AXIOMTEK IMB520, IMB521 User Manual
IMB520 / 521
Intel® Socket 1151 Core
TM
i7/ i5/ i3 /
Pentium®/ Celeron®
Processors ATX Industrial
Motherboard
User’s Manual
ii
Disclaimers
This manual has been carefully checked and believed to contain accurate information.
Axiomtek Co., Ltd. assumes no responsibility for any infringements of patents or any third
party’s rights, and any liability arising from such use.
Axiomtek does not warrant or assume any legal liability or responsibility for the accuracy,
completeness or usefulness of any information in this document. Axiomtek does not make any
commitment to update the information in this manual.
Axiomtek reserves the right to change or revise this document and/or product at any time
without notice.
No part of this document may be reproduced, stored in a retrieval system, or transmitted, in
any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,
without the prior written permission of Axiomtek Co., Ltd.
CAUTION
Wrong type of batteries may cause explosion. It is recommended that users only replace with
the same or equivalent type of batteries as suggested by the manufacturer once properly
disposing of any used ones.
Copyright 2019 Axiomtek Co., Ltd.
All Rights Reserved
January 2019, Version A1
Printed in Taiwan
iii
ESD Precautions
Computer boards have integrated circuits sensitive to static electricity. To prevent chipsets
from electrostatic discharge damage, please take care of the following jobs with precautions:
Do not remove boards or integrated circuits from their anti-static packaging until you are
ready to install them.
Before holding the board or integrated circuit, touch an unpainted portion of the system
unit chassis for a few seconds. To discharge static electricity from your body.
Wear a grounding wrist strap, available from most electronic component stores, when
handling boards and components.
Trademarks Acknowledgments
Axiomtek is a trademark of Axiomtek Co., Ltd.
Intel® and Celeron® are trademarks of Intel Corporation.
Windows® is a trademark of Microsoft Corporation.
AMI is a trademark of American Megatrend Inc.
IBM, PC/AT, PS/2, and VGA are trademarks of International Business Machines Corporation.
Other brand names and trademarks are the properties and registered brands of their
respective owners.
iv
Table of Contents
Disclaimers ...................................................................................................... ii
ESD Precautions ............................................................................................. iii
Chapter 1 Introduction ............................................. 1
1.1 Features ................................................................................................ 2
1.2 Specifications ........................................................................................ 2
1.3 Packing list ............................................................................................ 4
Chapter 2 Board and Pin Assignments .................... 5
2.1 Board Layout ......................................................................................... 5
2.2 Rear I/O ................................................................................................. 6
2.3 Block Diagram ..................................................................................... 7
2.4 Jumper Settings .................................................................................... 8
2.4.1 Clear CMOS (JP8) ...................................................................................... 9
2.4.2 AT/ATX Mode Select (JP9) .......................................................................... 9
2.4.3 COM1 Mode Select (JP4, JP5, JP6) ......................................................... 10
2.4.4 COM2 Mode Select (JP1, JP2, JP3) ......................................................... 10
2.4.5 Temperature Sensor Source Select (JP7) ................................................. 10
2.5 Connectors .......................................................................................... 11
2.5.1 Keyboard and PS/2 Mouse Connector (CN1) ........................................... 12
2.5.2 Front Panel Header (CN24) ...................................................................... 12
2.5.3 GPIO Header (CN25) ................................................................................ 13
2.5.4 COM1 Connector (COM1) ........................................................................ 13
2.5.5 LAN and USB 3.1 Connectors (CN5 and CN6) ........................................ 14
2.5.6 Audio Jack (CN4) ...................................................................................... 14
2.5.7 Front Audio Header (CN11) ....................................................................... 15
2.5.8 COM Headers (COM2 ~ COM6) ............................................................... 15
2.5.9 External Sensor Header (JP7) .................................................................. 15
2.5.10 DisplayPort and HDMI Connector (CN2) .................................................. 16
2.5.11 Internal USB Headers (CN16~CN17, CN20, USB1) ................................ 16
2.5.12 SATA 3.0 Connectors (SATA1 ~ SATA4) ................................................... 17
2.5.13 SMBus Header (CN28) ............................................................................. 17
