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75 pin M.2 Edge (B and M notched) connector layout
Разъем 75 pin M.2 Edge (B and M notched)
M.2 (Next Generation Form Factor, NGFF), is a specification for computer expansion cards. Having a small and flexible physical specification, the M.2 is suitable for solid-state storage applications, especially when used in small devices such as ultrabooks or tablets.

The M.2 standard is designed as a revision and improvement to the mSATA standard, which uses the PCI Express Mini Card physical layout. While mSATA took advantage of the existing PCI Express Mini Card form factor and connector, M.2 has been designed to maximize usage of the card space.  Supported host controller interfaces and internally provided ports are a superset to those defined by the SATA Express interface. 

The M.2 specification covers multiple Host Interface solutions including:

  • PCI Express (PCIe)
  • Serial Peripheral Interface (SPI)
  • High-Speed Inter-Chip (HSIC)
  • SuperSpeed Inter-Chip (SSIC)
  • Mobile PCIe (M-PCIe)
  • Universal Serial Bus (USB)
  • Secure Digital Input Output (SDIO)
  • Universal Asynchronous Receiver/Transmitter (UART)
  • Pulse Code Modulation / Inter-IC Sound (PCM/I2S)
  • Inter-Integrated Circuit (I2C)
  • System Management Bus (SMBus)
  • Serial ATA (SATA)
  • DisplayPort (DP)
  • All future variants of the interfaces in this list

Computer bus interfaces provided through the M.2 connector are PCI Express 3.0 (up to four lanes), Serial ATA 3.0, and USB 3.0 (a single logical port for each of the latter two). It is up to the manufacturer of the M.2 host or device to select which interfaces are to be supported, depending on the desired level of host support and device type. The M.2 connector has different keying notches that denote various purposes and capabilities of M.2 hosts and modules, preventing plugging of M.2 modules into feature-incompatible host connectors

M.2 uses a dual-sided edge card connector with a 0.5 mm contact pitch. There are some mechanical keys defined for SSDs.  For example key B M.2 pinout supports SSD/WWAN: 1x SATA SSD or 1x, 2x PCIe SSD (and WWAN) Host Interfaces. Key M M.2 pinout supports SSDs only: 1x SATA or 1x, 2x, or 4x PCIe Host Interfaces. Sockets are defined as follows:  Socket 1 accepts cards with an “A” key notch present, Socket 2 accepts cards with a “B” key notch present, Socket 3 accepts cards with an “M” key notch present.

M.2 pinout for key B (1x SATA, 2x PCIe)

Pin
Number		 Pin
Name		 Description Voltage
1 CONFIG_3   Defines module type  
2 3.3 V  Supply pin 3.3 V
3 GND   Ground  
4 3.3 V   Supply pin 3.3 V
5 GND     
6

