Ampro Corporation COM 830 - Manual (Page 31)

COM 830 Reference Manual 25
Chapter 3 Signals and Pinout Tables
The following section describes the signals found on COM Express™ Type II connectors used for Ampro
modules.
The table below describes the terminology used in this section for the Signal Description tables. The PU/PD
column indicates if a COM Express internal pull-up or pull-down resistor has been used. If the field entry
area in this column for the signal is empty, then no pull-up or pull-down resistor has been implemented.
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.
Table 3-1. Signal Tables Terminology Descriptions
Term Description
PU COM Express internally implemented Pull up resistor
PD COM Express internally implemented Pull down resistor
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 3.3VSB Input 3.3V tolerant active in standby state
O 3.3V Output 3.3V signal level
O 5V Output 5V signal level
OD Open drain output
P Power Input/Output
DDC Display Data Channel
PCIE In compliance with PCI Express Base Specification, Revision 1.0a
SATA In compliance with Serial ATA specification, Revision 1.0a
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 (pinout type) to the Carrier Board.