Jetson AGX Xavier Series Product DG-09840-001_v2.5 | ix
15.2.1 JTAG .......................................................................................................................... 118
15.2.2 Debug UART ............................................................................................................. 119
15.3 Strapping Pins ................................................................................................................ 119
15.4 Boundary Scan Test Mode ............................................................................................. 120
15.5 Safety MCU JAXi Only ..................................................................................................... 121
Chapter 16. Pads .................................................................................................. 123
16.1 MPIO Pad Behavior when Associated Power Rail is Enabled ...................................... 123
16.2 Schmitt Trigger Usage ................................................................................................... 123
16.3 Pins Pulled and Driven During Power-on ..................................................................... 123
16.4 Pad Drive Strength ......................................................................................................... 124
Chapter 17. Unused Interface Terminations ........................................................ 125
17.1 Unused MPIO Interfaces ................................................................................................ 125
17.2 Unused SFIO Interface Pins ........................................................................................... 125
Chapter 18. Design and Bring-up Checklists ....................................................... 126
Chapter 19. General Layout Guidelines ................................................................ 127
19.1 Via Guidelines ................................................................................................................. 127
19.1.1 Via Count and Trace Width ...................................................................................... 127
19.1.2 Via Placement .......................................................................................................... 127
19.1.3 Via Placement and Power and Ground Corridors .................................................. 127
19.2 Connecting Vias .............................................................................................................. 129
19.3 Trace Guidelines ............................................................................................................. 129
19.3.1 Layer Stack-Up ........................................................................................................ 129
19.3.2 Trace Length ............................................................................................................ 129
Chapter 20. Stack-Ups ......................................................................................... 130
20.1 Reference Design Stack-ups ......................................................................................... 130
20.1.1 Importance of Stack-up Definition .......................................................................... 130
20.1.2 Impact of Stack-up Definition on Design ................................................................ 130
Chapter 21. Transmission Line Primer ................................................................ 131
21.1 Basic Board Level Transmission Line Theory .............................................................. 131
21.1.1 Characteristics ......................................................................................................... 131
21.2 Physical Transmission Line Types ................................................................................ 132
21.2.1 Microstrip Transmission Line ................................................................................. 132
21.2.2 Stripline Transmission Line .................................................................................... 132
21.3 Drive Characteristics ..................................................................................................... 133
21.4 Receiver Characteristics ................................................................................................ 133
21.5 Transmission Lines and Reference Planes .................................................................. 134
Chapter 22. Design Guideline Glossary ................................................................ 137
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