2.5.14 Voltage Monitor Header (CN27) ................................................................ 17
2.5.15 Power Input Connectors (ATX1 and CN26) .............................................. 18
2.5.16 PCI-Express x4 Slots (PCIe1~PCIe4) ....................................................... 19
2.5.17 PCI-Express x1 Slots (PCIe5) ................................................................... 20
2.5.18 Fan Connectors (FAN1~FAN3) ................................................................. 20
2.5.19 Internal USB 3.1 Gen1 Connector (CN21) ................................................ 21
2.5.20 VGA and DVI-D Connector (CN3) ............................................................. 21
v
2.5.21 TPM Pin Header (CN23) ......................................................................... 22
2.5.22 Internal Mouse Connector (CN9) ............................................................ 22
2.5.23 Internal Keyboard Connector (CN8) ........................................................ 22
Chapter 3 Hardware Description ........................... 23
3.1 Microprocessors .................................................................................. 23
3.2 BIOS.................................................................................................... 23
3.3 System Memory .................................................................................. 23
Chapter 4 AMI BIOS Setup Utility .......................... 25
4.1 Starting ................................................................................................ 25
4.2 Navigation Keys .................................................................................. 25
4.3 Main Menu .......................................................................................... 27
4.4 Advanced Menu .................................................................................. 28
4.5 Chipset Menu ...................................................................................... 41
4.6 Security Menu ..................................................................................... 50
4.7 Boot Menu ................................ ................................ ........................... 51
4.8 Save & Exit Menu ................................................................................ 52
Appendix A Watchdog Timer ................................... 55
About Watchdog Timer ................................................................................... 55
How to Use Watchdog Timer ......................................................................... 55
Appendix B TPM Module Installation ....................... 57
Appendix C iAMT Settings ...................................... 61
Entering Management Engine BIOS Extension (MEBx) ................................ 61
Set and Change Password ............................................................................ 61
iAMT Settings ................................................................................................. 63
iAMT Web Console ........................................................................................ 66
Appendix D Configuring SATA for RAID .................. 69
Configuring SATA Hard Drive(s) for RAID Function ....................................... 69
Appendix E Digital I/O ............................................. 77
Digital I/O Software Programming .................................................................. 77
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IMB520 / 521 LGA1151 ATX Motherboard
Introduction 1
Chapter 1
Introduction
The IMB520 / 521 is an advanced ATX industrial motherboard based on the 8th Generation
Intel® Core™ i7/ i5/ i3/ Pentium® and Celeron® processors (Coffeelake) in an LGA1151
socket and comes with an Intel® Q370 chipset. Specially designed for optimal computing and
visual performance, the IMB520 / 521 motherboard is an ideal solution for major industry
applications ranging from financial modeling to designing complex buildings and vehicles. With
its built-in Intel® HD Graphics GFX, this industrial grade motherboard delivers superb 3D
visual performance and supports triple display through DVI-D, HDMI and VGA ports to meet
professional-grade CAD and media/entertainment needs.
In addition, the IMB520 / 521 supports Intel® Turbo Boost 2.0 technology, Intel®
Hyper-Threading technology, Intel® HD Graphics with DX11, 64GB DDR4 2400/2666MHz
memory, and a PCI-Express 3.0 x16 slot. It also features Intel® Active Management
Technology 12 (iAMT), SATA RAID, as well as PCI Express expansion interfaces, making it
specifically suited for applications with added security features.
IMB520 / 521 LGA1151 ATX Motherboard
2 Introduction
1.1 Features
LGA1151 socket 8th Generation Intel® Core™ i7/i5/i3, Pentium® and Celeron®
processors (Coffeelake) up to 95W
4 x DDR4 2400/2666MHz DIMM with maximum memory capacity up to 64GB (max. 16GB
per slot)
DVI-D, HDMI, Displayport and VGA with triple view support
4 x SATA-600 RAID 0/1/5/10
2 x USB3.1 (Gen2), 4 x USB 3.1 (Gen1) and 7 x USB 2.0 ports
1.2 Specifications
CPU
LGA1151 Socket 8
th
Generation Intel® Core™ i7/ i5/ i3, Pentium® and Celeron®
processor.
Chipset
Intel
®
Q370. (IMB520)
Intel
®
C246. (IMB521)
BIOS
AMI BIOS.
System Memory
Q370:
4 x 288-pin DIMM sockets.
Maximum 64GB DDR4 memory (max. 16GB per slot).
Supports 2400/2666MHz.
C246:
4 x 288-pin DIMM sockets.
Maximum 64GB DDR4 memory (max. 16GB per slot).
