４２
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#
Description
I/O
Notes
NCSI_CLK_IN
B91
NC-SI Clock reference for receive, transmit, and
control interface.
I COM
3.3V Suspend /
3.3V
NCSI_RXD0
B93
NC-SI Receive Data (from NC to BMC).
O COM
3.3V Suspend /
3.3V
NCSI_RXD1
B92
NC-SI Receive Data (from NC to BMC).
O COM
3.3V Suspend /
3.3V
NCSI_TXD0
B96
NC-SI Transmit Data (from BMC to NC).
I COM
3.3V Suspend /
3.3V
NCSI_TXD1
B95
NC-SI Transmit Data (from BMC to NC).
I COM
3.3V Suspend /
3.3V
NCSI_CRS_DV
B94
NC-SI Carrier Sense/Receive Data Valid to MC,
indicating that the transmitted data from NC to
BMC is valid.
O COM
3.3V Suspend /
3.3V
NCSI_TX_EN
A84
NC-SI Transmit enable.
I COM
3.3V Suspend /
3.3V
NCSI_RX_ER
B89
NC-SI Receive error.
O COM
3.3V Suspend /
3.3V
NCSI_ARB_IN
B98
NC-SI hardware arbitration input.
N/C if not used.
I COM
3.3V Suspend /
3.3V
NCSI_ARB_OUT
B99
NC-SI hardware arbitration output.
N/C if not used.
O COM
3.3V Suspend /
3.3V
Notes:
