System Overview 1-15
The 21264 microprocessor is a superscalar CPU with out-of-order execution and
speculative execution to maximize speed and performance. It contains four
integer execution units and dedicated execution units for floating-point add,
multiply, and divide. It has an instruction cache and a data cache on the chip.
Each cache is a 64 KB, two-way, set associative, virtually addressed cache that
has 64-byte blocks. The data cache is a physically tagged, write-back cache.
Each CPU card has a 4 MB secondary B-cache (backup cache) consisting of late-
write synchronous static RAMs (SRAMs) that provide low latency and high
bandwidth. Each CPU card also has a 5 ->2.2 volt power regulator that supplies
up to 100 watts at 2.2 volts to the CPU.
See Chapter 6 for CPU configuration.
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