JPS5668846A - Access system for control memory device - Google Patents
Access system for control memory deviceInfo
- Publication number
- JPS5668846A JPS5668846A JP14480279A JP14480279A JPS5668846A JP S5668846 A JPS5668846 A JP S5668846A JP 14480279 A JP14480279 A JP 14480279A JP 14480279 A JP14480279 A JP 14480279A JP S5668846 A JPS5668846 A JP S5668846A
- Authority
- JP
- Japan
- Prior art keywords
- alteration
- extension
- control unit
- address information
- giving
- 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 realize an alteration or extension of the contents of a control unit without giving any operation to the region where a writing is being given to the control unit, by giving an access to the extended part of the control unit based on the alteration/extension address information.
CONSTITUTION: In case an optional address is set to the address register 3, the alteration/extension address information read out of the index memory device 2 is selected by the selector 8 in response to the selection control signal SEL to be held at the register 3. At the same time, the selector 6 ignores the read output of the base part 1a of the control unit 1 in response to the signal SEL in case the alteration/ extension address information is read, and delivers the ineffective step. As a result, an access is given to the extended part 1b based on the alteration/extension address information. Thus an alteration or extension of the contents is possible for the unit 1 without giving any operation to the region 1a where a writing is already given in the unit 1.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14480279A JPS5668846A (en) | 1979-11-08 | 1979-11-08 | Access system for control memory device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14480279A JPS5668846A (en) | 1979-11-08 | 1979-11-08 | Access system for control memory device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5668846A true JPS5668846A (en) | 1981-06-09 |
Family
ID=15370796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14480279A Pending JPS5668846A (en) | 1979-11-08 | 1979-11-08 | Access system for control memory device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5668846A (en) |
-
1979
- 1979-11-08 JP JP14480279A patent/JPS5668846A/en active Pending
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