SMARC T335x Carrier Board Hardware Design Guide, Document Revision 1.2
Table of Contents
CHAPTER 1 INTRODUCTION...........................................................................................................10
1.1ACRONYMSANDABBREVIATIONS USED............................................................................11
1.2 SIGNALTABLE TERMINOLOGY.............................................................................................14
1.3 DOCUMENTAND STANDARD REFERENCES.......................................................................17
1.4 INTENDED AUDIENCE...............................................................................................................19
CHAPTER 2 INTERFACES.................................................................................................................21
2.1 SMARC T335X CONNECTOR PIN MAPPING ........................................................................30
2.2 ETHERNET INTERFACE............................................................................................................32
2.3 USB INTERFACE..........................................................................................................................45
2.4 PARALLEL RGB LCD INTERFACE..........................................................................................55
2.5 SD/SDIO INTERFACE..................................................................................................................71
2.6 I2SAUDIO INTERFACE..............................................................................................................76
2.7 CAN BUS INTERFACE.................................................................................................................80
2.8 SERIAL COM PORT INTERFACE.............................................................................................85
2.9 SPI INTERFACE............................................................................................................................90
2.10 I2C BUS INTERFACE.................................................................................................................95
2.11 SELECTING THE BOOT MODE..............................................................................................99
2.12 WATCHDOG CONTROL SIGNALS.......................................................................................101
CHAPTER 3 POWER DESIGN GUIDELINE................................................................................104
3.1 POWER SIGNALS ......................................................................................................................104
3.2 RTC BATTERY............................................................................................................................108
3.3 POWER FLOWAND CONTROLSIGNALS BLOCK DIAGRAM.......................................109
3.4 POWER STATES ......................................................................................................................... 111
3.5 POWER SEQUENCES................................................................................................................112
3.6 LAYOUT REQUIREMENTS......................................................................................................116
3.7 REFERENCE SCHEMATICS....................................................................................................117
CHAPTER 4 FLOOR PLANNING THE PCB................................................................................120
4.1 CARRIER CONNECTOR...........................................................................................................120
4.2 MODULEAND CARRIER CONNECTOR PIN NUMBERING CONVENTION ................123
4.3 MODULE OUTLINE – 82MM X 50MM MODULE................................................................123
4.4 MODULE “Z” HEIGHT CONSIDERATION...........................................................................125
4.5 CARRIER BOARD CONNECTOR PCB FOOTPRINT..........................................................126
4.6 MODULEAND CARRIER BOARD MOUNTING HOLES – GND CONNECTION...........127
4.7 CARRIER BOARD STANDOFFS..............................................................................................127
