[특허]Bus system

Bus system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06F-013/42
출원번호	US-0675800 (1984-11-28)
발명자 / 주소	Wheelwright Lynn M. (Santa Rosa CA) Harmon William B. (Santa Rosa CA) Coffron James W. (Santa Rosa CA)
출원인 / 주소	Hewlett-Packard Company (Palo Alto CA 02)
인용정보	피인용 횟수 : 23 인용 특허 : 0

초록 ▼

A bus system is disclosed in which stations having a message to send request access to a parallel bus and an arbitrator responding to the requests connects the transmitters of the stations to the bus in sequence. The words of a message placed on the bus respectively represent the address of the station to which the message is to be delivered, the address of the sending station, and data. A station asserts a signal on one control line in response to its address being on the bus and asserts a signal on another control line if it cannot receive a message. Whether the entire message is placed on the bus or not by the sending station and loaded into the registers of the receiving station depends on whether or not their signals are asserted. An external data transfer means places signals to a station on another parallel bus on an external bus. The external bus is in the form of a loop so that the message eventually returns to the station that sent it. Bits are added to certain of the words in the message when it starts around the loop and the logic level of these bits when they return to the station that sent the message indicates whether the station to which the message was sent exists and, if so, whether or not the message was delivered.

대표청구항 ▼

A bus system comprising a mainframe having a parallel internal bus, a group of stations each having an internal transmitter for placing the words of a message on said bus when enabled and having internal data transfer means for receiving messages on said bus, each of said stations having an address, an input, an external transmitter for placing words at said input on said internal bus in order when enabled to do so, an output, an external data transfer means for transferring words from said internal bus to said output, all of said transmitters having means for asserting a request-to-send signal when they have a message to send, an arbitrator, first individual lines respectively connected between said transmitters and said arbitrator for conveying request-to-send signals to said arbitrator from said transmitters, means in each transmitter for placing a request-to-send signal on its first individual line when it has a message to send, second individual lines for conveying clear-to-send signals from said arbitrator to said transmitter, said arbitrator having means for sending clear-to-send signals in sequence via said second individual lines to those of said transmitters including said external transmitter that have asserted a request-to-send signal so as to enable them to respectively start placing words of a message on said internal bus, said transmitters having means, when enabled, for placing words on said bus to the order of: a TO word that is the address of the station to which the message is to go; a FROM word that is the address of the station sending the message; and a plurality of data words, first and second control lines respectively connected to said arbitrator, said stations and said external data transfer means, said stations having means for asserting a signal on said first control line when a TO word on said internal bus is its address and means, when the station is addressed, for asserting a signal on said second control line before all the words of a message have been placed on said internal bus if it is not ready to receive a message, said stations having means for terminating the placement of words on said internal bus when a signal is asserted on said second control line, said arbitrator having means for asserting a signal on said second control line after any transmitter has placed a given maximum number of words on said bus, and said external data transfer means having means for conveying words on said internal bus to said output when no signals are asserted on said first and second control lines prior to the assertion of a signal on said second control line by said arbitrator.

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Ozluturk, Faith M.; Lomp, Gary R.; Kowalski, John, Apparatus for adaptive reverse power control for spread-spectrum communications.
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Ozluturk,Fatih M.; Lomp,Gary R.; Kowalski,John, Initial power control for spread-spectrum communications.
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Lomp,Gary R., Median weighted tracking for spread-spectrum communications.
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Ozluturk, Faith M.; Lomp, Gary R.; Kowalski, John, Method for adaptive reverse power control for spread-spectrum communications.
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Regis, Robert T., System and method for arbitration of a plurality of processing modules.
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Ozluturk,Fatih M.; Lomp,Gary R., System for using rapid acquisition spreading codes for spread-spectrum communications.
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Lomp, Gary; Ozluturk, Fatih; Silverberg, Avi, Transferring voice and non-voice data.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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Bus system 원문보기

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