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COM Express® Carrier Board Design Guide
2.18.3 Power Management Signals
Table 19:
System States S0-S5 Definitions
System State
Description
Power Rail State
S0
Full On
All components are powered and the
system is fully functional.
Full power on all power rails.
S1
Power-on Standby
(POS)
In sleeping state, no system context is lost,
hardware maintains all system context.
During S1 operation some system
components are set into low power state.
Full power on all power rails.
S2
Not supported.
S3
Suspend to RAM
(STR)
The current system state and context is
stored in main memory and all unnecessary
system logic is turned off.
Only main memory and logic required to
wake-up the system remain powered by
the Suspend voltages. All other power
rails are switched off.
S4
Suspend to Disk
(STD) Hibernate
The current system state and context is stored
on disk and all unnecessary system logic is
turned off. S4 is similar to S5 and just
supported by OS.
Similar to S5; All other power rails are
switched off.
S5
Soft Off
In S5 state the system is switched off.
Restart is only possible with the power
button or by a system wake-up event such
as 'Wake On LAN' or RTC alarm.
Suspend power rails are powered. All
other power rails are switched off.
Summary of Contents for ET976
Page 1: ...COM EXPRESS CARRIER BOARD DESIGN GUIDE Version 1 0 January 2022...
Page 11: ...COM Express Carrier Board Design Guide 5 Figure 3 PCI Express x4 Slot Example...
Page 12: ...6 COM Express Carrier Board Design Guide Figure 4 PCIe Mini Card Reference Circuitry...
Page 19: ...COM Express Carrier Board Design Guide 13 Figure 7 HDMI Example 1...
Page 20: ...14 COM Express Carrier Board Design Guide Figure 7 HDMI Example 2...
Page 21: ...COM Express Carrier Board Design Guide 15 Figure 8 DVI Example 1...
Page 22: ...16 COM Express Carrier Board Design Guide Figure 8 DVI Example 2...
Page 31: ...COM Express Carrier Board Design Guide 25 Figure 12 USB 3 0 Example 2...
Page 37: ...COM Express Carrier Board Design Guide 31 Figure 14 LVDS Reference Schematic 2...
Page 44: ...38 COM Express Carrier Board Design Guide Figure 16 VGA Reference Schematics 2...
Page 48: ...42 COM Express Carrier Board Design Guide Figure 18 HDA Example Schematic 2...
Page 52: ...46 COM Express Carrier Board Design Guide Figure 19 LPC Super I O Example 2...
Page 61: ...COM Express Carrier Board Design Guide 55 Figure 24 General Purpose Serial Port Example 2...
Page 70: ...64 COM Express Carrier Board Design Guide Figure 28 PWRBTN and SYS_RESET Circuitry...
Page 84: ...78 COM Express Carrier Board Design Guide Chapter 4 Carrier Board PCB Layout Guidelines...
