Datasheet

Product Overview
Intel
®
Xeon
®
and Intel
®
Core™ Processors For Communications Infrastructure
Datasheet - Volume 1 of 2 May 2012
20 Document Number: 327405
-001
• Static lane numbering reversal
— Does not support dynamic lane reversal, as defined (optional) by the PCI
Express Base Specification, Rev. 2.0.
• Supports Half Swing “low-power/low-voltage” mode.
Note: The processor does not support PCI Express* Hot-Plug.
2.4.3 Direct Media Interface (DMI)
• DMI 2.0 support.
• Four lanes in each direction.
• 2.5 GT/s and 5.0 GT/s
DMI interface to PCH
• Gen1 Raw bit-rate on the data pins of 2.5 GT/s, resulting in a real bandwidth per
pair of 250 MB/s given the 8b/10b encoding used to transmit data across this
interface. Does not account for packet overhead and link maintenance.
• Gen2 Raw bit-rate on the data pins of 5.0 GT/s, resulting in a real bandwidth per
pair of 500 MB/s given the 8b/10b encoding used to transmit data across this
interface. Does not account for packet overhead and link maintenance.
• Maximum theoretical bandwidth on interface of 2 GB/s in each direction
simultaneously, for an aggregate of 4 GB/s when DMI x4.
• Shares 100-MHz PCI Express* reference clock.
• 64-bit downstream address format, but the processor never generates an address
above 64 GB (Bits 63:36 will always be zeros).
• 64-bit upstream address format, but the processor responds to upstream read
transactions to addresses above 64 GB (addresses where any of Bits 63:36 are
nonzero) with an Unsupported Request response. Upstream write transactions to
addresses above 64 GB will be dropped.
• Supports the following traffic types to or from the PCH:
—DMI -> DRAM
— DMI -> processor core (Virtual Legacy Wires (VLWs), Resetwarn, or MSIs only)
— Processor core -> DMI
• APIC and MSI interrupt messaging support:
— Message Signaled Interrupt (MSI and MSI-X) messages
• Downstream SMI, SCI and SERR error indication.
• Legacy support for ISA regime protocol (PHOLD/PHOLDA) required for parallel port
DMA, floppy drive, and LPC bus masters.
• DC coupling – no capacitors between the processor and the PCH.
• Polarity inversion.
• PCH end-to-end lane reversal across the link.
• Supports Half Swing “low-power/low-voltage”.
2.4.4 Platform Environment Control Interface (PECI)
The PECI is a one-wire interface that provides a communication channel between a
PECI client (the processor) and a PECI master. The processors support the PECI 3.0
Specification.