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1. (WO1997017656) MICROCODE PATCHING APPARATUS AND METHOD
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/017656 International Application No.: PCT/US1996/011955
Publication Date: 15.05.1997 International Filing Date: 19.07.1996
Chapter 2 Demand Filed: 07.04.1997
IPC:
G06F 9/26 (2006.01) ,G06F 9/445 (2006.01)
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
9
Arrangements for programme control, e.g. control unit
06
using stored programme, i.e. using internal store of processing equipment to receive and retain programme
22
Micro-control or micro-programme arrangements
26
Address formation of the next micro-instruction
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
9
Arrangements for programme control, e.g. control unit
06
using stored programme, i.e. using internal store of processing equipment to receive and retain programme
44
Arrangements for executing specific programmes
445
Programme loading or initiating
Applicants:
ADVANCED MICRO DEVICES, INC. [US/US]; 5204 East Ben White Boulevard Mail Stop 562 Austin, TX 78741, US
Inventors:
GODDARD, Michael, D.; US
CHRISTIE, David, S.; US
Agent:
MILLER, Louise, K.; Advanced Micro Devices, Inc. 5204 East Ben White Boulevard M/S 562 Austin, TX 78741, US
BROOKES & MARTIN; "Association No. 14" High Holborn House 52/54 High Holborn London WC1V 6SE, GB
Priority Data:
08/553,20407.11.1995US
Title (EN) MICROCODE PATCHING APPARATUS AND METHOD
(FR) APPAREIL ET PROCEDE DE CORRECTION DE MICROCODE
Abstract:
(EN) A microcode patching method and apparatus provide for fetching of microcode from an external source which, under appropriate conditions, replaces direct reading of microcode from a microcode ROM. In a decoder having a capability to concurrently dispatch up to four instructions and each dispatch pathway having two alternative decoding pathways including a fastpath pathway and a microcode ROM pathway, a technique and apparatus for patching the microcode ROM is described. This technique and apparatus provide that execution codes from the microcode ROM are selectively replaced, during decoding, by codes taken from an external source, such as from an external memory via a byte queue.
(FR) Cette invention concerne un appareil et un procédé de correction de microcode, lequel procédé consiste à fournir un microcode qui provient d'une source extérieure et qui va, dans des conditions adéquates, remplacer la lecture directe d'un microcode dans une mémoire ROM de microcodes. Cette invention concerne également un appareil et une technique de correction de mémoire ROM de microcodes faisant appel à un décodeur capable de répartir simultanément jusqu'à quatre instructions, chaque voie de répartition possédant deux voies de décodage alternatives, à savoir une voie d'accès rapide et une voie de mémoire ROM de microcodes. Cette technique et cet appareil permettent de remplacer sélectivement, lors l'enregistrement, les codes d'exécution d'une mémoire ROM de microcodes par des codes provenant d'une source extérieure, par exemple, d'une mémoire extérieure via une file d'octets.
Designated States: JP, KR
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0859980JP2000500592