Kontron COMe Starterkit Eval T2 - Manual (Page 14)

Preface
1.9. Signal Table Terminology
Table 2 below describes the terminology used in this section for the Signal Description tables.
The “#” symbol at the end of the signal name indicates that the active or asserted state
occurs when the signal is at a low voltage level.
When “#” is not present, the signal is asserted
when at a high voltage level.
The terms “Input” and “Output” and their abbreviations in Table 2 below refer to the Module's view, i.e.
an input is an input for the Module and not for the Carrier-Board.
Table 2: Signal Table Terminology Descriptions
Term Description
I/O 3.3V Bi-directional signal 3.3V tolerant
I/O 5V Bi-directional signal 5V tolerant
I 3.3V Input 3.3V tolerant
I 5V Input 5V tolerant
I/O 3V3_SBY Bi-directional 3.3V tolerant active during Suspend and running state.
O 3.3V Output 3.3V signal level
O 5V Output 5V signal level
OD Open drain output
P Power input/output
*_S0 Signal active during running state.
PCIE In compliance with PCI Express Base Specification
USB In compliance with the Universal Serial Bus Specification
GbE In compliance with IEEE 802.3ab 1000BASE-T Gigabit Ethernet
SATA In compliance with Serial ATA specification
REF Reference voltage output. May be sourced from a Module power plane.
PDS Pull-down strap. A Module output pin that is either tied to GND or is not connected. Used to signal
Module capabilities (pin-out type) to the Carrier Board.
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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