Intel C2550 FH8065401488912 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

September 2014

Datasheet, Vol. 2 of 3

Order Number: 330061-002US

361

There are a number of multi-function signal pins that provide the Network Controller 

Sideband Interface (NC-SI) signal to the SoC for the integrated Ethernet controller. 

Nine of these signals are shared with other signal-pin functions that can be used if the 

NC-SI is not used. See 

.

The NC-SI interface signals are applied to the balls/pins when the NCSI_ARB_OUT pin 

(Y59) is sampled high by the SoC when the hard pin-straps are sampled. See 

. When the hard pin-strap NCSI_ARB_OUT 

pin is sampled low, other signals are assigned to these pins. Unlike the three multi-

functional pins mentioned in the previous subsection, no software configuration of 

registers is needed to select the NC-SI interface.

Refer to section 2 of Intel

Controller Programmer's Reference Manual (PRM) for a complete pin list and 

descriptions.

T59

3.3V SUS

GBE_SMBD

I/O OD

NCSI_TX_EX

I

No

P50

3.3V SUS

GBE_SMBCLK

I/O OD

NCSI_CLK_IN

I/O OD

No

T55

3.3V SUS

GBE_SMBALRT_N

I/O OD

NCSI_CRS_DV

O

No

T48

3.3V SUS

GBE_SDP0_1

1

1. When the BIOS starts, GBE_SDP0_1 is an input. It can be re-configured to be an output.

I

NCSI_ARB_IN

I

GPIO_SUS18

Y53

3.3V SUS

GBE_MDIO1_I2C_DATA

I/O OD

NCSI_TXD0

I

GPIO_SUS27

Y54

3.3V SUS

GBE_MDIO1_I2C_CLK

I/O OD

NCSI_TXD1

I

GPIO_SUS26

W54

3.3V SUS

GPIO_SUS1

2

2. When the BIOS starts, GPIO_SUS1 is an input. It can be re-configured to be an output.

I

NCSI_RXD0

O

GPIO_SUS1

V63

3.3V SUS

Reserved for Intel Use

N/A

NCSI_RXD1

O

GPIO_SUS23

Y59

3.3V SUS

Y59_RSVD

O

NCSI_ARB_OUT

O

No