Nc-Si; Nc-Si Signal Definitions; Table 11: Nc-Si Signal Description - Advantech SOM-5992 Design Manual

2.4 NC-SI

2.4.1 NC-SI Signal Definitions

The NC-SI ('Network Controller Sideband Interface') is an electrical interface and protocol defined by the
Distributed Management Task Force (DMTF), which enables the connection of a BMC (Baseboard
Management Controller) to enable out-of-band remote manageability.
If implemented, the NC-SI shall be assigned to the GBE0 interface. NC-SI architecture also enables
multiple endpoints to be connected to the same management controller.
In this configuration, the bus arbitration can also be implemented by hardware using a token ring
configuration. The NCSI_ARB_IN pin of one controller must be connected to the NCSI_ARB_OUT of
another controller to form a ring configuration. A maximum of four network controllers can be connected
in this manner and all controllers sharing the same NC-SI interface pins must support this feature in
order to use hardware-based arbitration. NCSI_ARB_IN and NCSI_ARB_OUT are to be left
unconnected on the Carrier if there is no Carrier network controller.
Table 11 : NC-SI Signal Description
Signal Pin#
NCSI_CLK_IN B91
NCSI_RXD0 B93
NCSI_RXD1 B92
NCSI_TXD0 B96
NCSI_TXD1 B95
NCSI_CRS_DV B94
NCSI_TX_EN A84
NCSI_RX_ER B89
NCSI_ARB_IN B98
NCSI_ARB_OUT B99
Notes:
Description
NC-SI Clock reference for receive, transmit, and
control interface.
NC-SI Receive Data (from NC to BMC).
NC-SI Receive Data (from NC to BMC).
NC-SI Transmit Data (from BMC to NC).
NC-SI Transmit Data (from BMC to NC).
NC-SI Carrier Sense/Receive Data Valid to MC,
indicating that the transmitted data from NC to
BMC is valid.
NC-SI Transmit enable.
NC-SI Receive error.
NC-SI hardware arbitration input.
N/C if not used.
NC-SI hardware arbitration output.
N/C if not used.
４２
I/O Notes
I COM
3.3V Suspend /
3.3V
O COM
3.3V Suspend /
3.3V
O COM
3.3V Suspend /
3.3V
I COM
3.3V Suspend /
3.3V
I COM
3.3V Suspend /
3.3V
O COM
3.3V Suspend /
3.3V
I COM
3.3V Suspend /
3.3V
O COM
3.3V Suspend /
3.3V
I COM
3.3V Suspend /
3.3V
O COM
3.3V Suspend /
3.3V