JPS5647830A - Buffer control unit - Google Patents
Buffer control unitInfo
- Publication number
- JPS5647830A JPS5647830A JP12454979A JP12454979A JPS5647830A JP S5647830 A JPS5647830 A JP S5647830A JP 12454979 A JP12454979 A JP 12454979A JP 12454979 A JP12454979 A JP 12454979A JP S5647830 A JPS5647830 A JP S5647830A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- equipment
- bytes
- buffer
- counter
- 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
- Information Transfer Systems (AREA)
Abstract
PURPOSE: To reduce a transfer time, by providing a buffer between the peripheral control equipment and the peripheral equipment, and transferring a data independently between the buffer and each equipment.
CONSTITUTION: In case it is desired to transfer 18 bytes to the peripheral equipment 32 from the central processing unit 33, the processing unit 33 writes 16 bytes in the first-in first-out (FIFO) memory 2 under control of the control equipment 32. The value of 11 is set to the counter 11, and the flip-flop (FF)121 is set. When transfer of a data of 1 byte has been finished, a pulse is sent out to a signal line 102, the value of the counter 11 is subtracted by 1, and in case of underflow, an output is generated in a signal line 101. As a result, FF121 is reset, FF14 is set, and the remaining 2 bytes are written in the memory 2. After that, FFs 13, 121 are set, and the same operation is executed. Transfer of the final byte is informed by FF13.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12454979A JPS5647830A (en) | 1979-09-27 | 1979-09-27 | Buffer control unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12454979A JPS5647830A (en) | 1979-09-27 | 1979-09-27 | Buffer control unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5647830A true JPS5647830A (en) | 1981-04-30 |
Family
ID=14888220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12454979A Pending JPS5647830A (en) | 1979-09-27 | 1979-09-27 | Buffer control unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5647830A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01120941U (en) * | 1988-02-09 | 1989-08-16 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4991342A (en) * | 1972-12-29 | 1974-08-31 |
-
1979
- 1979-09-27 JP JP12454979A patent/JPS5647830A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4991342A (en) * | 1972-12-29 | 1974-08-31 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01120941U (en) * | 1988-02-09 | 1989-08-16 |
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