JPS5580872A - Microprogram loading system - Google Patents
Microprogram loading systemInfo
- Publication number
- JPS5580872A JPS5580872A JP15328578A JP15328578A JPS5580872A JP S5580872 A JPS5580872 A JP S5580872A JP 15328578 A JP15328578 A JP 15328578A JP 15328578 A JP15328578 A JP 15328578A JP S5580872 A JPS5580872 A JP S5580872A
- Authority
- JP
- Japan
- Prior art keywords
- memory
- region
- address
- contents
- writing
- 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
Landscapes
- Memory System Of A Hierarchy Structure (AREA)
Abstract
PURPOSE: To prevent the mistaken alteration for the region proper to the hardware of the control memory by inhibiting the writing of the contents of the main memory into the control memory in case the address to load the contents of the main memory into the control memory is outside the designation region.
CONSTITUTION: An access is given to the address which is designated by effective address register 19 in accordance with the contents of program counter 17, and then the order is read out of main memory 1. The contents of register 16 designated by part of the order read out is used as the writing address to control memory 2 and then applied to comparator 11 via operand register 13 to be then compared with the set value of lower and upper limit region registers 9 and 10 of firm region 4 which is to be rewritten in accordance with the program of memory 2 to be applied to comparator 11. And in case the writing address is outside the firm region range, the writing is inhibited for the data given to memory 2 from memory 1 by the inhibition signal delivered from comparator 11. As a result, the alteration due to the mistaken program can be prevented for region 3 proer to the hardware of memory 2.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15328578A JPS5580872A (en) | 1978-12-11 | 1978-12-11 | Microprogram loading system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15328578A JPS5580872A (en) | 1978-12-11 | 1978-12-11 | Microprogram loading system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5580872A true JPS5580872A (en) | 1980-06-18 |
Family
ID=15559122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15328578A Pending JPS5580872A (en) | 1978-12-11 | 1978-12-11 | Microprogram loading system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5580872A (en) |
-
1978
- 1978-12-11 JP JP15328578A patent/JPS5580872A/en active Pending
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