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Microarchitectures

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Revision as of 16:57, 20 January 2011 by Dank (talk | contribs)

Microarchitecture is defined as those elements of a CPU design which are, to first order, invisible to application programmers (ie, not part of the instruction set). Those elements which are visible comprise the architecture.

x86 μarchitectures

FIXME: add early clones (NEC V20/V30, etc)

Microarchitecture Maker Date Process (min) Package ALU/data bits Addr bits Clock(s) ISA Notes
8086 Intel 1978 3.2 μm 40-pin DIP 16 20 4.77--10 MHz x86-16 Segmented memory

Optional 80-bit 8087 FP coprocessor

8088 Intel 1979 3.2 μm (?) 40-pin DIP

44-pin PLCC

16/8 20 4.77--10 MHz none Designed for use with 8-bit externals

Used in IBM PC-5150 / XT-5160 / PCjr-4860

80186 Intel 1982 2.6 μm 68-pin PLCC

68-pin PGA 100-pin PQFP

16 20 6--25 MHz 8086-2 (ENTER/LEAVE, PUSHA/POPA, INS/OUTS) Designed for embedded systems (clock, PIC, DMA on-die)
80286 Intel 1982 1.5 μm 68-pin PGA

68-pin CLCC 68-pin PLCC

16 24 4--12.5 MHz 8086-2 Introduced protected mode

Used in the IBM AT-5170