FULL_CARD_POWER_OFF#

  Out 0/1.8V or 3.3V
7 USB_D+    
8 W_DISABLE# Out 0/3.3V
9 USB D-     
10 GPIO_9/DAS/DSS   Device Activity Signal / Disable Staggered Spinup  0/3.3V
11 GND     
12-19 removed  Mechanical notch B  
20 GPIO_5  I/O 0/1.8V
21 CONFIG_0   Defines module type  
22 GPIO_6 I/O 0/1.8V
23 GPIO_11 I/O 0/1.8V
24 GPIO_7 I/O 0/1.8V
25 DPR Out 0/1.8V
26 GPIO_10 I/O 0/1.8V
27 GND Ground  
28 GPIO_8   I/O 0/1.8V
29 PERn1 / USB RX- /SSIC-RxN   PCIe Lane 1 Rx or USB 3.0 RX-    
30 UIM-RESET   In  
31  PERp1 / USB RX+/ SSIC-RxP   PCIe Lane 1 Rx or USB 3.0 RX+    
32 UIM-CLK   In  
33 GND   Ground  
34 UIM-DATA   I/O  
35 PETn1 / USB TX- /SSIC-TxN   PCIe Lane 1 Tx or USB 3.0 TX-  
36 UIM-PWR   In  
37 PETp1 / USB TX+/SSIC-TxP   PCIe Lane 1 Tx or USB 3.0 TX+  
38 DEVSLP  Device Sleep, input. If driven high the host is informing the
SSD to enter a low power state.		  
39 GND   Ground  
40 GPIO_0/SMB_CLK   I/O 0/1.8V
41 SATA-B+/PERn0  Host receiver differential signal pair. If in PCIe mode PCIe Lane 0 Rx  
42 GPIO_1/SMB_DATA   I/O 0/1.8V
43 SATA-B-/PERp0  Host receiver differential signal pair. If in PCIe mode PCIe Lane 0 Rx  
44 GPIO_2/ALERT#    0/1.8V
45 GND   Ground  
46 GPIO_3   I/O 0/1.8V
47 SATA-A-/PETn0  Host transmitter differential signal pair. If in PCIe mode PCIe Lane 0 Tx  
48 GPIO_4   I/O 0/1.8V
49 SATA-A+/PETp0   Host transmitter differential signal pair. If in PCIe mode PCIe Lane 0 Tx  
50 PERST#   PCIe reset 0/3.3V
51 GND   Ground  
52 CLKREQ#   Reference clock request signal 0/3.3V
53 REFCLKN   PCIe Reference Clock signals (100 MHz)  
54 PEWAKE#   PCIe WAKE# Open Drain with pull up on platform. Active Low. 0/3.3V
55 REFCLKP   PCIe Reference Clock signals (100 MHz)  
56 MFG1  Manufacturing pin. Use determined by vendor.  
57 GND   Ground  
58 MFG2  Manufacturing pin. Use determined by vendor.  
59 ANTCTL0 In 0/1.8V
60 COEX3 In 0/1.8V
61 ANTCTL1 In 0/1.8V
62 COEX_TXD In 0/1.8V
63 ANTCTL2 In 0/1.8V
64 COEX_RXD In 0/1.8V
65 ANTCTL3 In 0/1.8V
66 SIM DETECT Out  
67 RESET# Out 0/1.8V
68 SUSCLK   32.768 kHz clock supply input provided by the Platform chipset 0/3.3V
69 CONFIG_1  Defines module type  
70 3.3V / VBAT   Supply pin 3.3V
71 GND  Ground  
72 3.3V / VBAT  Supply pin, 3.3V
73 GND  Ground  
74 3.3V / VBAT  Supply pin 3.3V
75 CONFIG_2 Defines module type  

 

CONFIG pins are set by the SSD to inform the host if the drive wishes to use the SATA or PCIe signaling scheme. SSD-SATA pull pin 1, pin 21, pin 69, pin 75 to Ground.
Config pins configuration:

Config_0
pin 21		 Config_1
pin 69		 Config_2
pin 75		 Config_3
pin 1		 Host Interface
0 0 0 0 SSD-SATA
0 1 0 0 SSD-PCIe
0 0 1 0

WWAN – PCIe (Port Configuration 0)
0 1 1 0 WWAN – PCIe (Port Configuration 1)
0 0 0 1

WWAN – PCIe, USB3.1 Gen1 (Port
Configuration 0)
0 1 0 1 WWAN – PCIe, USB3.1 Gen1 (Port
Configuration 1)
0 0 1 1 WWAN – PCIe, USB3.1 Gen1 (Port
Configuration 2)
0 1 1 1 WWAN – PCIe, USB3.1 Gen1 (Port
Configuration 3)
1 0 0 0

WWAN – SSIC (Port Configuration 0)
1 1 0 0 WWAN – SSIC (Port Configuration 1)
1 0 1 0 WWAN – SSIC (Port Configuration 2)
1 1 1 0 WWAN – SSIC (Port Configuration 3)
1 0 0 1 WWAN – PCIe (Port Configuration 2)
1 1 0 1 WWAN – PCIe (Port Configuration 3)
1 0 1 1 WWAN – PCIe, USB3.1 (vendor defined)
1 1 1 1 No Add-in card present

 

 

M.2 pinout for key M (1x SATA, 1x, 2x, or 4x PCIe)

