Contents
NI Ultiboard User Manual xii ni.com
Chapter 6PCB Calculators
PCB Transmission Line Calculator...............................................................................6-1
Microstrip Trace Calculations.........................................................................6-2
Embedded Microstrip Trace Calculations.......................................................6-3
Centered Stripline Trace Calculations............................................................ 6-4
Asymmetric Stripline Trace Calculations....................................................... 6-5
Dual Stripline Trace Calculations................................................................... 6-6
PCB Differential Impedance Calculator........................................................................6-7
Microstrip Calculations...................................................................................6-8
Embedded Microstrip Calculations.................................................................6-9
Centered Stripline Calculations ......................................................................6-11
Asymmetric Stripline Calculations.................................................................6-12
Chapter 7Autorouting and Autoplacement
Autoroute Menu Items...................................................................................................7-1
Autoplacement of Parts .................................................................................................7-2
Pre-Placing Parts.............................................................................................7-2
Understanding How the Autoplacer Works.................................................... 7-2
Running the Autoplacer.................................................................................. 7-3
Controlling the Autoplacer .............................................................................7-3
Strategies to Achieve Better Part Placement...................................................7-5
Autorouting....................................................................................................................7-6
Understanding How the Autorouter Works.................................................... 7-6
Understanding the Four Fundamental Routing Functions.............................. 7-7
Router Preprocessing........................................................................7-7
Initial Routing...................................................................................7-7
Rip-up and Retry Routing.................................................................7-7
Optimization.....................................................................................7-8
Routing Selected Parts and Nets.....................................................................7-8
Running the Autorouter ..................................................................................7-8
Interactivity.......................................................................................7-9
Autorouting buses...........................................................................................7-9
Placing Automatic Test Points........................................................................7-10
Controlling the Routing Functions..................................................................7-11
Routing Options: General Tab..........................................................7-11
Routing Options: Cost Factors Tab.................................................. 7-12
Routing Options: Rip-Up Tab ..........................................................7-14
Routing Options: Optimization Tab .................................................7-15
Routing Options: Bus Autorouting Tab............................................7-16
Strategies to Achieve Better Routing Results................................................. 7-17