JPS6488841A - Buffer memory access control system - Google Patents
Buffer memory access control systemInfo
- Publication number
- JPS6488841A JPS6488841A JP62246877A JP24687787A JPS6488841A JP S6488841 A JPS6488841 A JP S6488841A JP 62246877 A JP62246877 A JP 62246877A JP 24687787 A JP24687787 A JP 24687787A JP S6488841 A JPS6488841 A JP S6488841A
- Authority
- JP
- Japan
- Prior art keywords
- value
- register
- bit
- microinstruction
- buffer memory
- 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
- Executing Machine-Instructions (AREA)
- Memory System Of A Hierarchy Structure (AREA)
Abstract
PURPOSE:To reduce the overhead of firmware processing to increase the processing speed by indicating whether the value of a base address register should be referred or not in accordance with the value of a modify bit provided in a microinstruction. CONSTITUTION:A modify bit 10 is included besides various operands in the microinstruction. When the bit 10 in the microinstruction is '0', a microprocessor 5 accesses a buffer memory 4 by the address obtained by adding the value in an index address register 2 to the value in a base address register 1 outputted from a gate circuit 3. When the bit 10 is '1', a signal is sent to the circuit 3 and the circuit 3 does not output the value in the register 1 but outputs '0' by this signal, and therefore, the microprocessor 5 accesses the memory 4 by only the value in the register 2, namely, a common address. Thus, areas assigned to respective devices and an area common to all devices are freely accessed without complicated processings of save and store of the register 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62246877A JPS6488841A (en) | 1987-09-30 | 1987-09-30 | Buffer memory access control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62246877A JPS6488841A (en) | 1987-09-30 | 1987-09-30 | Buffer memory access control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6488841A true JPS6488841A (en) | 1989-04-03 |
Family
ID=17155067
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62246877A Pending JPS6488841A (en) | 1987-09-30 | 1987-09-30 | Buffer memory access control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6488841A (en) |
-
1987
- 1987-09-30 JP JP62246877A patent/JPS6488841A/en active Pending
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