Sun Microsystems CP3260 Memory Subsystem, 5.2.3 I/O Subsystem, Memory Capacity, Memory Speed

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-3for details on board connector pinout assignments.

5.2.2Memory 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.

5.2.2.1Memory 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.

5.2.2.2Memory Speed

The target speed for FB-DIMMS is 667 MHz DDR2 RAMs which results in a channeled speed of 4.0 Gbps.

5.2.3I/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

Chapter 5 Hardware Functional Descriptions 5-9