Kontron COMe Starterkit Eval T2 - Manual (Page 15)

Preface
1.10. Schematic Conventions
Schematic examples are drawn with signal directions shown per the figure below. Signals that
connect directly to the COM Express connector are flagged with the text “CEX” in the off-page
connect symbol, as shown in Figure 1 below. Nets that connect to the COM Express Module are
named per the PICMG COM Express specification.
Figure 1: Schematic Conventions
Power nets are labeled per the table below. The power rail behavior under the various system
power states is shown in the table.
Table 3: Naming of Power Nets
Power Net S0
On S3
Suspend to
RAM S4
Suspend to
Disk S5
Soft Off G3
Mechanical
Off
VCC_12V 12V off off off off
VCC_5V0 5V off off off off
VCC_3V3 3.3V off off off off
VCC_1V5 1.5V off off off off
VCC_2V5 2.5V off off off off
VCC_5V_SBY 5V 5V 5V 5V off
VCC_3V3_SBY 3.3V 3.3V 3.3V 3.3V off
VCC_RTC 3.0V 3.0V 3.0V 3.0V 3.0V
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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IC
CEX
CEX CEX
CEX
OUTPUT FROM IC
INPUT TO IC
BIDIR SIGNAL
CEX
CEX
OUTPUT FROM IC TO COM EXPRESS
INPUT TO IC FROM COM EXPRESS
BIDIR SIGNAL TO / FROM COM EXPRESS BIDIR SIGNAL TO / FROM COM EXPRESS
INPUT TO IC FROM COM EXPRESS
OUTPUT FROM IC TO COM EXPRESS
BIDIR SIGNAL
INPUT TO IC
OUTPUT FROM IC