Ultrasparc Iii Central Processing Unit (Cpu - Sun Microsystems Sun Blade 1000 Service Manual

C.1.2

UltraSPARC III Central Processing Unit (CPU)

The UltraSPARC III CPU is high-performance, highly-integrated, superscalar
processing module, that implements SPARC-V9, 64-bit, reduced instruction set
computer (RISC) architecture. The CPU module has been updated and improved to
further advance reliability, availability, scalability, and serviceability features of the
UltraSPARC III CPU module.
Note – There are now two groups of UltraSPARC III CPU modules. The
UltraSPARC III 600, 750, or 900 MHz CPU modules and the UltraSPARC III Cu CPU
modules.
The workstation's motherboard provides slots for two UltraSPARC III CPU modules.
Each processor module includes one CPU chip with integrated cache memory for
data and instructions, as well as up to 8 Mbytes of external static random access
memory (SRAM) cache memory.
The CPU modules communicate with the system's main memory and I/O
subsystem through the system's high-speed data bus. The system CPU modules are
automatically synchronized with the system bus that runs at clock speeds up to 150
MHz
The CPU is physically mounted on a module that plugs vertically into the system
motherboard. The module contains the processor and eight external cache SRAMs,
available either as 4-Mbyte (8 x 4-Mbit) SRAMs or as 8 Mbyte (8 x 8 Mbit) SRAMs.
The module also includes a DC-to-DC converter to limit the current density in the
connector at the male/female interface to provide better power regulation at the
pins of the processor.
C-4 Sun Blade 1000 and Sun Blade 2000 Service Manual • January 2002
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