Intel E5-4600 Processor Signaling, System Memory Interface Signal Groups, PCI Express* Signals

Electrical Specifications

7Electrical Specifications

7.1Processor Signaling

The processor includes 2011 lands, which utilize various signaling technologies. Signals are grouped by electrical characteristics and buffer type into various signal groups. These include DDR3 (Reference Clock, Command, Control, and Data), PCI Express*, DMI2, Intel QuickPath Interconnect, Platform Environmental Control Interface (PECI), System Reference Clock, SMBus, JTAG and Test Access Port (TAP), SVID Interface, Processor Asynchronous Sideband, Miscellaneous, and Power/Other signals. Refer to Table 7-5for details.

Detailed layout, routing, and termination guidelines corresponding to these signal groups can be found in the applicable platform design guide (Refer to Section 1.7, “Related Documents”).

Intel strongly recommends performing analog simulations of all interfaces. Please refer to Section 1.7, “Related Documents” for signal integrity model availability.

7.1.1System Memory Interface Signal Groups

The system memory interface utilizes DDR3 technology, which consists of numerous signal groups. These include: Reference Clocks, Command Signals, Control Signals, and Data Signals. Each group consists of numerous signals, which may utilize various signaling technologies. Please refer to Table 7-5for further details. Throughout this chapter the system memory interface maybe referred to as DDR3.

7.1.2PCI Express* Signals

The PCI Express* Signal Group consists of PCI Express* ports 1, 2, and 3, and PCI Express* miscellaneous signals. Please refer to Table 7-5for further details.

7.1.3DMI2/PCI Express* Signals

The Direct Media Interface Gen 2 (DMI2) sends and receives packets and/or commands to the PCH. The DMI2 is an extension of the standard PCI Express* Specification. The DMI2/PCI Express* Signals consist of DMI2 receive and transmit input/output signals and a control signal to select DMI2 or PCIe* 2.0 operation for port 0. Please refer to Table 7-5for further details.

7.1.4Intel QuickPath Interconnect (Intel QPI)

The processor provides two Intel QPI port for high speed serial transfer between other processors. Each port consists of two uni-directional links (for transmit and receive). A differential signaling scheme is utilized, which consists of opposite-polarity (DP, DN) signal pairs.

Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families	153
Datasheet Volume One