C-4 Sun Ultra 45 and Ultra 25 Workstations Service and Diagnostics Manual • May 2006
C.1.3 Component Overview
This section describes some primary motherboard components.
C.1.3.1 CPU
■ UltraSPARC IIIi 1.6-GHz CPU for the Sun Ultra 45, UltraSPARC IIIi 1.34-GHz
CPU for the Sun Ultra 25.
■ Integrated L1 caches (data, instruction, prefetch, and write)
■ Integrated 1-Mbyte L2 data cache
■ System bus – I/O bridge, JBus frequency up to 200 MHz.
C.1.3.2 Memory Subsystem
■ Integrated DDR-1 SDRAM 266-MHz memory controller
■ Memory – up to eight DDR-1 SDRAM 266-MHz registered DIMMs, (four per
CPU) for the Sun Ultra 45, up to four DDR-1 SDRAM 266-MHz registered
DIMMs, (four per CPU) for the Sun Ultra 25.
■ 16 GBytes for dual CPU, 8 GBytes of memory for single CPU
C.1.3.3 I/O Bridge Chip
■ Sun Microsystems I/O bridge ASIC
■ JBus
■ 200-MHz bandwidth
■ 128-bit wide MUX address and data bus
■ Dual PCI buses
■ PCI-X compliant
■ 8 x 64-byte I/O cache each bus
■ Fully associative I/O memory management unit on each bus
■ PCI-E 2 long connector is 16 lane capable, running 8 lanes
■ PCI-E 1 long connector is 16 lane capable, running 8 lanes
■ PCI-E 0 short connector is 8 lane capable, running at 4 lanes
C.1.3.4 I/O Subsystem
■ UltraDMA ATA 133 controller
■ AC-97 compliant audio interface
■ USB 2.x interface
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