
REF: BB_SRM_xM BeagleBoard-xM System
Reference Manual
Revision A2
Page 6 of 164
7.3 CONNECTING DC POWER............................................................................................................32
7.4 CONNECTING JTAG....................................................................................................................33
7.5 CONNECTING SERIAL CABLE ......................................................................................................34
7.6 CONNECTING S-VIDEO................................................................................................................35
7.7 CONNECTING DVI-D CABLE.......................................................................................................36
7.8 CONNECTING STEREO OUT CABLE..............................................................................................37
7.9 CONNECTING STEREO IN CABLE .................................................................................................38
7.10 INDICATOR LOCATIONS...............................................................................................................39
7.11 BUTTON LOCATIONS ...................................................................................................................40
7.12 MICROSD CONNECTION ..............................................................................................................41
7.13 LCD CONNECTION......................................................................................................................42
8.0 BEAGLEBOARD SYSTEM ARCHITECTURE AND DESIGN.............................................43
8.1 SYSTEM BLOCK DIAGRAM ..........................................................................................................43
8.2 OVER VOLTAGE PROTECTION .....................................................................................................45
8.2.1 Detection ...............................................................................................................................46
8.2.2 Indication ..............................................................................................................................46
8.2.3 Shutdown ...............................................................................................................................46
8.3 POWER CONDITIONING ...............................................................................................................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
8.4 METER CURRENT MEASUREMENT ..............................................................................................50
8.5 PROCESSOR CURRENT MEASUREMENT .......................................................................................50
8.6 VBAT POWER CONDITIONING....................................................................................................52
8.7 TPS65950 RESET AND POWER MANAGEMENT ...........................................................................53
8.7.1 Main Core Voltages...............................................................................................................53
8.7.2 Main DC Input.......................................................................................................................53
8.7.3 Processor I2C Control ..........................................................................................................53
8.7.4 VIO_1V8................................................................................................................................53
8.7.5 Main Core Voltages Smart Reflex .........................................................................................56
8.7.6 VOCORE_1V3.......................................................................................................................56
8.7.7 VDD2.....................................................................................................................................56
8.8 PERIPHERAL VOLTAGES..............................................................................................................57
8.8.1 VDD_PLL2............................................................................................................................57
8.8.2 VDD_PLL1............................................................................................................................58
8.8.3 VDAC_1V8 ............................................................................................................................58
8.8.4 VDD_SIM ..............................................................................................................................59
8.8.5 VMMC2 .................................................................................................................................59
8.8.6 VDD_VMMC1 .......................................................................................................................59
8.8.7 CAM_2V8 ..............................................................................................................................59
8.8.8 CAM_1V8 ..............................................................................................................................59
8.8.9 USB_1V8 ...............................................................................................................................59
8.8.10 EXP_VDD.........................................................................................................................60
8.9 OTHER SIGNALS..........................................................................................................................60
8.9.1 Boot Configuration................................................................................................................60
8.9.2 RTC Backup Battery..............................................................................................................60
8.9.3 Power Sequencing .................................................................................................................61
8.9.4 Reset Signals .........................................................................................................................62
8.9.5 mSecure Signal......................................................................................................................63
8.10 PROCESSOR.................................................................................................................................64
8.10.1 Overview...........................................................................................................................64
8.10.2 SDRAM Bus ......................................................................................................................65
8.10.3 GPMC Bus........................................................................................................................65
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