Pin
Number		 Pin
Name		 Description Voltage
1 CONFIG_3   Defines module type  
2 3.3 V  Supply pin 3.3 V
3 GND   Ground  
4 3.3 V   Supply pin 3.3 V
5 PERn3   PCIe Lane 3 Rx  
6 N/A     
7 PERp3  PCIe Lane 3 Rx  
8 N/A    
9 GND   Ground  
10 DAS/DSS   Device Activity Signal / Disable Staggered Spinup  
11 PETn3   PCIe Lane 3 Tx  
12 3.3 V  Supply pin 3.3 V
13 PETp3  PCIe Lane 3 Tx  
14 3.3 V  Supply pin 3.3 V
15 GND  Ground  
16 3.3V  Supply pin 3.3 V
17 PERn2 PCIe Lane 2 Rx  
18 3.3 V  Supply pin 3.3 V
19 PERp2 PCIe Lane 2 Rx  
20 N/A     
21 CONFIG_0   Defines module type  
22 N/A     
23 PETn2  PCIe Lane 2 Tx  
24 N/A    
25 PETp2  PCIe Lane 2 Tx  
26 N/A    
27 GND   Ground  
28 N/A     
29 PERn1   PCIe Lane 1 Rx  
30 N/A     
31 PERp1   PCIe Lane 1 Rx  
32 N/A     
33 GND   Ground  
34 N/A     
35 PETn1   PCIe Lane 1 Tx  
36 N/A     
37 PETp1   PCIe Lane 1 Tx  
38 DEVSLP  Device Sleep, input. If driven high the host is informing the
SSD to enter a low power state.		  
39 GND   Ground  
40 N/A     
41 SATA-B+/PERn0  Host receiver differential signal pair. If in PCIe mode PCIe Lane 0 Rx  
42 N/A     
43 SATA-B-/PERp0  Host receiver differential signal pair. If in PCIe mode PCIe Lane 0 Rx  
44 N/A     
45 GND   Ground  
46 N/A     
47 SATA-A-/PETn0  Host transmitter differential signal pair. If in PCIe mode PCIe Lane 0 Tx  
48 N/A     
49 SATA-A+/PETp0   Host transmitter differential signal pair. If in PCIe mode PCIe Lane 0 Tx  
50 PERST#   PCIe reset  
51 GND   Ground  
52 CLKREQ#   Reference clock request signal  
53 REFCLKN   PCIe Reference Clock signals (100 MHz)  
54 PEWAKE#   PCIe WAKE# Open Drain with pull up on platform. Active Low.  
55 REFCLKP   PCIe Reference Clock signals (100 MHz)  
56 MFG1  Manufacturing pin. Use determined by vendor.  
57 GND   Ground  
58 MFG2  Manufacturing pin. Use determined by vendor.  
59-66 removed   Mechanical notch M  
67 N/A     
68 SUSCLK   32.768 kHz clock supply input provided by the Platform chipset  
69 CONFIG_1  Defines module type  
70 3.3 V   Supply pin 3.3 V
71 GND  Ground  
72 3.3 V Supply pin 3.3 V
73 GND  Ground  
74 3.3 V Supply pin 3.3 V
75 CONFIG_2 Defines module type  

M.2 dual module key A and E

Pin id. Pin name Description Voltage
1 GND Ground  
2 +3.3V power supply 3.3 V
3 USB_D+ USB high-, full-, and low- speed data pair positive  
4 +3.3V  power supply 3.3 V
5 USB_D- USB high-, full-, and low- speed data pair negative  
6 LED1#    
7 GND Ground  
8-15 Key Substrate removed to act as physical key  
16 LED2#    
17 DNC Do not connect  
18 GND Ground  
19 DNC Do not connect  
20 DNC Do not connect  
21 DNC Do not connect  
22 DNC Do not connect  
23-31 Key Substrate removed to act as physical key  
32 DNC Do not connect  
33 GND Ground  
34 DNC Do not connect  
35 PETp0 PCI Express lane 0 module transmitter pair positive  
36 DNC Do not connect  
37 PETn0 PCI Express lane 0 module transmitter pair negative  
38 Vendor defined    
39 GND Ground  
40 Vendor defined    
41 PERp0 PCI Express lane 0 module receiver pair positive  
42 Vendor defined    
43 PERn0 PCI Express lane 0 module receiver pair negative  
44 COEX3 Antenna coexistence signal 3  
45 GND Ground  
46 COEX2 Antenna coexistence signal 2  
47 PEFCLKP0 PCI Express reference clock pair positive  
48 COEX1 Antenna coexistence signal 1  
49 PEFCLKN0 PCI Express reference clock pair negative  
50 SUSCLK 32.768 kHz clock module input  
51 GND Ground  
52 PERST0# PCI Express reset  
53 CLKREQ0# PCI Express clock request  
54 W_DISABLE2# Wireless disable 2  
55 PEWake0# PCI Express wake  
56 W_DISABLE1# Wireless disable 1  
57 GND Ground  
58 SMB_DATA SMBus data signal  
59 Reserved    
60 SMB_CLK SMBus clock signal  
61 Reserved    
62 ALERT# SMBus alert signal  
63 GND Ground  
64 Reserved    
65 Reserved    
66 UIM_SWP    
67 Reserved    
68 UIM_POWER_SNK    
69 GND Ground  
70 UIM_POWER_SRC    
71 Reserved    
72 +3.3V power supply 3.3 V
73 Reserved    
74 +3.3V power supply 3.3 V
75 GND Ground  