Supports 2400/2666MHz.
Supports the memory with ECC function.
Onboard Multi I/O
1 x PS/2 keyboard and mouse.
Six serial ports:
- 4 x RS-232 (internal box headers).
- 2 x RS-232/422/485 (one in rear I/O, and the other in internal box header).
USB Interface
2 x USB3.1(Gen2) ports.
4 x USB 3.1(Gen1) ports.
7 x USB 2.0 ports.
Ethernet
LAN1: 1000/100/10Mbps Gigabit/Fast Ethernet supports Wake-on-LAN, PXE Boot
ROM, iAMT with Intel® i219LM.
LAN2: 1000/100/10Mbps Gigabit/Fast Ethernet supports Wake-on-LAN, PXE Boot
ROM with Intel® i211AT.
IMB520 / 521 LGA1151 ATX Motherboard
Introduction 3
Serial ATA
4 x SATAIII with RAID 0/1/5/10.
Audio
Realtek ALC662 HDA Codec.
Supports MIC-in/line-in/line-out.
Display
1 x 15-pin D-Sub as VGA connector. Resolution max. up to 1920x1200 @60Hz.
1 x HDMI 1.4b with max. resolution up to 4096x2160 @24Hz.
1 x Displayport with max. resolution up to 4096 x 2304 @60Hz, Do not supports
DP++.
1 x DVI-D with resolution max. up to 1920×1200 @60Hz.
Expansion Interface
1 x PCI-Express x16 slot.
4 x PCI-Express x4 slots.
1 x PCI-Express x1 slots.
1 x PCI slots.
Power Input
1 x ATX power input connector.
1 x 12V ATX power input connector for CPU Power.
Operating Temperature
0°C ~ 60°C.
Storage Temperature
-20°C ~ 75°C.
Form Factor
305 x 244mm.
Note
All specifications and images are subject to change without notice.
IMB520 / 521 LGA1151 ATX Motherboard
4 Board and Pin Assignments
1.3 Packing list
Bulk packing
1 x Motherboard
1 x I/O bracket
Gift box
1 x Motherboard
1 x I/O bracket
1 x Driver DVD
IMB520 / 521 LGA1151 ATX Motherboard
Board and Pin Assignments 5
Chapter 2
Board and Pin Assignments
2.1 Board Layout
Top side
IMB520 / 521 LGA1151 ATX Motherboard
6 Board and Pin Assignments
2.2 Rear I/O
I/O side
I/O bracket
IMB520 / 521 LGA1151 ATX Motherboard
Board and Pin Assignments 7
2.3 Block Diagram
IMB520 / 521 LGA1151 ATX Motherboard
8 Board and Pin Assignments
2.4 Jumper Settings
Pin description
A jumper is a small component consisting of a jumper clip and jumper pins. Install a jumper clip
on two jumper pins to close the jumper pins. Remove the jumper clip from two jumper pins to
open the jumper pins. The following illustration shows how to set up a jumper.
Before applying power to the IMB520 / 521 series, make sure all of the jumpers are in factory
default position. Below you can find a summary table of all jumpers and onboard default
settings.
Note
Turn off power before changing any default jumper settings.
Jumper
Description
Setting
JP8
Clear CMOS
Default: Normal Operation
1-2 Close
JP9
AT/ATX Power Mode Select
Default: ATX Mode
2-3 Close
JP3, JP6
COM1/2 RS-232/422/485 Mode Select
Default: RS-232
1-2 Close
JP1, JP2
3-5, 4-6 Close
JP4, JP5
3-5, 4-6 Close
JP7
System Temperature Sensor Source Select
Default: Internal Sensor
External Sensor can be installed on 2-3
1-2 Close
Note
To identify the first pin of a header or jumper, please refer to the following
information:
Usually, there is a thick line or a triangle near the header or jumper pin 1.
A square pad, which you can find on the back of the motherboard, is usually
used for pin 1.
IMB520 / 521 LGA1151 ATX Motherboard
Board and Pin Assignments 9
2.4.1 Clear CMOS (JP8)
This jumper (3x1-pin p=2.54mm) allows you to clear the Real Time Clock (RTC) RAM in
CMOS. You can clear the CMOS memory of date, time, and system setup parameters by
erasing the CMOS RTC RAM data. The onboard button cell battery powers the RAM
data in CMOS, which includes system setup information such as system passwords.
