Tip: For high-speed propagation
across SLRs, be sure to register signals that cross SLR boundaries.
SLL signals are the only data connections between SLR components.
The following do not propagate across SLR components:
- Carry chains
- DSP cascades
- Block RAM and UltraRAM cascades
The tools normally take this limit on propagation into account. Consider this limit when building long cascades to ensure designs route properly and meet your design goals. Manually place such logic near SLR boundaries.