Full Chip Synthesis

Full chip constraints

• Specify Clock Frequency

  create_clock -period 20 -name master_clock [get_ports Clock]
  

• Model Clock Tree   uncertainty = skew + jitter

  set_clock_latency     2.5 [get_clocks master_clock]
  set_clock_transition  0.5 [get_clocks master_clock]
  set_clock_uncertainty 1.0 [get_clocks master_clock]
  

• Specify Input and Output Timing

  set_output_delay 2.0 -max -network_latency_included -clock master_clock \
      [all_outputs]
  set_output_delay 0.1 -min -network_latency_included -clock master_clock \
      [all_outputs]
  
  set_input_delay  2.0 -max -network_latency_included -clock master_clock \
      [remove_from_collection [all_inputs] [get_ports Clock]]
  set_input_delay  0.1 -min -network_latency_included -clock master_clock \
      [remove_from_collection [all_inputs] [get_ports Clock]]
  

• Specify Input Drive and Output Load

  set_load 1.0  -max [all_outputs]
  set_load 0.01 -min [all_outputs]
  
  set_driving_cell -max -library c35_IOLIB_WC -lib_cell BU24P -pin PAD [all_inputs]
  set_driving_cell -min -library c35_IOLIB_WC -lib_cell BU1P  -pin PAD [all_inputs]
  

• Specify Timing Exclusions

  set_ideal_network [get_ports nReset]
  

• Other constraints

  set_max_area 0