Title: Data processing device for variable length multibyte data fields

Abstract: A data processing device for variable length formats includes a control unit and a storage unit coupled to the control unit. Two data exchange buses are each coupled to a respective data input and to a respective data output of the storage unit. Two switches are coupled to the control unit and to respective data exchange buses. An arithmetic/logic unit is coupled to the control unit, to the switches and to the storage unit. A data shaft unit is coupled to the data exchange buses and to the control unit. A data masking unit is coupled to the data exchange buses, to the control unit and to the switches. This device enables the preparation for processing of multibyte data fields arbitrarily arranged with respect to the word boundaries in main storage. The data shift unit provides automatic alignment of the bytes of the operands relative to each other. The data masking unit masks irrelevant bytes of the first and last words of each operand.

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Inventors: Gusev, Valery F.
Ivanov, Gennady N.
Kontarev, Vladimir Y.
Krengel, Genrikh I.
Polivoda, Evgeny O.
Skvortsov, Alexandr N.
Schetinin, Jury I.
Kremlev, Vyacheslav Y.
Shagivaleev, Mansur Z.
Yarmukhametov, Azat U.

Application Number: 887531
Filing Date: 1978-03-17
Publication_date: 1980-08-26
Assignee:
Primary Class(es): 712/300
Other Classes:
US Patent Ref:

2930028	Mar, 1960	Johnson et al.	364/900.
3370274	Feb, 1968	Kettley et al.	364/200.
3430202	Feb, 1969	Downing et al.	364/200.
3571803	Mar, 1971	Huttenhoff et al.	364/900.
3906459	Sep, 1975	Desmonds et al.	364/900.
3969704	Jul, 1976	Liebe, Jr.	364/900.
3982229	Sep, 1976	Rouse et al.	364/200.
4023023	May, 1977	Bourrez et al.	364/200.
4109310	Aug, 1978	England et al.	364/200.

Other Refs:
Primary Examiner: Chapnick, Melvin B.
Assistant Examiner:
Attorney: Lackenbach, Lilling & Siegel