506)
Document ID
UG1506
Release Date
2025-12-17
Version
2025.2 English

First, establish the orientation of the device on the PCB. Consider the location of fixed PCB components as well as internal device resources. For example, aligning the GT interfaces on the device package to be as close to the components with which they interface on the PCB leads to shorter PCB trace lengths and fewer PCB vias.

A sketch of the PCB including the critical interfaces can often help determine the best orientation for the device on the PCB as well as placement of the PCB components. After completion, you can plan the rest of the device I/O interface.

High-speed interfaces, such as memory, can benefit from having very short and direct connections with the PCB components with which they interface. These PCB traces often have to be matched length and not use PCB vias, if possible. In these cases, the package pins closest to the edge of the device are preferred to keep the connections short and to avoid routing out of the large matrix of BGA pins. For more information, see this link in the Versal Adaptive SoC PCB Design User Guide (UG863).

The I/O Planning view layout in the AMD Vivado™ IDE is useful in this stage for visualizing I/O connectivity relative to the physical device dimensions, showing both top-side and bottom-side views.

Thermal Tip: For thermally-challenged designs, be aware of device placement in relation to other high-power components to minimize thermal coupling and maximize airflow. Avoid placement where the device is positioned in the exhaust of another high-power component or where board heating might negatively impact the operating temperature. AMD recommends thermal simulation to understand how the placement and environmental conditions can affect the junction temperature of the device.

The following figure shows the I/O Planning view layout.

Figure 1. I/O Planning View Layout