JPS61144143A - Two-way bus circuit - Google Patents

Two-way bus circuit

Info

Publication number
JPS61144143A
JPS61144143A JP26533284A JP26533284A JPS61144143A JP S61144143 A JPS61144143 A JP S61144143A JP 26533284 A JP26533284 A JP 26533284A JP 26533284 A JP26533284 A JP 26533284A JP S61144143 A JPS61144143 A JP S61144143A
Authority
JP
Japan
Prior art keywords
signal level
state
change
significant state
data signal
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
JP26533284A
Other languages
Japanese (ja)
Inventor
Hisao Watanabe
Original Assignee
Nec Corp
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 Nec Corp filed Critical Nec Corp
Priority to JP26533284A priority Critical patent/JPS61144143A/en
Publication of JPS61144143A publication Critical patent/JPS61144143A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To switch a signal level flowing direction automatically by taking a direction of a signal level change toward the significant state as an enable- state and the unchanged direction as a disenable state with priority depending on the signal level change in a bus circuit switching the data signal flow and the like in two-way.
CONSTITUTION: When a signal level of any data signal line changes from a non-significant state into a significant state, the change is detected by a signal level change detecting circuit 13(14) in a signal direction automatic switching function. As a result, the direction of data signal flowing is switched automatically by giving a disenable input from the detection circuit 13(14) to a bus driver 12(11). The priority between the detection circuits 13 and 14 is controlled by the hard flag system. The priority is given depending on the change from the significant state of the signal level of the corresponding data signal line to the non-significant state.
COPYRIGHT: (C)1986,JPO&Japio
JP26533284A 1984-12-18 1984-12-18 Two-way bus circuit Pending JPS61144143A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26533284A JPS61144143A (en) 1984-12-18 1984-12-18 Two-way bus circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26533284A JPS61144143A (en) 1984-12-18 1984-12-18 Two-way bus circuit

Publications (1)

Publication Number Publication Date
JPS61144143A true JPS61144143A (en) 1986-07-01

Family

ID=17415715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26533284A Pending JPS61144143A (en) 1984-12-18 1984-12-18 Two-way bus circuit

Country Status (1)

Country Link
JP (1) JPS61144143A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02222236A (en) * 1989-02-22 1990-09-05 Matsushita Electric Ind Co Ltd Communication equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02222236A (en) * 1989-02-22 1990-09-05 Matsushita Electric Ind Co Ltd Communication equipment

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