User's Manual l TQMx50UC UM 0101 l © 2018 TQ-Group
Page 14
3.6
Connectors
3.6.1
COM Express™ Connector
Two 220-pin 0.5 mm pitch receptacle connectors are used to interface the TQMx50UC on the carrier board.
On the carrier board two 220-pin 0.5 mm pitch plug connectors must be used. There are two versions with 5 mm and 8 mm stack
height available.
3.6.2
Debug Header
The TQMx50UC provides a 14-pin flat cable connector to connect an external debug module (TQ specific) providing BIOS post
code information, debug LEDs and a JTAG interface for on-board FPGA.
This header is for TQ internal use only.
Please contact
TQ-Support
for more details about the external debug module.
3.6.3
Debug Module LED
The TQMx50UC provides a dual colour LED providing boot and BIOS information.
The following table illustrates some LED boot messages:
Table 8:
LED boot messages
Red LED
Green LED
Remark
ON
OFF
Power supply error
ON
ON
S4/S5 state
BLINKING
BLINKING
S3 state
OFF
BLINKING
uEFI BIOS is booting
OFF
ON
uEFI BIOS boot is finished
3.7
COM Express™ Connector Pinout List
This section describes the TQMx50UC COM Express™ connector pin assignment, which is compliant with COMR.0 R2.1 Type 6
pinout definitions.
3.7.1
Signal Assignment Abbreviations
The following table lists the abbreviations used within this chapter:
Table 9:
Signal Assignment Abbreviations
Abbreviation
Description
GND
Ground
PWR
Power
I
Input
I PU
Input with pull-up resistor
I PD
Input with pull-down resistor
O
Output
OD
Open drain output
I/O
Bi-directional
Note: Unused signals on the carrier board
If the input signals at the COM Express™ connector are not used, these signals can be left open
on the carrier board, since these signals have a termination on the TQMx50UC.
