JPS5650427A - Data transfer unit - Google Patents
Data transfer unitInfo
- Publication number
- JPS5650427A JPS5650427A JP12761279A JP12761279A JPS5650427A JP S5650427 A JPS5650427 A JP S5650427A JP 12761279 A JP12761279 A JP 12761279A JP 12761279 A JP12761279 A JP 12761279A JP S5650427 A JPS5650427 A JP S5650427A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- error
- data
- buffer
- status information
- 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 shorten the data transfer time for transmission to peripheral devices and reduce the hardware quantity, by transmitting all data which are read till error detection and by transmitting status information.
CONSTITUTION: When presence or absence of errors of read data from memory 2 is detected by memory error detecting circuit 5 of data transfer unit 1, error status information is generated according to the error condition. Circuit 5 reports errors to memory read request control circuit 6, and circuit 6 reports errors to buffer address circuit 7. Circuit 5 uses error flag set line 110 to set error flag bit 13 to buffer 4 and writes error status information, which should be buffer data, the error flag, and the parity, which is generated from the error flag and information, to the address of buffer 4. Succeeding data requests from one peripheral device 3-a or 3-b are suppressed by circuit 7, and data from the other device 3-b or 3-a is transferred.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12761279A JPS5650427A (en) | 1979-10-02 | 1979-10-02 | Data transfer unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12761279A JPS5650427A (en) | 1979-10-02 | 1979-10-02 | Data transfer unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5650427A true JPS5650427A (en) | 1981-05-07 |
Family
ID=14964388
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12761279A Pending JPS5650427A (en) | 1979-10-02 | 1979-10-02 | Data transfer unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5650427A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58189717A (en) * | 1982-04-30 | 1983-11-05 | Hitachi Ltd | Interlocking system of data exchange |
-
1979
- 1979-10-02 JP JP12761279A patent/JPS5650427A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58189717A (en) * | 1982-04-30 | 1983-11-05 | Hitachi Ltd | Interlocking system of data exchange |
JPS6245573B2 (en) * | 1982-04-30 | 1987-09-28 | Hitachi Ltd |
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