Octek Hippo-SX, Руководство пользователя

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GENERAL FEATURES
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PROCESSOR
80486SX is the powerful microprocessor which
merges many innovative features on a single chip,
suitable for commercial applications and advanced
operation systems. 80486SX is a 32-bit microprocessor
with 32-bit external data bus and 32-bit external address
bus. It is fully binary compatible with existing Intel's
CPU. All existing software for PC XT/AT can be used on
OCTEK Hippo-SX.
Cache memory can improve the overall
performance of a computer system. Nevertheless, if the
cache memory is separated from CPU, CPU still needs to
fetch code and data from external bus. That means the
data transfer rate should not be too fast to allow the
external devices to keep pace with the CPU. In 80486SX,
the cache controller and cache memory are integrated
into the chip. Most of the operations can be carried out
inside the CPU, which reduces the bus operation on
external data and address bus and thus speeds up the
internal execution.
The cache memory is a 8K bytes, 16 bytes line
size, four-way set associative configuration. The hit rate
of this configuration is much better than 32K bytes two-
way set associative external cache because a four-way
set associative architecture provides better performance
in a multitasking and multi-processor environment.