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REF: BB_SRM_xM BeagleBoard-xM System
Reference Manual
Revision A2
Page 69 of 164
8.10.9 GPIO Mapping
There are a number of GPIO pins from the processor that are used on the BeagleBoard
design. Table 5 shows which of these GPIO pins are used in the design and whether they
are inputs or outputs. While GPIO pins can be used as interrupts, the table only covers the
GPIO pin mode. If it is an interrupt, then it is covered in the interrupt section.
Table 5. Processor GPIO Pins
OMAP
PIN
INT/GPIO I/O Signal USAGE
AA9 GPIO_149 O LED_GPIO149 Controls User LED0
W8 GPIO_150 O LED_GPIO149 Controls User LED1
AG9 GPIO_23 I MMC1_WP SD/MMC card slot Write protect
J25 GPIO_170 O DVI_PUP Controls the DVI-D interface. A Hi = DVI-D enabled.
AE21 GPIO_7 I SYSBOOT_5 Used to put the device in the boot mode or as a user button
input
Other signals, such as those that connect to the expansion connector, may also be set as a
GPIO pin. For information on those, refer to the Expansion Connector section.
8.10.10 Interrupt Mapping
There are a small number of pins on the processor that act as interrupts. Some of these
interrupts are connected to the TPS65950 and their status is reflected through the main
TPS65950 interrupt. Table 6 lists the interrupts.
Table 6. Processor Interrupt Pins
TPS65950
Pin
Processor
PIN
INT/GPIO USAGE
AF26 SYS_nIRQ Interrupt from the TPS65950
AH8 GPIO_29 SD Write protect lead. Can be polled or set to an
interrupt.
P12 GPIO0 MMC1 card detect input. Goes to the processor over the
SYS_nIRQ pin.
- 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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