2. Hardware Description
System Description
80486
Microprocessor
The 80486 is a high performance
microprocessor with
on-chip memory management, floating point and cache
memory units. It is binary compatible with members of the 86
architectural family. The 486 CPU contains all the features of
the 386 CPU with enhancements to increase performance.
On-chip Floating Point Control Unit
The operation of the 486 microprocessor’s on-chip floating
point control unit is exactly the same as the 387 math
coprocessor. Software written for the 387 math coprocessor will
run on the on-chip floating point unit without any
modification. It occupies
address range of
and operates in parallel with the
arithmetic and logic unit and provides arithmetic instructions
for a variety of numeric data types.
On-chip Cache Memory
The
on-chip cache is a 4-way set associative write-through
code and data cache memory. Individual pages can be
designated as cacheable or non-cacheable by software or
hardware. The cache can also be enabled and disabled by
software or hardware.
Hardware Description
Summary of Contents for CH-486-33A
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