User`s guide

Signal Descriptions and Pinout Tables7

The following section describes the signals found on COM Express™ Type II connectors used for congatec AG modules.

Table 2 describes the terminology used in this section for the Signal Description tables. The PU/PD column indicates if a COM Express™

module pull-up or pull-down resistor has been used, if the eld entry area in this column for the signal is empty, then no pull-up or pull-down

resistor has been implemented by congatec.

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.

Note

The Signal Description tables do not list internal pull-ups or pull-downs implemented by the chip vendors, only pull-ups or pull-downs implemented

by congatec are listed. For information about the internal pull-ups or pull-downs implemented by the chip vendors, refer to the respective chip’s

datasheet.

Table 2 Signal Tables Terminology Descriptions

Term Description

PU congatec implemented pull-up resistor

PD congatec 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 Specication, Revision 1.1

SATA In compliance with Serial ATA specication, 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.