To erase the RTC RAM:
1. Turn OFF the computer and unplug the power cord.
2. Remove the onboard battery.
3. Move the jumper clip from pins 1-2 (default) to pins 2-3. Keep the clip on pins 2-3
for about 5~10 seconds, then move the clip back to pins 1-2.
4. Re-install the battery.
5. Plug the power cord and turn ON the computer.
6. Hold down the <Del> key during the boot process and enter BIOS setup to re-enter
data.
2.4.2 AT/ATX Mode Select (JP9)
This 3x1-pin p=2.54mm jumper allows you to select AT or ATX power mode.
Function
Setting
Normal operation (Default)
1-2 close
Clear CMOS
2-3 close
Function
Setting
AT mode
1-2 close
ATX mode (Default)
2-3 close
IMB520 / 521 LGA1151 ATX Motherboard
10 Board and Pin Assignments
2.4.3 COM1 Mode Select (JP4, JP5, JP6)
Use these jumpers (3x2-pin p=2.54mm) to set COM1 port to operate in RS-232, RS-422
or RS-485 communication mode.
JP6 JP4 JP5
2.4.4 COM2 Mode Select (JP1, JP2, JP3)
Use these jumpers (3x2-pin p=2.54mm) to set COM1 port to operate in RS-232, RS-422
or RS-485 communication mode.
JP3 JP1 JP2
2.4.5 Temperature Sensor Source Select (JP7)
Use these jumpers (3x1-pin p=2.54mm) to set temperature sensor source to operate
form external or onboard mode.
Note
An external sensor can be installed at 2-3.
Function
Setting
RS-232 mode
(Default)
JP6 1-2 close
JP4 3-5, 4-6 close
JP5 3-5, 4-6 close
RS-422 mode
JP6 3-4, 7-8 close
JP4 1-3, 2-4 close
JP5 1-3, 2-4 close
RS-485 mode
JP6 5-6, 7-8 close
JP4 1-3, 2-4 close
JP5 1-3, 2-4 close
Function
Setting
RS-232 mode
(Default)
JP3 1-2 close
JP1 3-5, 4-6 close
JP2 3-5, 4-6 close
RS-422 mode
JP3 3-4, 7-8 close
JP1 1-3, 2-4 close
JP2 1-3, 2-4 close
RS-485 mode
JP3 5-6, 7-8 close
JP1 1-3, 2-4 close
JP2 1-3, 2-4 close
Function
Setting
Onboard Sensor(Default)
1-2 close
External Sensor
2-3 close
IMB520 / 521 LGA1151 ATX Motherboard
Board and Pin Assignments 11
2.5 Connectors
Signals go to other parts of the system through connectors. Loose or improper connection
might cause problems, Make sure all connectors are properly and firmly connected. Here is a
summary table showing the connectors on the hardware.
Connector
Description
CN1
PS/2 KB/MS Connector
CN2
DP/HDMI Connector
CN3
DVI-D/ VGA Connector
CN4
Audio Jack
CN5
RJ45 + USB3.1 GEN1 Connector
CN6
RJ45 (iAMT)+ USB3.1 GEN2 Connector
CN8, CN9
Internal PS/2 KB/MS Connector
CN11
Front Audio Header
CN14
PCI-Express x16 Slots
PCIe1 ~ PCIe4
PCI-Express x4 Slots
PCI1
PCI Slots
PCIe5
PCI-Express x1 Slots
CN15
External Sensor Connector
CN16, CN17, CN20
Internal USB2.0 Headers
CN21
Internal USB3.1 GEN1 Connector
CN23
TPM 2.0 Connector (Optional)
CN24
Front Panel Header
CN25
DIO Connector
CN26
24-pin Power Input Connector
CN27
Voltage Monitor Header
CN28
SMBus Header
ATX1
CPU Power Input Connector
COM1
Comport Connector
COM2 ~ COM6
Comport Box Header
FAN1
CPU Fan Connector
FAN2, FAN3
System Fan Connectors
PCI1 ~ PCI4
PCI Slots
SATA1 ~ SATA4
SATA III Connector
IMB520 / 521 LGA1151 ATX Motherboard
12 Board and Pin Assignments
2.5.1 Keyboard and PS/2 Mouse Connector (CN1)
The board supports a keyboard and mouse interface. Connector CN1 is a DIN connector
for PS/2 keyboard connection via a Y-Cable.
