JPS55976A - Code bit extension circuit of electronic digital computer - Google Patents

Code bit extension circuit of electronic digital computer

Info

Publication number
JPS55976A
JPS55976A JP715779A JP715779A JPS55976A JP S55976 A JPS55976 A JP S55976A JP 715779 A JP715779 A JP 715779A JP 715779 A JP715779 A JP 715779A JP S55976 A JPS55976 A JP S55976A
Authority
JP
Japan
Prior art keywords
operation mode
code
data
bit extension
digital computer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP715779A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Asada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP715779A priority Critical patent/JPS55976A/en
Publication of JPS55976A publication Critical patent/JPS55976A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To constitute a bit extension circuit with its physical mechanism simplified using no gate circuits, by making use of a resister file composed of ordinary RAM used for an electronic digital computer in general. CONSTITUTION:This circuit is provided with RAMs 24 to 27 constituting the register file of upper bits and lower bits which has read, write and passing operation modes and a non-operation mode by the lower bits of the basic length equivalent to input-code numeric data, and numeral data with a code shorter than the basic word length is converted into numeric data with a code of the basic word length. By combining a ME signal and WE signal, the register file is set to write, read or passing operation mode or the non-operation mode and a code-bit extension indication signal is supplied to AND and OR gates 21 and 23; switching to the non-operation mode in which the output is zero when input code numeric data is zero is done and switching to the operation mode in which all-''1'' data written previously is read out when data is ''1'' to make upper bits ''1''.
JP715779A 1979-01-26 1979-01-26 Code bit extension circuit of electronic digital computer Pending JPS55976A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP715779A JPS55976A (en) 1979-01-26 1979-01-26 Code bit extension circuit of electronic digital computer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP715779A JPS55976A (en) 1979-01-26 1979-01-26 Code bit extension circuit of electronic digital computer

Publications (1)

Publication Number Publication Date
JPS55976A true JPS55976A (en) 1980-01-07

Family

ID=11658227

Family Applications (1)

Application Number Title Priority Date Filing Date
JP715779A Pending JPS55976A (en) 1979-01-26 1979-01-26 Code bit extension circuit of electronic digital computer

Country Status (1)

Country Link
JP (1) JPS55976A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01147440U (en) * 1988-03-31 1989-10-12
WO1990010903A1 (en) * 1989-03-15 1990-09-20 Oki Electric Industry Co., Ltd. Serial data receiving circuit
US6070236A (en) * 1996-12-19 2000-05-30 Deutsche Thomson-Brandt Gmbh Apparatus for processing a sequence of control commands as well as a method for generating a sequence of control commands, and storage medium for storing control commands

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01147440U (en) * 1988-03-31 1989-10-12
WO1990010903A1 (en) * 1989-03-15 1990-09-20 Oki Electric Industry Co., Ltd. Serial data receiving circuit
US6070236A (en) * 1996-12-19 2000-05-30 Deutsche Thomson-Brandt Gmbh Apparatus for processing a sequence of control commands as well as a method for generating a sequence of control commands, and storage medium for storing control commands

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