PrimeTime一般用作sign off的timing check，也可用在DC之后的netlist的timing analysis
一般的使用流程：
1) Read design data,--------------netlist,db,sdf,parasitics,milkway
2) Constrain design,--------------sdc
3) Specify env and analysis condition,
4) Check design and analysis setup,
5) Perform a full analysis,
Read design:
通过set search_path "" 来设置db/lib
set link_path "" (optional)
link_design TOP (指定design top)
read_verilog/read_vhdl 来读入netlist到PrimeTime
read_parasitics/read_sdf 进行annotation
read_sdc/source 进行timing constraints和exception约束
Constraining The Design:
约束clock characteristics
约束input delay at input port
约束output delay at output port
针对clock，create_clock创建，include name，source，period，waveform
clock network，set_clock_uncertainty, set_propagated_clock, set_clock_transiaction, set_clock_latency
create_generated_clock
set_input_delay
set_output_delay
Specify env and analysis condition
Specify process, temperature, voltage
apply case analysis and mode analysis set_case_analysis single/BC_WC/OCV set_case_analysis/set_mode(lib中不同的characteristic)
specify driving cell at input ports, load at output ports set_driving_cell set_load
specify timing exceptions set_min_delay set_max_delay set_disable_timing
specify wire load model and back-annotated set_wire_load_model/read_sdf/read_parastics
Check Design and analysis setup
check timing
report_design
report_port
report_net
report_lib
report_path_group
report_clock
report_wire_load
Performing a Full Analysis
report_timing -delay_type/-from/-to/-through/-rise_through/-rise_from
report_constraint
report_analysis_coverage
report_delay_calculation
PrimeTime中的Design Objects，可以使用get命令， set_input_delay 2.3 [get_ports IN*]
cell---------instance in the design, include reference hierarchical blocks and library cell
lib_cell--------cells in technology library
lib_pin-------pins in library cells
net----------nets in current design
pin-----pins of lower-level cells in the design, can be input/ output/ inout
port-------ports of current design, can be input/ output/ inout
path group----Timing reports organized by path group