Pin
Signal
CN1
1
Keyboard Data
2
Mouse Data
3
GND
4
VCC
5
Keyboard Clock
6
Mouse Clock
2.5.2 Front Panel Header (CN24)
This is a front panel header (7x2-pin p=2.54mm).
Note
[*]
: The buzzer on the motherboard will be active when pin 2 and pin 4 are
connected; the external speaker on the chassis will be active when pin 2
and pin 4 are open.
Pin
Signal
1
Power LED+
2
SPK-
[*]
3
GND
4
BUZZER
5
Power LED-
6
N/C 7 N/C
8
SPK+
[*]
9
PWR-
10
PWR+
11
RESET-
12
RESET+
13
HD LED-
14
HD LED+
IMB520 / 521 LGA1151 ATX Motherboard
Board and Pin Assignments 13
2.5.3 GPIO Header (CN25)
This header (5x2-pin p=2.00mm) is for digital I/O interface.
Note
The default value of DIO1 to DIO8 is set as GPI with high level.
2.5.4 COM1 Connector (COM1)
This is a high rise 9-pin D-Sub connector for COM1 serial port interface. The pin
assignments of RS-232/422/485 are listed in the table below.
Note
[*]
: Signals of COM1 can be RS-232/422/485 by selecting JP4, JP5 and JP6
(see section 2.4.3).
Pin
Signal
Pin
Signal
1
DIO1
2
DIO8
3
DIO2
4
DIO7
5
DIO3
6
DIO6
7
DIO4
8
DIO5
9
NC
10
GND
Pin
RS-232
[*]
RS-422
[*]
RS-485
[*]
1
DCD#
TX-
485- 2 RXD
TX+
485+
3
TXD
RX+
N/C
4
DTR#
RX-
N/C 5 GND
GND
GND
6
DSR#
N/C
N/C 7 RTS#
N/C
N/C 8 CTS#
N/C
N/C
9
RI#
N/C
N/C
2 4 6 8 10
1 3 5 7 9
IMB520 / 521 LGA1151 ATX Motherboard
14 Board and Pin Assignments
LAN
USB
2.5.5 LAN and USB 3.1 Connectors (CN5 and CN6)
The motherboard comes with two high performance plug and play Ethernet interfaces
(RJ-45) which are fully compliant with the IEEE 802.3 standard. Connection can be
established by plugging one end of the Ethernet cable into this RJ-45 connector and the
other end to a 1000/100/10 Base-T hub.
The Universal Serial Bus (compliant with USB 3.1 Gen2 (CN6) or USB3.1 Gen1 (CN5)
connectors on the rear I/O are for installing USB peripherals such as a keyboard, mouse,
scanner, etc.
Note
Speed LED turns orange for 1000Mbps or green for 100Mbps. The light
is off for 10Mbps.
CN6 supports AMT and USB3.1 GEN 2 when the chipset is customized
into Intel® Q370 & C246. Both CN5 and CN6 support Wake-on-LAN.
2.5.6 Audio Jack (CN4)
Install an audio driver, and then attach audio devices to CN4.
Pin
LAN Signal
Pin
LAN Signal
L1
Tx+ (Data
transmission positive)
L2
Tx- (Data transmission
negative)
L3
Rx+ (Data reception
positive)
L4
RJ-1 (For 1000 Base-T
only)
L5
RJ-1 (For 1000
Base-T only)
L6
Rx- (Data reception
negative)
L7
RJ-1 (For 1000
Base-T only)
L8
RJ-1 (For 1000 Base-T
only)
A
100 LAN LED (Green)
/ 1000 LAN LED
(Orange)
B
Active LED
Pin
USB Signal
Pin
USB Signal
1
USB3_POWER
2
USB1 -
3
USB1 +
4
GND
5
USB3_SSRX1-
6
USB3_SSRX1+
7
GND
8
USB3_SSTX1-
9
USB3_SSTX1+
10
USB3_POWER
11
USB2 -
12
USB2 +
13
GND
14
USB3_SSRX2-
15
USB3_SSRX2+
16
GND
17
USB3_SSTX2-
18
USB3_SSTX2+
Pin Color
Signal
Blue
Line-in
Green
Line-out
Pink
MIC-in
IMB520 / 521 LGA1151 ATX Motherboard
Board and Pin Assignments 15
2.5.7 Front Audio Header (CN11)
This is a front audio header (5x2-pin p=2.00mm) for convenient connection and control
of audio devices.
