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On-Chip Microcoding of a Microprocessor with most Frequently used Instructions of f Large System and Primitives Suitable for Coding Remaining Instructions

IP.com Disclosure Number: IPCOM000049875D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-09

Publishing Venue

IBM

Related People

Authors:
Agnew, PW Buonomo, JP Houghtalen, SR Kellerman, AS Losinger, RE Valashinas, JW [+details]

Abstract

A microprocessor can have very short microcycle time with low power dissipation. However, currently foreseen microprocessors are limited to an on-chip control store of insufficient size to contain all of the microcode for a mainframe architecture. The most frequently used instructions, such as the fixed point and branching instructions, can be microcoded in a microprocessor's on-chip control store, but the rest of the architecture must be partitioned off the chip in some way.