
ACM-XE21B6
9
www.acrosser.com
2.2. Connector Pin Definition
CCMOS1
CMOS Memory Clearing Pads
Short these two soldering pads and then open to reset PCH
registers in the RTC well to default value.
PADS Signal
Short
Clear CMOS
Open
Normal
SO-DIMM1, SO-DIMM2
ECC DDR4 SO-DIMM 260P
CPUFAN1
Fan Connector
Pin # Signal
1
GND
2
+12V
3
FAN Speed Sensor
Header: 3-pin. Pitch: 2.54mm.
CN1, CN2
CN1: COM Express Module Type 6 Connector Rows A/B
CN2: COM Express Module Type 6 Connector Rows C/D
(Refer to the following CN1, CN2 Pin Assignments)
2.2.1.
CN1, CN2 Pin Assignments
Pin #
CN1 – Row A
CN1 – Row B
CN2 – Row C
CN2 – Row D
1
GND(FIXED)
GND(FIXED)
GND(FIXED)
GND(FIXED)
2
GBE0_MDI3-
GBE0_ACT#
GND(FIXED)
GND(FIXED)
3
GB
LPC_FRAME#
USB_SSRX0-
USB_SSTX0-
4
GBE0_LINK100#
LPC_AD0
US
US
5
GBE0_LINK1000#
LPC_AD1
GND(FIXED)
GND(FIXED)
6
GBE0_MDI2-
LPC_AD2
USB_SSRX1-
USB_SSTX1-
7
GB
LPC_AD3
US
US
8
No Connect (Note1)
LPC_DRQ0#
GND(FIXED)
GND(FIXED)
9
GBE0_MDI1-
LPC_DRQ1#
USB_SSRX2-
USB_SSTX2-
10
GB
LPC_CLK
US
US
11
GND(FIXED)
GND(FIXED)
GND(FIXED)
GND(FIXED)
12
GBE0_MDI0-
PWRBTN#
USB_SSRX3-
USB_SSTX3-
13
GB
SMB_CK
US
US