2.5.8 COM Headers (COM2 ~ COM6)
The motherboard comes with 5x2-pin p=2.54mm headers for COM2~COM6 serial port
interfaces.
COM2~COM6:
COM2 ~ COM6
2.5.9 External Sensor Header (JP7)
The external sensor header is an 1x3-pin p=2.54mm header. The function of JP7 is to
connect an external sensor.
Pin
Signal
Pin
Signal
1
MIC_IN
2
GND
3
LINE_IN_L
4
GND
5
LINE_IN_R
6
GND
7
AUD_OUT_L
8
GND
9
AUD_OUT_R
10
GND
Pin
Signal
Pin
Signal
1
DCD#
2
DSR#
3
RXD#
4
RTS#
5
TXD#
6
CTS#
7
DTR#
8
RI# 9 GND
10
N/C
Pin
Signal
1
Sys_Temp
2
GND
9
1
10
2
IMB520 / 521 LGA1151 ATX Motherboard
16 Board and Pin Assignments
CN2A
CN2B
2.5.10 DisplayPort and HDMI Connector (CN2)
CN2 is a double-deck connector comprising an upper connector for DisplayPort (CN2A)
and a lower connector for HDMI (CN2B).
2.5.11 Internal USB Headers (CN16~CN17, CN20, USB1)
These are 5x2-pin p=2.54mm headers for USB 2.0 interface.
The USB1 is a Type-A 180D connector for USB2.0 signal.
Pin
Signal
Pin
Signal
1
LANE 0
21
DATA2
2
GND
22
GND
3
LANE 0#
23
DATA2#
4
LANE 1
24
DATA1
5
GND
25
GND
6
LANE 1#
26
DATA1#
7
LANE 2
27
DATA0
8
GND
28
GND
9
LANE 2#
29
DATA1#
10
LANE 3
30
Clock
11
GND
31
GND
12
LANE 3#
32
Clock#
13
Detect Pin
33
NC
14
GND
34
NC
15
AUX CH
35
SCL
16
GND
36
SDA
17
AUX CH#
37
GND
18
Hot Plug Detect
38
+5V POWER
19
GND
39
Hot Plug Detect
20
DP_PWR(3.3V)
Pin
Signal
Pin
Signal
1
+5 V_DUAL
2
+5 V_DUAL
3
USB 5, 7, 12-
4
USB 6, 8, 13-
5
USB 5, 7, 12+
6
USB 6, 8, 13+
7
GND
8
GND
10
GND
Pin
Signal
1
+5V_DUAL
2
USB-
3
USB+
4
GND
IMB520 / 521 LGA1151 ATX Motherboard
Board and Pin Assignments 17
2.5.12 SATA 3.0 Connectors (SATA1 ~ SATA4)
These Serial Advanced Technology Attachment (Serial ATA or SATA) connectors are for
SATA 3.0 interface allowing up to 6.0Gb/s data transfer rate. It is a computer bus
interface for connecting to devices such as hard disk drive.
2.5.13 SMBus Header (CN28)
The CN28 (5x1-pin p=2.00mm) is for SMBus (System Management Bus) interface.
2.5.14 Voltage Monitor Header (CN27)
The function of CN27 (8x1-pin p=2.54mm) is for voltage monitoring. It doesn’t supply
power.
Pin
Signal
1
GND
2
SATA_TX+
3
SATA_TX-
4
GND
5
SATA_RX-
6
SATA_RX+
7
GND
Pin
Signal
Pin
Signal
1
SMB_SCL
2
N/C 3 GND
4
SMB_SDA
5
+5V
Pin
Signal
Pin
Signal
1
GND
2
GND
3
VCC5_SB
4
+3.3V
5
-5V 6 +5V 7 -12V
8
+12V
1 2 3
4
IMB520 / 521 LGA1151 ATX Motherboard
18 Board and Pin Assignments
2.5.15 Power Input Connectors (ATX1 and CN26)
Steady and sufficient power can be supplied to all components on the motherboard by
connecting the power connector. Please make sure all components and devices are
properly installed before connecting the power connector.
An external power supply plug fits into ATX1 and CN26 in only one orientation. Properly
press down power supply plug until it completely and firmly fits into the connector. Loose
connection may cause system instability.
