Seco COM-Express CCOMe-C79 User Manual page 61

BMC Connector
BMC connector CN58
Pin Signal Pin Signal
1 +5V_ALW 2 +3.3V_ALW
3 +5V_ALW 4 +3.3V_ALW
5 +5V_ALW 6 +3.3V_ALW
7 --- 8 GND
9 GND 10 LPC_CLK (N.C.)
11 SMB_CK 12 LPC_RST# (N.C.)
13 SMB_DAT 14 LPC_SERIRQ# (N.C.)
15 GND 16 LPC_AD0 (N.C.)
17 I2C_CK 18 LPC_AD1 (N.C.)
19 I2C_DAT 20 LPC_AD2 (N.C.)
21 GND 22 LPC_AD3 (N.C.)
23 USB3+ 24 LPC_FRAME# (N.C.)
25 USB3- 26 GND
27 GND 28 PCIE_BMC_CLK-
29 NCSI_CLK_IN 30 PCIE_BMC_CLK+
31 NCSI_RXD0 32 GND
33 NCSI_RXD1 34 BMC_CLK_REQ#
35 NCSI_CRS_DV 36 PCIE_BMC_RST#
37 NCSI_TXD0 38 GND
39 NCSI_TXD1 40 PCIE_BMC_RX3+
41 NCSI_ARB_OUT 42 PCIE_BMC_RX3-
43 NCSI_ARB_IN 44 GND
45 NCSI_TX_EN 46 PCIE_BMC_TX3+
47 NCSI_RX_ER 48 PCIE_BMC_TX3-
49 GND 50 GND
CCOMe-C79
CCOMe-C79 - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by E.S. Copyright © 2021 SECO S.p.A.
™
COM Express MC79 Carrier Board expands its functionalities by means of connector CN58, to be
used for plugging Baseboard Management Controller (BMC) modules.
This connector does include multiple interfaces, SM Bus, I2C, LPC Bus, 1x USB 2.0, 1x PCI-e x1, NCSI
signals. CN58, type SAMTEC QStrip
I2C bus coming from COM Express
header (see par.3.3.8) and to the BMC Connector. It is also used to manage
an SO8 EEPROM Socket CN63, for plugging I2C Flash in SO-8 format.
Also LPC bus and SM bus are carried to BCM Connector.
PCI-e lane #3 is shared between PCI-e slot #1 CN12 and BCM connector.
A dedicated 2 way jumper JP6 is used to redirect the PCI-e lane #3.
PCI-e reference clock for BMC is provided by the on Carrier board PCI-e Clock buffer.
Another interface shared with BCM connector is USB 2.0 port #3. This interface is switched using a
jumper JP5 to the BMC Connector.
JP5 position BMC/USB selector
1-2 BMC
2-3 USB Port#3 (CN19)
Signals Description:
SMB_CK: SM Bus control clock line for System Management, bidirectional signal
SMB_DAT: SM Bus control data line for System Management, bidirectional signal
I2C_CK: General purpose I2C port clock output
I2C_DAT: General purpose I2C port data I/O line
USB3+/USB3-: USB 2.0 Port #3 differential pair
NCSI_CLK_IN: NC-SI 50MHz reference Clock input for Rx, Tx and control interfaces
NCSI_RXD0: NC-SI Receive Data #0 Output, from Network Controller placed on Type 7 modules to
external BMC
NCSI_RXD1: NC-SI Receive Data #1 Output, from Network Controller placed on Type 7 modules to
®
p/n QTS-025-01-L-D-A with the pinout on left table.
™
module is carried directly to Feature
JP6 position BMC/PCI-e slot selector
1-2 BMC
2-3 PCI-e Slot (CN12)
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