JPS55976A - Code bit extension circuit of electronic digital computer - Google Patents
Code bit extension circuit of electronic digital computerInfo
- 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
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''.
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)
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 |
-
1979
- 1979-01-26 JP JP715779A patent/JPS55976A/en active Pending
Cited By (3)
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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