ASRock 4X4-8840U Motherboard User Guide

: May 15, 2024
: ASRock

Table of Contents

Revision History
Instruction For Use
Installation of ROM Socket
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Download This Manual (PDF format)

ASRock 4X4-8840U Motherboard

ASRock 4X4-8840U Motherboard

Revision History

Date	Description
November 29, 2023	First Release
January 18, 2024	Second Release

Instruction For Use

M.2 Key-M Sockets

M2_M1
M2_M2
Pin| Signal Name| Signal Name| Pin
---|---|---|---
1| GND| +3.3V| 2
3| GND| +3.3V| 4
5| PERn3| NA| 6
7| PERp3| NA| 8
9| GND| LED_1#| 10
11| PETn3| +3.3V| 12
13| PETp3| +3.3V| 14
15| GND| +3.3V| 16
17| PERn2| +3.3V| 18
19| PERp2| NA| 20
21| GND| NA| 22
23| PETn2| NA| 24
25| PETp2| NA| 26
27| GND| NA| 28
29| PERn1| NA| 30
31| PERp1| GND| 32
33| GND| USB_D+| 34
35| PETn1| USB_D-| 36
37| PETp1| GND| 38
39| GND| NA| 40
41| PERn0| NA| 42
43| PERp0| NA| 44
45| GND| NA| 46
47| PETn0| NA| 48
49| PETP0| PERST#| 50
51| GND| CLKREQ#| 52
53| PEFCLKn| NA| 54
55| PEFCLKp| NA| 56
57| GND| NA| 58
| | |
67| NA| NA| 68
69| PEDET| +3.3V| 70
71| GND| +3.3V| 72
73| GND| +3.3V| 74
75| GND| |

Pin34 and Pin36 are defined as USB 2.0 signal to support Key-M to Key-B extension card.
1. M.2 Key-E Socket (M2_E1)
  Pin| Signal Name| Signal Name| Pin
  ---|---|---|---
  1| GND| +3.3V| 2
  3| USB_D+| +3.3V| 4
  5| USB_D-| NA| 6
  7| GND| NA| 8
  9| NA| NA| 10
  11| NA| NA| 12
  13| NA| NA| 14
  15| NA| NA| 16
  17| NA| GND| 18
  19| NA| NA| 20
  21| NA| NA| 22
  23| NA| |
  | | |
  | | NA| 32
  33| GND| NA| 34
  35| PETp| NA| 36
  37| PETn| NA| 38
  39| GND| NA| 40
  41| PERp| NA| 42
  43| PERn| NA| 44
  45| GND| NA| 46
  47| PEFC LKp| NA| 48
  49| PEFCLKn| SUSCLK| 50
  51| GND| PERST0#| 52
  53| CLKREQ#| NA| 54
  55| NA| NA| 56
  57| GND| NA| 58
  59| NA| NA| 60
  61| NA| NA| 62
  63| GND| NA| 64
  65| NA| NA| 66
  67| NA| NA| 68
  69| GND| NA| 70
  71| NA| +3.3V| 72
  73| NA| +3.3V| 74
  75| GND| |
2. COM Port Header (COM1)
  Pin| Signal Name| Signal Name| Pin
  ---|---|---|---
  1| N/A| RRXD1| 2
  3| TTXD1| N/A| 4
  5| GND| N/A| 6
  7| N/A| N/A| 8
  9| PWR| | 10

Top:
Instruction For Use

JP1
JP1_12 : SIO AT Mode
JP1_34 : CMOS Normal (Default)
JP1_46 : Clear CMOS
JP1_57 : Reserved for AT mode
Audio Jack (AUDIO1)
USB 3.2 Gen2 Port (USB3_4)
USB 4 Type-C Port (TC_U4_1)
USB 4 Type-C Port (TC_U4_2)
System Panel Header (PANEL1)

Pin	Signal Name	Signal Name	Pin
1	HDLED+	PLED+	2
3	HDLED-	PLED-	4
5	GND	PWRBTN#	6
7	RESET#	GND	8
9	DUMMY		10

Power Button (PWRBTN2)
Pin| Signal Name
---|---
1| Power on Switch+
2| Power on_ Switch-
3| PLED+
4| PLED-
DC-In Jack (DC_IN1)
USB 2.0 Ports (USB2H_4_7)
Top : USB2H_7
Bottom : USB2H_4
HDMI Ports (HDMI1_2)
Top : HDMI1
Bottom : HDMI2
RJ-45 1G LAN Port (LAN2)
RJ-45 2.5G LAN Port (LAN1)
Back Side :
Power Button (PWR_BTN1)
Fan Connector (FAN1)
Pin| Signal Name
---|---
1| GND
2| +5V
3| FAN_SPEED
4| FAN_SPEED_CONTROL

Back:
Instruction For Use

Battery Connector (BAT1)
Pin| Signal Name
---|---
1| +BAT
2| GND
ESPI Connector (ESPI1)
Pin| Signal Name
---|---
1| GND
2| ESPI_CLK
3| GND
4| ESPI_CS1#
5| ESPI_RESET#
6| GND
7| +3V
8| GND
9| SMB_CLK_MAIN_3V
10| SMB_DATA_MAIN_3V
11| ESPI_DAT0
12| ESPI_DAT1
13| ESPI_DAT2
14| ESPI_DAT3
15| GND
16| +3VSB
17| GPIO_TEST#
18| GND
19| ESPI_ALERT#
20| GND

Installation of ROM Socket

Do not apply force to the actuator cover after ic inserted.
Do not apply force to actuator cover when it is opening over 120 degrees. Otherwise, the actuator cover may be broken.
The yellow dot (Pin1) on the ROM must be installed at Pin1 position of the socket (white arrow area).
Make sure the white dot on the ROM is installed outwards of the socket.
For further details of how to install ROM, please refer to ASRI website.
Warning: If the installation does not follow as the picture, then it may cause severe damage to chipset & MB.

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