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Chapter 5 Hardware Functional Descriptions 5-3
There are four on-chip memory controllers that interface directly to FB-DIMM
memory and include eight FB-DIMM slots (one per channel, or two per memory
controller). In addition, there are an on-chip PCI-Express I/O interface and two
10-Gb Ethernet ports. The UltraSPARC T2 processor is a highly integrated processor
that implements the 64-bit SPARC V9 architecture.
5.1.2 I/O
All I/O is provided via the UltraSPARC T2 PCI-Express interface. A PLX switch
provides the PCI-E interfaces. Dual Intel NICs (or network adapters) supply the two
Ethernet interfaces to the front panel and the ARTM for management interfaces.
5.1.3 Base and Fabric Interfaces
The Base interface extends from the Intel 82571 NIC connected to the PCI-E switch
via a x4 connection. The PCI-E switch then connects to the Power PC and to the Base
interface.
The Fabric interface uses the processor’s XAUI interface and connects to the
midplane fabric interface.
5.1.4 Additional I/O
The additional I/O includes:
■ RS-232 Serial Port
■ IDE port for Compact Flash card
■ Dual USB ports
A PCI-E-to-PCI bridge provides an on-board local PCI bus to a PCI-to-USB device
that provides the USB ports. Two USB ports connect to the front panel and one USB
port connects to an USB-to-IDE bridge. The USB-to-IDE bridge supplies the IDE
interface for the Compact Flash.
5.1.5 Power PC
The RMII port on the Power PC connects to the Base interface through an Ethernet
switch.