M.2 Pins

From ElectroDragon Wiki

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

Pin Number Pin Name Description

  • 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 N/C
  • 6-8 N/A
  • 9 N/C
  • 10 DAS/DSS Device Activity Signal / Disable Staggered Spinup
  • 11 N/C
  • 12-19 removed Mechanical notch B
  • 20 N/A
  • 21 CONFIG_0 Defines module type
  • 22-26 N/A
  • 27 GND Ground
  • 28 N/A
  • 29 PERn1 / USB TX- PCIe Lane 1 Rx or USB 3.0 TX-
  • 30 N/A
  • 31 PERp1 / USB TX+ PCIe Lane 1 Rx or USB 3.0 TX+
  • 32 N/A
  • 33 GND Ground
  • 34 N/A
  • 35 PETn1 / USB RX- PCIe Lane 1 Tx or USB 3.0 RX-
  • 36 N/A
  • 37 PETp1 / USB RX+ PCIe Lane 1 Tx or USB 3.0 RX+
  • 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 pinout for key M (1x SATA, 1x, 2x, or 4x PCIe)

Pin Number Pin Name Description

  • 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

  • KEY-M SSD

M.2 Key A

M.2 Key E

  • KEY-E

M.2 dual module key A and E

Pin id. Pin name Description

  • 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 Key Substrate removed to act as physical key
  • 9 Key Substrate removed to act as physical key
  • 10 Key Substrate removed to act as physical key
  • 11 Key Substrate removed to act as physical key
  • 12 Key Substrate removed to act as physical key
  • 13 Key Substrate removed to act as physical key
  • 14 Key Substrate removed to act as physical key
  • 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 Key Substrate removed to act as physical key
  • 24 Key Substrate removed to act as physical key
  • 25 Key Substrate removed to act as physical key
  • 26 Key Substrate removed to act as physical key
  • 27 Key Substrate removed to act as physical key
  • 28 Key Substrate removed to act as physical key
  • 29 Key Substrate removed to act as physical key
  • 30 Key Substrate removed to act as physical key
  • 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 3.3 V power supply
  • 73 Reserved
  • 74 +3.3V 3.3 V power supply
  • 75 GND Ground
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