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1、REF: BBONE_SRM BeagleBone System Reference Manual RevA5.0.0 Page 1 of 83 BeagleBone Rev A5 System Reference Manual Revision 0.0 February 2, 2012 Send all comments and errors to the author: Gerald Coley geraldbeagleboard.org REF: BBONE_SRM BeagleBone System Reference Manual RevA5.0.0 Page 2 of 83 NOT
2、E: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment
3、 generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user
4、will be required to correct the interference at their own expense. All accessories used with this board must meet FCC certification to maintain compliance of this equipment. NOTE:. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning
5、the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that
6、to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. Changes or modifications not expressly approved by this manual for compliance could void the users authority to operate the equipment. THIS DOCUMENT This work is licensed under the Creative Commons
7、 Attribution-Share Alike 3.0 Unported License. To view a copy of this license, visit http:/creativecommons.org/licenses/by- sa/3.0/ or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA. All derivative works are to be attributed to Gerald Coley of
8、BeagleBoard.org. For more information, see http:/creativecommons.org/license/results- one?license_code=by-sa For any questions, concerns, or issues submit them to geraldBeagleBoard.org REF: BBONE_SRM BeagleBone System Reference Manual RevA5.0.0 Page 3 of 83 BEAGLEBONE DESIGN These design materials r
9、eferred to in this document are *NOT SUPPORTED* and DO NOT constitute a reference design. Only “community” support is allowed via resources at BeagleBoard.org/discuss. THERE IS NO WARRANTY FOR THE DESIGN MATERIALS, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING TH
10、E COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE DESIGN MATERIALS “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF
11、 THE DESIGN MATERIALS IS WITH YOU. SHOULD THE DESIGN MATERIALS PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. We mean it; these design materials may be totally unsuitable for any purposes. REF: BBONE_SRM BeagleBone System Reference Manual RevA5.0.0 Page 4 of 8
12、3 BeagleBoard.org provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by BeagleBoard.org to be a finished end-product fit for general consumer use.
13、 Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safet
14、y and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (W
15、EEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives. Should this evaluation board/kit not meet the specifications indicated in the Users Guide, the board/kit may be returned within 30 days from the date of delivery for a full ref
16、und to the distributor form which you purchased the board. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. The user assu
17、mes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies BeagleBoard.org from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the users responsibility to take any and all appropriate pre
18、cautions with regard to electrostatic discharge. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. BeagleBoard.org currently deals with a variety of customers for products, and therefore
19、our arrangement with the user is not exclusive. BeagleBoard.org assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Please read the System Reference Manual and, specifically, the Warnings and Restri
20、ctions notice in the Users Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on BeagleBoard.org environmental and/or safety programs, please visit BeagleBoard.org. No license is granted under any patent
21、right or other intellectual property right of BeagleBoard.org covering or relating to any machine, process, or combination in which such BeagleBoard.org products or services might be or are used. Mailing Address: BeagleBoard.org 1380 Presidential Dr. #100 Richardson, TX 75081 U.S.A. REF: BBONE_SRM B
22、eagleBone System Reference Manual RevA5.0.0 Page 5 of 83 WARRANTY: The BeagleBoard is warranted against defects in materials and workmanship for a period of 90 days from purchase. This warranty does not cover any problems occurring as a result of improper use, modifications, exposure to water, exces
23、sive voltages, abuse, or accidents. All boards will be returned via standard mail if an issue is found. If no issue is found or express return is needed, the customer will pay all shipping costs. Before returning the board, please visit BeagleBoard.org/support Please refer to section 9 of this docum
24、ent for the board checkout procedures. To return a defective board, please request an RMA at http:/beagleboard.org/support/rma Please DO NOT return the board without approval from the RMA team first. REF: BBONE_SRM BeagleBone System Reference Manual RevA5.0.0 Page 6 of 83 Table of Contents FIGURES .
25、 8 TABLES . 9 1.0 INTRODUCTION . 11 2.0 CHANGE HISTORY 11 2.1 CHANGE HISTORY . 11 2.2 REV A4 VS. A5 12 2.2.1 PCB Changes 12 2.2.2 Design Changes . 12 2.2.3 Production Changes 12 2.3 REV A3 VS. A4 13 2.3.1 PCB Changes 13 2.3.2 Design Changes . 13 3.0 BEAGLEBONE OVERVIEW 14 3.1 BEAGLEBONE EXPANSION .
