JPS55108030A - Data transfer control system - Google Patents

Data transfer control system

Info

Publication number
JPS55108030A
JPS55108030A JP1535379A JP1535379A JPS55108030A JP S55108030 A JPS55108030 A JP S55108030A JP 1535379 A JP1535379 A JP 1535379A JP 1535379 A JP1535379 A JP 1535379A JP S55108030 A JPS55108030 A JP S55108030A
Authority
JP
Japan
Prior art keywords
data
retrieval
buffer
agreement
read out
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
Application number
JP1535379A
Other languages
Japanese (ja)
Inventor
Hiroo Miyadera
Shigeo Nagashima
Kenji Hayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1535379A priority Critical patent/JPS55108030A/en
Publication of JPS55108030A publication Critical patent/JPS55108030A/en
Pending legal-status Critical Current

Links

Landscapes

  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

PURPOSE: To reduce the data access time, by receiving the conditions of retrieval as the channel command word from CPU at the data base machine and transmitting the data in agreement with the conditions designated among the data read out from the data memory unit to CPU.
CONSTITUTION: As the channel command word from CPU11, the range of retrieval in the data memory unit being the retrieval objective of data and the retrieval condition based on the data content are fed to the main control section 31 of data base machine and the retrieval condition set register 33, and the address designated at the command from the disc unit is read out to the disc buffer 32. Next, the retrieval condition between the buffer 32 and the register 33 is compared at the comparison circuit 35, and if in agreement, the gate 36 is open and the output read out from the buffer 32 is written in the output buffer 37, the control section 31 judges the state of the buffer 37 and the data in agreement with the condition is transmitted to CPU11 via the gate 38.
COPYRIGHT: (C)1980,JPO&Japio
JP1535379A 1979-02-13 1979-02-13 Data transfer control system Pending JPS55108030A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1535379A JPS55108030A (en) 1979-02-13 1979-02-13 Data transfer control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1535379A JPS55108030A (en) 1979-02-13 1979-02-13 Data transfer control system

Publications (1)

Publication Number Publication Date
JPS55108030A true JPS55108030A (en) 1980-08-19

Family

ID=11886423

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1535379A Pending JPS55108030A (en) 1979-02-13 1979-02-13 Data transfer control system

Country Status (1)

Country Link
JP (1) JPS55108030A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60178573A (en) * 1984-02-24 1985-09-12 Hitachi Ltd Data base processing system
JPS648474A (en) * 1987-07-01 1989-01-12 Canon Kk Document forming device
JP2015106413A (en) * 2013-11-28 2015-06-08 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． Data storage device including internal hardware filter and operation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60178573A (en) * 1984-02-24 1985-09-12 Hitachi Ltd Data base processing system
JPS648474A (en) * 1987-07-01 1989-01-12 Canon Kk Document forming device
JP2015106413A (en) * 2013-11-28 2015-06-08 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． Data storage device including internal hardware filter and operation method thereof
US10210196B2 (en) 2013-11-28 2019-02-19 Samsung Electronics Co., Ltd. Data storage device having internal hardware filter, data storage method and data storage system

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