M.2 module key E

Pin id. Pin name Description Voltage
1 GND Ground  
2 +3.3V 3.3 V power supply  
3 USB_D+ USB high-, full-, and low- speed data pair positive  
4 +3.3V 3.3 V power supply  
5 USB_D- USB high-, full-, and low- speed data pair negative  
6 LED1#    
7 GND Ground  
8

PCM_CLK/I2S SCK

 I/O 0/1.8V
9 SDIO CLK/SYSCLK Out 0/1.8V
10 PCM SYNC/I2S WS I/O 0/1.8V
11 SDIO CMD I/O 0/1.8V
12 PCM_IN/I2S_IN In 0/1.8V
13 SDIO DATA0 I/O 0/1.8V
14 PCM_OUT/I2S SD_OUT Out 0/1.8V
15 SDIO DATA1   0/1.8V
16 LED2# In  
17 SDIO DATA2 I/O 0/1.8V
18 GND Ground  
19 SDIO DATA3 I/O 0/1.8V
20 UART WAKE# In 0/3.3V
21 SDIO WAKE# In 0/1.8V
22 UART RxD In 0/1.8V
23 SDIO RESET#/TX_BLANKING Out 0/1.8V
24-31 Key E Substrate removed to act as physical key  
32 UART TxD Out 0/1.8V
33 GND Ground  
34 UART CTS In 0/1.8V
35 PETp0 PCI Express lane 0 module transmitter pair positive  
36 UART RTS Out 0/1.8V
37 PETn0 PCI Express lane 0 module transmitter pair negative  
38 Vendor defined    
39 GND Ground  
40 Vendor defined    
41 PERp0 PCI Express lane 0 module receiver pair positive  
42 Vendor defined    
43 PERn0 PCI Express lane 0 module receiver pair negative  
44 COEX3 Antenna coexistence signal 3 0/1.8V
45 GND Ground  
46 COEX_RxD In 0/1.8V
47 PEFCLKP0 PCI Express reference clock pair positive  
48 COEX_TxD Out 0/1.8V
49 PEFCLKN0 PCI Express reference clock pair negative  
50 SUSCLK 32.768 kHz clock module input 0/3.3V
51 GND Ground  
52 PERST0# PCI Express reset 0/3.3V
53 CLKREQ0# PCI Express clock request 0/3.3V
54 W_DISABLE2# Wireless disable 2 0/3.3V
55 PEWake0# PCI Express wake 0/3.3V
56 W_DISABLE1# Wireless disable 1 0/3.3V
57 GND Ground  
58 I2C_DATA I2c data signal 0/1.8V
59 Reserved/PETp1    
60 I2c_CLK I2C clock signal 0/1.8V
61 Reserved/PETn1    
62 ALERT# I2c Bus alert signal In 0/1.8V
63 GND Ground  
64 Reserved    
65 Reserved/PERp1    
66 UIM_SWP/PERST1#    
67 Reserved/PERn1    
68 UIM_POWER_SNK/CLKREQ1#    
69 GND Ground  
70 UIM_POWER_SRC/PEWAKE1#    
71 Reserved/REFCLKp1    
72 +3.3V power supply 3.3 V
73 Reserved/REFCLKn1    
74 +3.3V power supply 3.3 V
75 GND Ground  

M.2 module keying

 

Key
ID

Pin Location

Interface

A

8-15

2x PCIe x1 / USB 2.0 / I2C /DP x4

B

12-19

PCIe x2 / SATA /USB 2.0 / USB 3.0 / HSIC / SSIC / Audio / UIM / I2C

C

16-23

Reserved for Future Use

D

20-27

Reserved for Future Use

E

24-31

2x PCIe x1 / USB 2.0 / I2C / SDIO /
UART / PCM

F

28-35

Future Memory Interface (FMI)

G

39-46

Not Used for M.2; for Custom/Non-Standard Apps

H

43-50

Reserved for Future Use

J

47-54

Reserved for Future Use

K

51-58

Reserved for Future Use

L

55-62

Reserved for Future Use

M

59-66

PCIe x4 / SATA

M.2 SATA SSDs are B+M-keyed (can fit in sockets for B-keyed and M-keyed modules), while M.2 NVMe SSDs for PCIe 3.0 x4 lane are M-keyed.

M.2 key M.2 module size M.2 devices
A 1630, 2230, 3030 WiFi, Bluetooth, NFC and/or WiGig
E 1630, 2230, 3030 WiFi, Bluetooth, NFC and/or GPS/GNSS
B 3042, 2230, 2242, 2260, 2280, 22110 3G/LTE  + GPS/GNSS or SSD
M 2242, 2260, 2280, 22110 SSD with PCIe or SATA interface

 

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