JPS6486254A - Disk cache device - Google Patents
Disk cache deviceInfo
- Publication number
- JPS6486254A JPS6486254A JP62244534A JP24453487A JPS6486254A JP S6486254 A JPS6486254 A JP S6486254A JP 62244534 A JP62244534 A JP 62244534A JP 24453487 A JP24453487 A JP 24453487A JP S6486254 A JPS6486254 A JP S6486254A
- Authority
- JP
- Japan
- Prior art keywords
- data
- mpu
- host processor
- resetting
- undefined
- 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.)
- Granted
Links
Landscapes
- Debugging And Monitoring (AREA)
- Memory System Of A Hierarchy Structure (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Abstract
PURPOSE:To improve reliability by setting a data undefined flag added to writing data when a resetting instruction is made from a central processing unit while a storing-in action is executed. CONSTITUTION:A microprocessor MPU 1 latches the resetting instruction from a host processor 30 to a resetting latch 3. When the resetting latch 3 is not set until data transfer from the host processor 30 is completed, the MPU 1 resets the data undefined flag, and when the resetting latch 3 is set until then, the MPU 1 sets the data undefined flag. Thereafter, for a searching and reading instruction from the host processor 30, the MPU 1 investigates the data undefined flag in a designated field, and when the data undefined flag is set, the MPU 1 informs the host processor 30 that the data of an accessed field are undefined.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62244534A JPH0630076B2 (en) | 1987-09-28 | 1987-09-28 | Disk cache device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62244534A JPH0630076B2 (en) | 1987-09-28 | 1987-09-28 | Disk cache device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6486254A true JPS6486254A (en) | 1989-03-30 |
JPH0630076B2 JPH0630076B2 (en) | 1994-04-20 |
Family
ID=17120126
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62244534A Expired - Lifetime JPH0630076B2 (en) | 1987-09-28 | 1987-09-28 | Disk cache device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0630076B2 (en) |
-
1987
- 1987-09-28 JP JP62244534A patent/JPH0630076B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0630076B2 (en) | 1994-04-20 |
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