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REF: BB_SRM_xM BeagleBoard-xM System

Reference Manual

Revision A2

Page 40 of 164

7.11 Button Locations

There are two buttons on the BeagleBoard; the RESET button when pressed will force a

board reset and the USER button which can be used by the SW for user interaction.

Figure 15 shows the location of the buttons.

Figure 15. BeagleBoard Button Location

The User button does no affect the boot source of the board as is the case on the rev C4

version.

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 163 164

BeagleBoard-xM Rev A2 1
System Reference Manual 1
Table of Contents 5
Figures 9
Tables 11
1.0 Introduction 13
2.0 Change History 15
2.2.2 Software Changes 16
4.0 BeagleBoard Overview 17
Figure 2. USB Y-Cable 21
6.0 Product Contents 28
7.0 BeagleBoard Hookup 30
BEAGLEBOARD 36
VOLT_ERR 45
8.2.1 Detection 46
8.2.2 Indication 46
8.2.3 Shutdown 46
USB_CLIENT / 47
OTG PORT 47
DC_POWER 47
8.3.1 USB DC Source 48
8.3.2 Wall Supply Source 48
8.3.3 DC Source Control 48
8.3.4 AUX 3.3V Supply 49
Figure 25. Main Power Rails 55
8.7.6 VOCORE_1V3 56
8.7.7 VDD2 56
8.8.1 VDD_PLL2 57
8.8.2 VDD_PLL1 58
8.8.3 VDAC_1V8 58
8.8.10 EXP_VDD 60
8.9.1 Boot Configuration 60
8.9.2 RTC Backup Battery 60
8.9.3 Power Sequencing 61
Figure 27. Power Sequencing 61
8.9.4.3 User Reset 63
8.9.4.4 PWRON 63
8.9.5 mSecure Signal 63
8.10.1 Overview 64
8.10.2 SDRAM Bus 65
8.10.3 GPMC Bus 65
Processor 66
8.10.9 GPIO Mapping 69
8.10.10 Interrupt Mapping 69
Figure 33. POP Memory 70
Figure 34. System Clocks 70
8.12.1 32KHz Clock 71
8.12.2 26MHz Clock 71
8.12.2.1 26MHz Source 71
8.12.2.2 TPS65950 Setup 71
8.12.2.3 Processor 26MHz 71
8.12.3 McBSP_CLKS 72
8.13.1 USB OTG Overview 72
8.13.2 USB OTG Design 73
Figure 35. USB OTG Design 73
8.13.3 OTG ULPI Interface 73
8.13.3.2 TPS65950 Interface 74
8.13.4 OTG Charge Pump 74
8.13.5 OTG USB Connector 75
8.13.6 OTG USB Protection 75
8.14.1 Power 76
8.14.2 HS USB PHY 77
Figure 38. USB PHY Design 78
8.14.3 USB HUB 79
Figure 39. USB HUB Design 80
8.14.4 USB Port Connectors 81
8.14.5 Ethernet 82
8.15.1 microSD Power 83
8.15.2 Processor Interface 83
8.15.3 Card Detect 84
Figure 43. Audio Circuitry 85
8.16.3 Audio Output Jack 86
8.16.4 Audio Input Jack 86
Figure 44. DVI-D Interface 87
8.17.2 LCD Power 89
8.17.3 TFP410 Power 89
8.17.4 TFP410 Framer 89
8.17.6.8 DVI to VGA 93
Table 16. P11 LCD Signals 93
Table 17. P13 LCD Signals 94
8.20.4 Camera Modules 100
Figure 47. Camera Modules 100
8.21.1 Processor Interface 101
8.21.2 Level Translator 101
8.21.3 RS232 Transceiver 102
8.21.4 Connector 102
8.22.1 Power Indicator 103
8.22.2 PMU Status Indicator 103
Figure 49. Indicator Design 103
8.22.3 User Indicators 104
8.22.4 HUB Power Indicator 104
Figure 50. JTAG Interface 105
8.23.1 Processor Interface 105
Table 21. JTAG Signals 105
8.23.2 JTAG Connector 106
8.24.1 Processor Interface 106
8.24.2 Expansion Signals 108
8.24.3 Power 109
8.24.4 Reset 109
8.24.5 Power Control 109
Table 24. P11 GPIO Signals 110
MUX:0 MUX:2 MUX:4 110
Table 25. P13 GPIO Signals 110
8.26.1 MCBSP5 Signals 111
8.26.2 MMC3 Signals 112
8.26.3 ETK Signals 112
8.26.4 HSUSB1 Signals 113
8.26.5 Alternate Clock 113
8.26.6 HDQ 1-Wire 113
8.26.7 ADC 113
8.26.8 GPIO Signals 114
8.26.9 DMAREQ 114
Figure 52. Power Connector 115
Figure 56. DVI-D Connector 118
DVI-D interface itself 118
Figure 57. DVI-D Cable 119
Figure 58. DVI-D Cable 119
9.5.1 Connector Pinout 120
Table 33. P11 LCD Signals 120
Table 34. P13 LCD Signals 121
9.5.2 Camera 122
Figure 60. Camera Connector 123
Figure 61. Camera Module 123
9.5.3 Audio McBSP2 Port 124
9.5.6 Mounting Scenarios 127
Figure 66. Audio In Plug 128
Figure 68. Audio Out Plug 129
Table 39. JTAG Signals 130
9.9.1 Battery 132
Figure 73. Optional Battery 132
9.9.2 Battery Installation 132
Figure 75. Resistor R65 133
Table 41. DC Power Supplies 135
Figure 76. DC Power Supply 135
Figure 79. USB to Bluetooth 138
11.0 Mechanical Information 140
11.2.1 Mounting Method 141
11.2.2 Expansion EEPROM 143
Table 46. Voltages 145
12.1.1 Signal Access Points 146
Table 47. Troubleshooting 147
13.0 Known Issues 148
15.0 Schematics 151
16.0 Bills of Material 163
17.0 PCB Information 164

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