Ip45 Motherboard - Silicon Graphics Origin 300 User Manual

IP45 Motherboard

007-4498-002
The IP45 motherboard houses the following components:
• Two or four MIPS RISC processors (2-MB L2 cache per processor).
• Four dual-inline memory module (DIMM) slots that are organized as two banks of
memory per two DIMM slots (four banks total), and configurable from 512 MB to
4 GB of main memory. Refer to "Dual-inline Memory Modules (DIMMs)" on
page 126 for more information on DIMMs.
• Bedrock ASIC (or hub ASIC) that enables communication between the processors,
memory, and I/O devices.
• Xbridge ASIC that is the interface between the Bedrock ASIC and the PCI slots.
• Serial ID EEPROM that contains component information.
• L1 controller logic that monitors and controls the environment of the base module
(for example, fan speed, operating temperature, and system LEDs).
• VRMs that convert the incoming voltages to the voltage levels required by the
internal components.
• Light-emitting diodes (LEDs) that provide information about the NUMAlink port
and the processors:
• Two NUMAlink LEDs, controlled by the L1 controller.
• Four heartbeat LEDs (one for each processor), controlled by the Bedrock ASIC.
• Ports that provide connection to external components.
Note: Ports and LEDs are described in detail in "Rear Chassis Components" on
page 122.
SGI Origin 300 Base Module
125