26、14 3.2 BEAGLEBONE DESIGN MATERIAL . 14 3.3 IN THE BOX . 14 4.0 BEAGLEBONE FEATURES AND SPECIFICATION . 15 4.1 BOARD COMPONENT LOCATIONS 16 4.2 BOARD CONNECTOR AND INDICATOR LOCATIONS 18 5.0 BEAGLEBONE DESIGN SPECIFICATION. 20 5.1 PROCESSOR 20 5.2 MEMORY . 20 5.3 POWER MANAGEMENT 20 5.4 PC USB INTERF
27、ACE 20 5.4.1 Serial Debug Port 21 5.4.2 JTAG Port . 21 5.4.3 USB0 Port . 21 5.5 MICROSD CONNECTOR . 21 5.6 USB1 PORT . 21 5.7 USB CLIENT PORT . 21 5.8 POWER SOURCES . 22 5.9 RESET BUTTON 22 5.10 INDICATORS 22 5.11 CTI JTAG HEADER 22 6.0 EXPANSION INTERFACE . 23 6.1 MAIN BOARD EXPANSION HEADER . 23 6
28、.2 CAPE EXPANSION BOARDS 23 6.3 EXPOSED FUNCTIONS 24 6.3.1 LCD . 24 6.3.2 GPMC 24 6.3.3 MMC1 24 6.3.4 SPI . 24 6.3.5 I2C . 25 6.3.6 Serial Ports 25 6.3.7 A/D Converters 25 6.3.8 GPIO . 25 6.3.9 CAN Bus 25 REF: BBONE_SRM BeagleBone System Reference Manual RevA5.0.0 Page 7 of 83 6.3.10 TIMERS 25 6.3.1
29、1 PWM . 26 7.0 DETAILED BOARD DESIGN . 27 7.1 SYSTEM BLOCK DIAGRAM . 27 7.2 PROCESSOR 27 7.2.1 Processor Block Diagram . 28 7.3 SYSTEM POWER . 29 7.3.1 TPS65217B PMIC . 29 7.3.2 5V DC Power Input . 32 7.3.3 USB Power 32 7.3.1 Power Source Selection . 33 7.3.2 Power Consumption 33 7.3.3 Power Sequenc
30、ing . 34 7.3.4 TPS65217B Power Up . 34 7.3.5 Voltage Rails . 35 7.3.6 Power Indicator LED 36 7.3.7 Expansion 3.3V LDO . 37 7.4 CURRENT MEASUREMENT . 37 7.4.1 SYS_5V Connection . 37 7.4.2 SYS_VOLT Connection 38 7.4.3 MUX_OUT Connection . 38 7.4.4 Current Calculation 38 7.5 TWO PORT USB HUB 38 7.5.1 P
31、rocessor USB Port 39 7.5.2 HUB Power . 39 7.5.3 Crystal and Reset. 39 7.5.4 FT2232H Serial Adapter . 40 7.5.5 Processor USB Port 40 7.6 FT2232H USB TO SERIAL ADAPTER . 41 7.6.1 EEPROM . 41 7.6.2 JTAG 42 7.6.3 Serial Port . 42 7.7 256MB DDR2 MEMORY . 42 7.7.1 DDR 2 Design . 43 7.7.2 DDR VTP Terminati
32、on Resistor 44 7.7.3 User LEDs . 44 7.8 10/100 ETHERNET 45 7.8.1 Ethernet PHY Design 45 7.8.2 Processor Signal Description 46 7.8.3 Clocking Mode 47 7.8.4 PHY Mode . 47 7.8.5 MDIO Interface . 48 7.8.6 PHY Reset 49 7.8.7 Status LEDs . 49 7.8.8 Power 49 7.9 USB HOST . 49 7.9.1 USB Host design 49 7.10
33、SD CONNECTOR 50 7.11 EEPROM . 51 7.12 ADC INTERFACE . 52 7.12.1 ADC Inputs . 53 7.12.2 VDD_ADC Interface . 53 7.13 EXPANSION HEADERS . 54 7.13.1 Expansion Header P8 . 54 REF: BBONE_SRM BeagleBone System Reference Manual RevA5.0.0 Page 8 of 83 7.13.2 P8 Signal Pin Mux Options . 55 7.13.3 Expansion He
34、ader P9 . 59 7.13.4 PMIC Expansion Header 64 7.13.5 Backlight Interface . 64 7.13.6 Battery Interface . 65 8.0 CAPE BOARD SUPPORT . 66 8.1 EEPROM 66 8.1.1 EEPROM Address . 67 8.1.2 I2C Bus 67 8.1.3 EEPROM Data Format . 68 8.1.4 Pin Usage 69 8.1.5 EEPROM Write Protect 71 8.2 EXPANSION CONNECTORS . 72
35、 8.2.1 Non-Stacking Headers-Single Cape . 72 8.2.2 Battery Connector- Single . 73 8.2.3 Main Expansion Headers-Stacking . 74 8.2.4 Battery Connector Stacking . 75 8.2.5 Stacked Capes w/Signal Stealing . 75 8.3 SIGNAL USAGE 76 8.4 CAPE POWER . 76 8.4.1 Main Board Power 76 8.4.2 Expansion Board Extern
36、al Power . 77 8.4.3 Mechanical 77 8.4.4 Standard Cape Size . 77 8.4.5 Extended Cape Size . 78 9.0 BOARD SETUP . 79 9.1 CREATING A SD CARD 79 9.2 USB POWERED SETUP . 79 9.3 DC POWERED SETUP . 79 9.4 ADVANCED TEST . 80 9.4.1 Equipment Needed . 81 9.4.2 Procedure 81 9.4.3 Debugging . 81 10.0 BEAGLEBONE
37、 MECHANICAL SPECIFICATION . 82 11.0 DESIGN INFORMATION. 83 Figures Figure 1. Top Side Components . 16 Figure 2. Bottom Side Components . 17 Figure 3. Board Connector and Indicators . 18 Figure 4. Main Board Expansion Connector 23 Figure 5. System Block Diagram . 27 Figure 6. Processor Block Diagram