ATX1 CPU power input connector:
CN26 24-pin power input connector:
Pin
ATX1 Signal
Pin
ATX1 Signal
1
GND
5
+12V
2
GND
6
+12V
3
GND
7
+12V
4
GND
8
+12V
Pin
CN26 Signal
Pin
CN26 Signal
1
3.3V
13
3.3V 2 3.3V
14
-12V
3
GND
15
GND
4
+5V
16
PS_ON
5
GND
17
GND
6
+5V
18
GND
7
GND
19
GND
8
PWR OK
20
-5V 9 5VSB
21
+5V
10
+12V
22
+5V
11
+12V
23
+5V
12
3.3V
24
GND
1 4 5 8 1
12
13
24
IMB520 / 521 LGA1151 ATX Motherboard
Board and Pin Assignments 19
2.5.16 PCI-Express x4 Slots (PCIe1~PCIe4)
This motherboard has two PCI-Express x4 slots.
Pin
Signal
Pin
Signal
B1
+12V_PS
A1
GND
B2
+12V_PS
A2
+12V_PS
B3
+12V_PS
A3
+12V_PS
B4
GND
A4
GND
B5
SMB_CLK_RESUME
A5
N/C
B6
SMB_DATA_RESUME
A6
N/C
B7
GND
A7
N/C
B8
+3.3V_PS
A8
N/C
B9
N/C
A9
+3.3V_PS
B10
+3.3V_SB
A10
+3.3V_PS
B11
PCH_WAKE_N
A11
PWRGD
B12
N/C
A12
GND
B13
GND
A13
CLKOUT_PCIE_P5
B14
PCIE1_SLOT1_TX_DP_C
A14
CLKOUT_PCIE_N5
B15
PCIE1_SLOT1_TX_DN_C
A15
GND
B16
GND
A16
PCIE1_SLOT1_RX_DP_C
B17
PCIEX4_SLOT1_PRSNT2_N
A17
PCIE1_SLOT1_RX_DN_C
B18
GND
A18
GND
B19
PCIE2_TX_DP
A19
N/C
B20
PCIE2_TX_DN
A20
GND
B21
GND
A21
PCIE2_RX_DP
B22
GND
A22
PCIE2_RX_DN
B23
PCIE3_TX_DP
A23
GND
B24
PCIE3_TX_DN
A24
GND
B25
GND
A25
PCIE3_RX_DP
B26
GND
A26
PCIE3_RX_DN
B27
PCIE4_TX_DP
A27
GND
B28
PCIE4_TX_DN
A28
GND
B29
GND
A29
PCIE4_RX_DP
B30
N/C
A30
PCIE4_RX_DN
B31
N/C
A31
GND
B32
GND
A32
N/C
IMB520 / 521 LGA1151 ATX Motherboard
20 Board and Pin Assignments
2.5.17 PCI-Express x1 Slots (PCIe5)
This motherboard has two PCI-Express x1 slots.
Pin
Signal
Pin
Signal
B1
+12V_PS
A1
GND
B2
+12V_PS
A2
+12V_PS
B3
+12V_PS
A3
+12V_PS
B4
GND
A4
GND
B5
SMB_CLK_RESUME
A5
N/C
B6
SMB_DATA_RESUME
A6
N/C
B7
GND
A7
N/C
B8
+3.3V_PS
A8
N/C
B9
N/C
A9
+3.3V_PS
B10
+3.3V_SB
A10
+3.3V_PS
B11
PCH_WAKE_N
A11
PWRGD
B12
N/C
A12
GND
B13
GND
A13
CLKOUT_PCIE_P8
B14
PCIE5_SLOT_TX_DP_C
A14
CLKOUT_PCIE_N8
B15
PCIE5_SLOT_TX_DN_C
A15
GND
B16
GND
A16
PCIE5_SLOT_RX_DP_C
B17
N/C
A17
PCIE5_SLOT_RX_DN_C
B18
GND
A18
GND
2.5.18 Fan Connectors (FAN1~FAN3)
This motherboard has three fan connectors. Find fan speed option(s) at BIOS Setup
Utility: Advanced\HW Monitor\PC Health Status.
The FAN1 (4x1-pin p=2.54mm) is for the the CPU fan connector.
The FAN2 and FAN3 (4x1-pin p=2.54mm) are for system fan connectors.
Pin
Signal
1
GND
2
+12V
3
FAN Speed Detection
4
FAN Speed Control
Pin
Signal
1
GND
2
+12V
3
FAN Speed Detection
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