timing analysis commands

1)report_timing
pt_shell>report_timing
This report includes the following information about each reported path:
* path startpoint, endpoint, and intermediate points
* Incremental and cumulative delay at each point along the path
*final data arrival time at the endpoint
* time at which the data must arrive at the endpoint to meet the constraint ("data required time")
* setup timing slack ( required time minus arrival time)

2)report_constraint
pt_shell> report_constraint -all_violators -verbose

3> report_bottleneck

pt_shell>report_bottleneck

4> report_global_slack
pt_shell>report_global_slack -significant_digits 4 -nosplit

5>report_analysis_coverage

5>report_delay_calculation

6>report_delay_calculation

7>timing analysis updates

8>fixing timing violations

**insert_buffer, size_cell, swap_cell

9> saving and restoring single_core sessions
save_session
restore_session