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Chapter 5 Hardware Functional Descriptions 5-9
The XAUI interface is the Fabric interface to the ATCA midplane. The XAUI
interface is routed to the Zone 2 connector on the midplane (see Section A.4,
“Connectors and Pinout” on page A-3 for details on board connector pinout
assignments.
5.2.2 Memory Subsystem
The heart of the Memory subsystem is the FB-DIMM memory. Data from the
FB-DIMM memory controller is brought out on a high-speed serial bus that connects
to a single memory DIMM per channel. The FB-DIMM provides an Advanced
Memory Buffer (AMB) which converts this serial interface into the standard memory
interface used by DDR2 memory.
The UltraSPARC T2 provides 4 FB-DIMM memory controllers with each controller
supporting two memory channels.
5.2.2.1 Memory Capacity
The Netra CP3260 provides up to 8 FB-DIMM slots, two per memory controller. This
limits the maximum memory to 16 Gbytes if 2-Gbyte DIMMs are used, or 8 GBytes
if 1-Gbyte DIMMs are used.
5.2.2.2 Memory Speed
The target speed for FB-DIMMS is 667 MHz DDR2 RAMs which results in a
channeled speed of 4.0 Gbps.
5.2.3 I/O Subsystem
The Netra CP3260 I/O subsystem comprises of the following main features:
■ PCI Express switch interface
■ Dual 10/100/1000BASE-T Base interface ports to Zone 2 connector
■ Dual 1/10-Gbit XAUI ports for Fabric interface to Zone 2 connector
■ Common RTM interface via Zone 3 connector for rear access
■ Type II Compact Flash socket
■ Front panel I/O