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Chapter 4: Motherboard Connections
Host Fabric Interface (HFI) Carrier Card Sideband Headers (for the F Model CPU
Only)
Two Host Fabric Interface (HFI) carrier card headers are located at JHFI1/JHFI2 on the
motherboard. The JHFI headers are used when the F model processor is installed on the
CPU socket on the motherboard. Use an HFI sideband cable to connect the carrier card to the
JHFI headers, and use an appropriate IFP (Internal-Faceplate-to-Processor) cable (optional)
to connect the carrier card to the F model processor to enhance system performance (See
Note below). See page 34 for the installation instructions. Please note that in a dual-processor
system, JHFI1 is used for CPU1, and JHFI2 is for CPU2. Refer to the table below for the
pin-out descriptions.
Note:
For the HFI carrier card to function properly, please purchase the appropriate
IFP cable from Supermicro. Please refer to Supermicro's website at www.supermicro.
com for the part number of the IFP cable specified for your system.
HFI Carrier Card Sideband Header
Pin Definitions
Pin#
Definition
Pin#
Definition
1
Ground
2
SMB_HFI_0_SCL
3
HFI0_MODPRST_N
4
SMB_HFI_0_SDA
5
LED_HFI0_N
6
HFI0_RESET_N
7
Ground
8
HFI0_INT_N
9
Ground
10
SMB_HFI_1_SCL
11
HFI1_MODPRST_N
12
SMB_HFI_1_SDA
13
LED_HFI1_N
14
HFI1_RESET_N
15
Ground
16
HFI1_INT_N
17
Reserved
18
P3V3
19
P2V5_PWRGD
20
P3V3
21
P2V5
22
PCIe_SMBCLK
23
Ground
24
PCIe_SMBDAT
S-SGPIO Header
A Serial General Purpose Input/Output header (S-SGPIO) is located on the motherboard.
This header is used to communicate with the enclosure management chip on the backplane.
See the table below for pin definitions.
SGPIO Header
Pin Definitions
Pin#
Definition
Pin#
Definition
1
NC
2
NC
3
Ground
4
DATA Out
5
Load
6
Ground
7
Clock
8
NC
NC = No Connection
