ICScape
ICScape is a technology leader, delivering fast, placement and ROUTING-aware design closure and optimization solutions addressing timing, clock and power in the design of SOCs.
Why does SoC timing closure: 
- Take more iterations than desired?
- Result in ECO fixes that are not implementable?
- Lead to over buffering, or forced acceptance of lower chip performance?
Some of the main reasons are:
- Poor timing correlation: STA and P&R tools
- P&R tools can handle only few MMMC scenarios per run
- STA-driven ECO is not ROUTING aware
Use TimingExplorerTM which is: 
- Congestion and ROUTING-aware
- Simultaneously handles all MMMC scenarios
- Production-proven down to 28nm
- Over 100 tape-outs
For more information go to TimingExplorer