
cExpress-AR User’s Guide PICMG COM.0 R3.0
Page 8 Copyright © 2021 ADLINK Technology, Inc.
4.3.10 Miscellaneous....................................................................................................................................................................................................................................................................................................................37
4.3.11 SMBus ..................................................................................................................................................................................................................................................................................................................................38
4.3.12 I2C bus.................................................................................................................................................................................................................................................................................................................................38
4.3.13 General Purpose I/O (GPIO).........................................................................................................................................................................................................................................................................................39
4.3.14 Serial Interface Signals...................................................................................................................................................................................................................................................................................................39
4.3.15 Power and System Management...............................................................................................................................................................................................................................................................................40
4.3.16 Power and Ground ..........................................................................................................................................................................................................................................................................................................41
4.4. CD Connector Signal Descriptions.........................................................................................................................................................................................................................................................................................42
4.4.1 USB 3.0 Extensions ..........................................................................................................................................................................................................................................................................................................42
4.4.2 PCI Express .........................................................................................................................................................................................................................................................................................................................43
4.4.3 DDI1 Port ............................................................................................................................................................................................................................................................................................................................45
4.4.4 DDI2 Port ............................................................................................................................................................................................................................................................................................................................48
4.4.5 DDI3 Port ............................................................................................................................................................................................................................................................................................................................51
4.4.6 PCIe Graphics Port (PEG)...............................................................................................................................................................................................................................................................................................54
4.4.7 Module Type Definition.................................................................................................................................................................................................................................................................................................56
4.4.8 Power and Ground ..........................................................................................................................................................................................................................................................................................................57
5. Additional Features.................................................................................................................................................................................................................................................................................................58
5.1. Debug Connector ........................................................................................................................................................................................................................................................................................................................59
5.2. Status LEDs.....................................................................................................................................................................................................................................................................................................................................60
5.3. Exception Codes...........................................................................................................................................................................................................................................................................................................................61
5.4. Fan Connector...............................................................................................................................................................................................................................................................................................................................62
5.5. BIOS Default Reset Button........................................................................................................................................................................................................................................................................................................63
5.6. BIOS Boot Select...........................................................................................................................................................................................................................................................................................................................64
6. BIOS Checkpoints, Beep Codes..........................................................................................................................................................................................................................................................................65
7. Software Support.....................................................................................................................................................................................................................................................................................................66
7.1. Operating Systems ......................................................................................................................................................................................................................................................................................................................66
8. Mechanical and Thermal.......................................................................................................................................................................................................................................................................................67
8.1. Module Dimensions....................................................................................................................................................................................................................................................................................................................67
8.2. Thermal Solutions........................................................................................................................................................................................................................................................................................................................68
8.2.1 Heatspreader: HTS...........................................................................................................................................................................................................................................................................................................68
8.2.2 Heatsink: THS ....................................................................................................................................................................................................................................................................................................................69
8.2.3 Heatsink High Profile: THSH ........................................................................................................................................................................................................................................................................................70
8.2.4 Heatsink with Fan: THSF................................................................................................................................................................................................................................................................................................71