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with main memory, improving sequential PCI DMA performance. This approach minimizes J-Bus transactions for
I/O and enhances performance for I/O access to main memory. In addition, the JIO Hostbridge ASICs support PCI
DMA write and read bursts of 1 KB (32-bit PCI) and 2 KB (64-bit PCI) with no disconnect. 64-bit PCI DMA writes
execute at peak PCI bus throughput.
Each of the two JIO Hostbridge ASICs provides two 64-bit interfaces (one at 33 MHz, the other at 66 MHz) that
are compliant with the PCI 2.2 industry standard. Each J-Bus/PCI controller provides two PCI buses for a total of
four system PCI buses for internal and external controllers and devices. In turn, these PCI buses, depending on
the system, can support the following:
• Ultra160 SCSI controller (for internal disk drives) and external Ultra160 SCSI port (for arrays)
• Optional Sun Crypto Accelerator 500 module
• Two auto-negotiating Gigabit Ethernet controllers
• South Bridge general I/O ASIC
• One 64-bit, 33-MHz/66-MHz full-length PCI card slot
• Two 64-bit, 33-MHz half-length PCI card slots
South Bridge ASIC
The South Bridge ASIC, connecting to one of the JIO Hostbridge ASICs via one of its PCI interfaces, provides serial
and general I/O functionality which includes:
• An internal ATA (EIDE) connector to support the optional internal DVD-ROM/DVD-RW
• A standard EIA/TIA-574 (DB9) asynchronous serial interface using RS-232 levels
• Two USB v1.1 interfaces
The South Bridge ASIC also connects the System Management Controller ASIC that serves as a service processor
for the system’s ALOM remote management capabilities. ALOM remote system management can be accessed via
either the RJ-45 serial or 10BaseT Ethernet interfaces provided by the System Management Controller ASIC.
Chapter 3 provides more information on ALOM.
Internal Mass Storage
The Netra 240 server provides internal support for 160 MB/sec. Ultra160 SCSI devices. The internal disk drives are
hot-pluggable and accessed from the front, behind the front bezel of the system. The Netra 240 server supports
up to two 73-GB disks running at 15,000 rpm for a total internal capacity of 146 GB.
Networking and I/O Expansion
The Netra 240 server provides a full complement of networking and I/O expansion options through connectors on
the back panel.
Ethernet Ports
The Netra 240 server provides four standard 10/100/1000 Mbps (Gigabit) Ethernet connectors to support increas-
ing demands for both high bandwidth and multiple network connectivity. Gigabit Ethernet technology from Sun is
backwards compatible with 10 Mbps and 100 Mbps Ethernet, with the interface auto-negotiating the speed. All
four Ethernet interfaces on the Netra 240 server support access through an RJ-45 connector. An additional 10
Mbps Ethernet connection provides access to the System Management Controller ASIC and ALOM via a separate
RJ-45 connector.
Sun Microsystems, Inc.P10 Netra 240 Server Architecture