C-6 Sun Ultra 45 and Ultra 25 Workstations Service and Diagnostics Manual • May 2006
FIGURE C-3 Sun Ultra 45 Motherboard Block Diagram
C.2.2 CPU Description
The UltraSPARC IIIi processor is a high-performance, highly integrated superscalar
processor. It is capable of sustained execution of four instructions per cycle, even
with conditional branches and cache misses. Instructions are issued in program
order to multiple functional units, and executed in parallel. Instructions from two
basic blocks are issued in the same group to further increase the number of
instructions executed per cycle.
The UltraSPARC IIIi CPU supports full implementation of the 64-bit SPARC-V9
architecture, a 64-bit virtual address space, and a 43-bit physical address space. The
core instruction set includes graphics instructions that provide the most common
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