Intel Phi 7120A SC7120A Data Sheet

Document ID Number: 328209 003EN

Intel

®

 Xeon Phi™ Coprocessor Datasheet

45

®

The PCI Express* connector for the Intel

®

 Xeon Phi™ coprocessor is a x16 interface 

and supports signals defined in the “PCI Express

*

Specification”. Signals called out in the PCI Express* specification but not used on the 
Intel

®

 Xeon Phi™ coprocessor are listed as “not used” in 

.

The symbol _N at the end of a signal name indicates that the active or asserted state 
occurs when the signal is at a low voltage level. When _N is not present after the signal 
name, the signal is asserted when at the high voltage level.

The following notations are used to describe the signal type:

I

Signal is an Input to the Intel

®

 Xeon Phi™ coprocessor

O

Signal is an Output from the Intel

®

 Xeon Phi™ coprocessor

I/O

Bidirectional Input/Output signal

S

Sense  pin

P

Power supply signal, sourced from the PCI Express* edge fingers or 
supplemental power connectors.

EXP_A_TX_[15:0]_DP
EXP_A_TX_[15:0]_DN

O 

PCI Express* Differential Transmit Pairs: 16-channel 
differential transmit pairs, referenced to the Intel

®

 

Xeon Phi™ coprocessor. The EXP_A_TX_[15:0]_DP and 
EXP_A_TX_[15:0]_DP are connected to the PCI 
Express* device transmit pairs on the Intel

®

 Xeon Phi™ 

coprocessor.

EXP_A_RX_[15:0]_DP
EXP_A_RX_[15:0]_DN

I

PCI Express* Differential Receive Pairs: 16-channel 
differential receive pairs referenced to the Intel

®

 Xeon 

Phi™ coprocessor. The EXP_A_RX_[15:0]_DP and 
EXP_A_RX_[15:0]_DP are connected to the PCI 
Express* device receive pairs on the Intel

®

 Xeon Phi™ 

coprocessor.

CK_PE_100M_16PORT_DP
CK_PE_100M_16PORT_DN

I

PCI Express* Reference Clock: 100MHz differential 
clock I to Intel® Xeon Phi™ coprocessor for use by the 
coprocessor to properly recover data from the PCI 
Express* Interface.

RST_PCIE_N

I

PCI Express* Reset Signal: RST_PCIE_N is a 3.3-volt 
active-low signal that when deasserted (high) indicates 
that the +12V and VCC3 power supplies are stable and 
within their specified tolerance.