Sun Microsystems, Inc.
Chapter 3
I/O Subsystem
Sun Fire X4600 I/O Subsystem Overview
The Sun Fire X4600 I/O subsystem is connected to the CPU complex through a HyperTransport link from
processors A and H. The I/O subsystem consists of the following components:
• One tunneling HyperTransport bridge (AMD-8132 HyperTransport PCI-X Tunnels)
• A HyperTransport-attached Southbridge component (NVIDIA nForce4 Professional 2200)
• A HyperTransport-attached Southbridge component (NVIDIA nForce4 Professional 2050)
• Flash memory for the BIOS
• Additional motherboard embedded peripheral I/O consisting of:
• One quad channel SAS RAID controller (LSI SAS1064) attached to one of the AMD-8132 PCI-X
Tunnels on a shared bus with the PCI-X slot 0.
• Two 10/100/1000 dual Gigabit Ethernet MAC/PHY devices (Intel FW82546GB NIC)
• A video controller device attached to the PCI bus of the Southbridge (ATI Rage XL)
• A Super I/O device connecting the Service Processor to the NVIDIA nForce4 Professional 2200 chip
Figure 3-1: Sun Fire X4600 Subsystem
Chipsets
The Sun Fire X4600 Server chipsets architecture consists of:
• HyperTransport interconnects (previously discussed)
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