Grid vs Stacked SLR Crossing Reporting - 2025.2 English - UG906

Vivado Design Suite User Guide: Design Analysis and Closure Techniques (UG906)

Document ID
UG906
Release Date
2025-12-10
Version
2025.2 English

For multi-SLR single column devices, the post-place estimate of SLR crossing resources is accurate. Some minor cell movement can occur across SLRs to improve timing, but the tool accounts for paths crossing multiple SLRs in each individual crossing segment. For example, a connection from SLR0 to SLR2 is treated as SLR0-SLR1-SLR2, and the tool includes a route in each segment.

For multi-SLR multi-column devices, the post-place estimate assumes that the router chooses adjacent SLRs when possible. However, multiple routing solutions can exist. For example, in a 2×2 SLR device, a connection from SLR0 to SLR1 can take either a direct route (SLR0-SLR1) or an indirect route (SLR0-SLR3-SLR2-SLR1). If adjacent SLR usage exceeds 100%, the tool might choose a slower alternate route to complete the connection.

Diagonal routes between SLRs, such as SLR0–SLR2 or SLR1–SLR3, are reported as one vertical and one horizontal segment.

Figure 1. SLR Connectivity Report for a 2x2 SLR Crossing Place

After routing is complete, the report shows only the actual routing used.

The SLR CLB Logic and Dedicated Block Utilization table displays the resource utilization for each SLR. You can toggle between utilization values and percentages using the % icon in the GUI to support SLR partition analysis.

Figure 2. Utilization in Each SLR