原创 difference constraints between pre- and post-layou

jitter = 0.1
skey = 0.5
source latency = 4
network latency = 2
 
pre-layout
  creat_clock -period 30 -n MCLK clk
  set_clock_uncertainty 0.5 MCLK
  set_clock_transition 0.25 MCLK
  set_clock_latency -source 4 MCLK
  set_clock_latency 2 MCLK
post-layout
  creat_clock -period 30 -n MCLK clk
  set_clock_uncertainty 0.1 MCLK
  set_clock_latency -source 4 MCLK

uncertainty / latency是否会影响Input/output timing
  set_propagated_clock MCLK