Datasheet

Packaging and Signal Information
Intel
®
Xeon
®
Processor C5500/C3500 Series
Datasheet, Volume 1 February 2010
418 Order Number: 323103-001
12.0 Packaging and Signal Information
12.1 Signal Descriptions
This chapter describes the processor signals. They are arranged in functional groups
according to their associated interface or category. All straps are only a weak pulldown
needed if a Vss is desired. The following notations describe the signal types:
12.1.1 Intel
®
QPI Signals
Notations Signal Type
I Input pin
OOutput pin
I/O Bi-directional input/output pin
Analog Analog reference or output
Table 135. Intel
®
QPI Signals
Signal Names
I/O
Type
Description
QPI_CLKRX_DP
QPI_CLKRX_DN
IIntel
®
QuickPath Interconnect Received Clock.
QPI_CLKTX_DP
QPI_CLKTX_DN
OIntel
®
QuickPath Interconnect Forwarded Clock.
QPI_COMP[1:0] I
Intel
®
QuickPath Interconnect Compensation: Used for the external impedance
matching resistors. Must be terminated on the system board using precision
resistor.
QPI_RX_DN[19:0]
QPI_RX_DP[19:0]
IIntel
®
QuickPath Interconnect Data Input.
QPI_TX_DN[19:0]
QPI_TX_DP[19:0]
OIntel
®
QuickPath Interconnect Data Output.