38、. 28 Figure 7. Power Subsection Block Diagram 29 Figure 8. TPS65217B Block Diagram . 31 Figure 9. 5V DC Power Input 32 Figure 10. USB Power Input 33 REF: BBONE_SRM BeagleBone System Reference Manual RevA5.0.0 Page 9 of 83 Figure 11. Power Sequencing . 34 Figure 12. RTC_PORZ Control . 35 Figure 13. E
39、xpansion 3.3V Regulator 37 Figure 14. Current Measurement 38 Figure 15. USB HUB Design . 39 Figure 16. FT2232H Design . 41 Figure 17. DDR Device Block Diagram 43 Figure 18. DDR Design 43 Figure 19. User LEDS 44 Figure 20. 10/100 Ethernet PHY Design 46 Figure 21. 10/100 Ethernet PHY Default Settings
40、. 48 Figure 22. USB Host Design 50 Figure 23. SD Connector Design . 51 Figure 24. EEPROM Design 52 Figure 25. PMIC Expansion Header 64 Figure 26. Backlight Circuitry 64 Figure 27. Battery Circuitry . 65 Figure 28. Expansion Board EEPROM 66 Figure 29. Single Expansion Connector . 72 Figure 30. Single
41、 Cape Expansion Connector 73 Figure 31. Battery/Backlight Expansion Connector . 73 Figure 32. Expansion Connector 74 Figure 33. Stacked Cape Expansion Connector . 74 Figure 34. Stacked Battery Expansion Connector 75 Figure 35. Stacked w/Signal Stealing Expansion Connector . 76 Figure 36. Cape Board
42、Dimensions 78 Figure 37. Board Top Profile . 82 Figure 38. Board Bottom Profile 82 Tables Table 1. Change History . 11 Table 2. BeagleBone Features 15 Table 3. BeagleBone Power Consumption(mA5V) 33 Table 4. DDR Addressing . 42 Table 5. User LED Control . 45 Table 6. Processor Ethernet Signals 47 Tab
43、le 7. EEPROM Contents . 52 Table 8. Expansion Header P8 Pinout 54 Table 9. P8 Mux Options Modes 0-3 55 Table 10. P8 Mux Options Modes 4-7 57 Table 11. Expansion Header P9 Pinout 59 Table 12. P9 Mux Options Modes 0-3 . 60 Table 13. P9 Mux Options Modes 4-7 . 62 Table 14. Expansion Board EEPROM 68 Tab
44、le 15. EEPROM Pin Usage . 69 REF: BBONE_SRM BeagleBone System Reference Manual RevA5.0.0 Page 10 of 83 Table 16. Single Cape Connectors 73 Table 17. Single Cape Backlight Connectors . 74 Table 18. Stacked Cape Connectors . 75 Table 19. Stacked Cape Connectors . 75 Table 20. Expansion Voltages 76 REF
45、: BBONE_SRM BeagleBone System Reference Manual RevA5.0.0 Page 11 of 83 1.0 Introduction This document is the System Reference Manual for the BeagleBone. It covers revision A3 and revision A4. It is intended as a guide to assist anyone purchasing or who are considering purchasing the board to underst
46、and the overall system design and the features of the BeagleBone. It can also be used as a reference for the design for those who are implementing this design into their own product. This design is subject to change without notice as we will work to keep improving the design as the product matures.
47、2.0 Change History 2.1 Change History Table 1. Change History Rev Changes Date By 0.1 Original Release for review November 4, 2011 GC 0.2 1. Added notch dimension to the Cape board outline. 2. Added power numbers to features table. 3. Corrected USB0 and USB1 numbering 4. Made correction on two signa
48、ls on Tables 10 thru 12. November 11, 2011 GC A4.0. 4 1. Rev A4 Release 2. Documented the changes. 3. Updated Figure 28 to show pullup resistors as 5.6K. 4. Added note to Cape section that mounting holes are not required. 5. Fixed link to the TPS65217B documentation. 6. Added section on ADC interfac
49、e. January 3, 2012 GC A5 1. Added clarification on image creation process. 2. Added more detail on USB 5VDC supplied to Capes. 3. Corrected section 6.3.6 to reflect four UART ports instead of five. 4. Updated Figure 36 with more hole dimensions. 5. Added section on the rev A4 to Rev A5 changes. 6. Made changes in Table 12. 7. Added note on polarity of Yellow Ethernet LED in section 7.8.7. January 31, 2012 GC REF: BBONE_SRM BeagleBone System Reference Manual RevA5.0.0 Page 12 of 83 2.2 Rev A