CME-Atom User Manual 1.2
www.diamondsystems.com
Page 16
4.1
COM Express AB Connector
The 2x110-pin, high-density COM Express AB connector implements the
board‟s USB, PCI Express, SATA,
LVDS, LPC, AC97 (audio), VGA (CRT), LAN, power and ground interfaces, and system and power management,
as indicated in the table below. Further information regarding each of these signal groups follows the table. (Note:
Pins designated “NC” should be left unconnected.)
GND
B1
A1
GND
USB7-
B36
A36
USB6-
GBE0_ACT#
B2
A2
GBE0_MDI3-
USB7+
B37
A37
USB6+
LPC_FRAME#
B3
A3
GB
USB_4_5_OC#
B38
A38
USB_6_7_OC#
LPC_AD0
B4
A4
GBE0_LINK100#
USB5-
B39
A39
USB4-
LPC_AD1
B5
A5
GBE0_LINK1000#
USB5+
B40
A40
USB4+
LPC_AD2
B6
A6
GBE0_MDI2-
GND
B41
A41
GND
LPC_AD3
B7
A7
GB
USB3-
B42
A42
USB2-
LPC_DRQ0#
B8
A8
NC
USB3+
B43
A43
USB2+
LPC_DRQ1#
B9
A9
GBE0_MDI1-
USB_0_1_OC#
B44
A44
USB_2_3_OC#
LPC_CLK
B10
A10
GB
USB1-
B45
A45
USB0-
GND
B11
A11
GND
USB1+
B46
A46
USB0+
PWRBTN#
B12
A12
GBE0_MDI0-
EXCD1_PERST#
B47
A47
VCC_RTC
SMB_CK
B13
A13
GB
EXCD1_CPPE#
B48
A48
EXCD0_PERST#
SMB_DAT
B14
A14
GBE0_CTREF
SYS_RESET#
B49
A49
EXCD0_CPPE#
SMB_ALERT#
B15
A15
SUS_S3#
CB_RESET#
B50
A50
LPC_SERIRQ
NC
B16
A16
S
GND
B51
A51
GND
NC
B17
A17
SATA0_TX-
NC
B52
A52
NC
SUS_STAT#
B18
A18
SUS_S4#
NC
B53
A53
NC
NC
B19
A19
S
GPO1
B54
A54
GPI0
NC
B20
A20
SATA0_RX-
NC
B55
A55
NC
GND
B21
A21
GND
NC
B56
A56
NC
NC
B22
A22
S
GPO2
B57
A57
GND
NC
B23
A23
SATA2_TX-
NC
B58
A58
NC
PWR_OK
B24
A24
SUS_S5#
NC
B59
A59
NC
NC
B25
A25
S
GND
B60
A60
GND
NC
B26
A26
SATA2_RX-
P
B61
A61
P
WDT
B27
A27
BATLOW#
PCIE_RX2-
B62
A62
PCIE_TX2-
AC_SDIN2
B28
A28
ATA_ACT#
GPO3
B63
A63
GPI1
AC_SDIN1
B29
A29
AC_SYNC
P
B64
A64
P
AC_SDIN0
B30
A30
AC_RST#
PCIE_RX1-
B65
A65
PCIE_TX1-
GND
B31
A31
GND
WAKE0#
B66
A66
GND
SPKR
B32
A32
AC_BITCLK
WAKE1#
B67
A67
GPI2
I2C_CK
B33
A33
AC_SDOUT
P
B68
A68
P
I2C_DAT
B34
A34
BIOS_DISABLE#
PCIE_RX0-
B69
A69
PCIE_TX0-
THRM#
B35
A35
THRMTRIP#
GND
B70
A70
GND