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BDM-610000082 Rev A Chapter 4: Using the cpuModule 67
Power Management
The CMX34GS cpuModule supports various powering mechanisms which allow the cpuModule to monitor
power consumption and temperature, and achieve minimal power consumption states. These unique features
include thermal monitoring and thermal throttling, as well as low power modes including ACPI configurations.
Various wake options are also available to resume normal system power.
Advanced Configuration and Power Interface (ACPI)
The cpuModule supports several different ACPI low power modes, including the S3, S4, and S5 sleeping states.
These suspend modes are described below:
•
S3 (Suspend to RAM): Everything in the system is powered off except for the system memory. When
the system wakes from this mode, operating systems allow applications to resume where they left off,
as the state of the application is preserved in memory.
•
S4 (Hibernate): When the system enters this state, the operating system will save the current state of
applications and relevant data to disk, thus allowing the system RAM to be powered down.
•
S5 (Soft-Off): The system is in a soft off state, and must be rebooted when it wakes.
Power Button Modes
The soft power button input of the Utility Port 2.0 connector (CN5) can be configured by the operating system
as a suspend button (transition to S3) or as soft power button (transition to S5). Consult your operating system
documentation for information on how to configure it. The power button will always cause a transition to S5 if
pressed for 4 seconds or longer, without interaction from the operating system.
The soft power button of the Utility Port 2.0 connector (CN5) is the only mechanism to wake the system from
S4 and S5.
Low-Power Wake Options
The cpuModule supports several methods of waking from a low power state.
•
Resume from USB: Operating systems that support S3 permit waking the system from the USB
interfaces. Common USB wake methods include insertion of a USB device, a USB keyboard stroke, or
movement from another USB device, such as mouse.
•
Resume on RTC Alarm / Timeout: The RTC Alarm allows the system to turn on at a certain time every
day.
•
Resume on WAKE#: The system can wake when a signal is applied to the WAKE# signal on the
PCIe/104 Type 2 connectors (CN1 & CN2).
Note When the reset button of the Utility Port 2.0 connector is configured as a power button (via the
BIOS setup utility), it inherits the ACPI suspend and resume features of the power button.
Table 44 Supported ACPI Resume/Wake Mechanisms
Resume/Wake Mechanism S3 S4 S5
Wake from USB Y — —
Wake from RTC Alarm / Timeout Y — —
Wake from WAKE# (CN1 & CN2)Y——
Power Button Input (CN5) YYY
- CMX34GS cpuModules™ 1
- Revision History 2
- Table of Contents 5
- Appendix A Hardware Reference 7
- Appendix B Troubleshooting 7
- Chapter 1 Introduction 9
- CMX34GS cpuModules 10
- Ordering Information 12
- Board Features 13
- RTD Enhanced BIOS 15
- Block Diagram 16
- Specifications 17
- Operating Conditions 18
- Electrical Characteristics 19
- New I/O Connectors 21
- Connector Differences 21
- UEFI Shell 22
- Contact Information 23
- Chapter 2 Getting Started 25
- Connector Locations 26
- Stack Example 29
- Connecting to the Stack 30
- Power Input Connections 30
- Proper Grounding Techniques 34
- Auxiliary Power (CN3) 36
- USB 2.0 Connector 37
- System Reset 38
- Soft Power Button 38
- SVGA Video Connector (CN18) 40
- DisplayPort Connector (CN19) 41
- 191715131197531 42
- 2018161412108642 42
- Serial Port UART 43
- RS-232 Serial Port (Default) 43
- RS-422 or RS-485 Serial Port 44
- RS-422 Mode Pinout 45
- RS-485 Mode Pinout 46
- Dual Serial Port Modes 47
- Table 23 aDIO Pinout 49
- Table 24 USB Connector (CN17) 50
- Table 25 USB Connector (CN27) 50
- PCIe/104 Type 2 Compatibility 55
- Pin Signal Function 56
- 1 BAT RTC Battery Input 56
- 2GNDGround 56
- Chapter 4 Using the cpuModule 57
- The RTD Enhanced BIOS 58
- Main Menu Setup Fields 59
- Boot Device Selection Menu 59
- Windows® 60
- Memory Map 61
- I/O Address Map 62
- Hardware Interrupts 63
- Digital I/O Register Set 64
- 0 no mask, 1 mask 10 DIO mask 65
- Advanced Digital Interrupts 66
- Event Mode 66
- Match Mode 66
- Strobe Mode 67
- SATA Controller Configuration 68
- Legacy Mode 69
- Real Time Clock Control 70
- Watchdog Timer Control 73
- Thermal Management 74
- Power Management 75
- Performance States (P-states) 76
- AT vs. ATX Power Supplies 76
- ATX Power Supply Signals 76
- Reducing Power Consumption 76
- Multi-Color LED 77
- Reset Status Register 78
- System Recovery 81
- Jumper Settings and Locations 84
- Onboard PCI/PCIe Devices 85
- Physical Dimensions 86
- Common Problems and Solutions 88
- IDAN Contents 93
- External I/O Connections 94
- 2.HDMI mode only 97
- Application Notes 99
- Drivers and Example Programs 99
- Interrupt Programming 99
- Serial Port Programming 99
- PC/104 Specifications 99
- Appendix E Limited Warranty 101
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