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68 pin U.2 (SFF-8639) SATA Express схематический вид разъема
Разъем 68 pin U.2 (SFF-8639) SATA Express
U.2 (SFF-8639) is a computer interface for connecting SSDs to a computer. It is developed for the enterprise market and designed to support new PCI Express drives along with SAS and SATA drives.

U.2 connector is a combination/ extension of the existing SATA and SAS connectors, which offer up to 4x PCIe 3.0 lanes to a connected device. The Enterprise SSD form factor was released on December 20, 2011 by SFFWG, as a mechanism for providing PCI Express connections to SSDs for the enterprise market. Goals included supporting existing 2.5 and 3.5 mechanical enclosures, to be hot swappable and to allow legacy SAS and SATA drives to be mixed using the same connector family.

The U.2 connector is mechanically identical to the SATA Express device plug, but provides four PCI Express lanes through a different usage of available pins. U.2 devices may be connected to an M.2 port using an adapter.

Pin
Number
Pin
Name
Signal
description
Interface
S1 GND Ground  
S4 GND Ground  
S7 GND Ground  
S8 GND Ground  
S11 GND Ground  
S14 GND Ground  
S16 GND Ground  
S17 PETp1 ePCIe 1 Enterprise PCIe 
S18 PETn1 ePCIe 1 Enterprise PCIe 
S19 GND Ground  
S20 PERn1 ePCIe 1 Enterprise PCIe 
S21 PERp1 ePCIe 1 Enterprise PCIe 
S22 GND Ground  
S23 PETp2 ePCIe 2 Enterprise PCIe 
S24 PETn2 ePCIe 2 Enterprise PCIe 
S25 GND Ground  
S26 PERn2 ePCIe 2  
S27 PERp2 ePCIe 2  
S28 GND Ground  
P1 Wake# WAKE# SATA Express + SAS x4
P3 PWRDIS PWRDIS SATA Express
P4 IfDet# Interface Detect (Was GND-precharge) SATA Express + Enterprise PCIe
P5 GND Ground  
P6 GND Ground  
P10 PRSNT# Presence (Drive type) all
P11 Activity Activity(output) all
P12 GND Hot Plug Ground  
P13 +12V 12V supply Precharge all
P14 +12V 12V supply all
P15 +12v 12V supply all
E1 RefClk1+ ePCIe RefClk + (port B) Dual Port
E2 RefClk1- ePCIe RefClk – (port B) Dual Port
E3 3.3Vaux 3.3V for SM bus Enterprise PCIe opt
E4 CLKREQ/ePERstB# ePCIe Reset (port B) Dual Port
E5 PERst# ePCIe Reset (port A) Enterprise PCIe opt
E6 RSVD Reserved  
E7 RefClk+ ePCIe Primary RefClk + Enterprise PCIe
E8 RefClk- ePCIe Primary RefClk - Enterprise PCIe
E9 GND Ground  
E10 PETp0 ePCIe 0 Transmit + Enterprise PCIe
E11 PETn0 ePCIe 0 Transmit - Enterprise PCIe
E12 GND Ground  
E13 PERn0 ePCIe 0 Receive - Enterprise PCIe
E14 PERp0 ePCIe 0 Receive + Enterprise PCIe
E15 GND Ground  
E16 RSVD Reserved  
E17 PETp3 ePCIe 3 Transmit + Enterprise PCIe 
E18 PETn3 ePCIe 3 Transmit - Enterprise PCIe 
E19 GND Ground  
E20 PERn3 ePCIe 3 Enterprise PCIe
E21 PERp3 ePCIe 3 Enterprise PCIe
E22 GND Ground  
E23 SMBCLK    
E24 SMBDAT    
E25 DualPortEn#    

PCIe names the signals on the device from the host perspective i.e. for PCIe products, a receiver on the device has a transmitter signal name.

The PETpx and PETnx pins shall be connected to the PCI Express Receiver differential pair on the SATA Express device or PCIe module. The PERpx and PERnx pins shall be connected to the PCI Express Transmitter differential pair on the SATA Express device or PCIe module.

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