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1. 发明授权

US4768145A Bus system 失效
标题翻译：总线系统
公开(公告)号：US4768145A
公开(公告)日：1988-08-30
申请号：US675800
申请日：1984-11-28
申请人： Lynn M. Wheelwright , William B. Harmon , James W. Coffron
发明人： Lynn M. Wheelwright , William B. Harmon , James W. Coffron
IPC分类号： G06F13/20 , G06F13/42
CPC分类号： G06F13/4213
摘要： 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.
摘要翻译：公开了一种总线系统，其中具有向并行总线发送请求访问的消息的站和响应于请求的仲裁器将站的发射机依次连接到总线。在总线上放置的消息的单词分别表示要发送消息的站的地址，发送站的地址和数据。响应于其地址在总线上，站在一个控制线上断言信号，并且如果不能接收到消息则在另一个控制线上断言一个信号。整个消息是否由发送站放置在总线上，并且被加载到接收站的寄存器中取决于它们的信号是否被断言。外部数据传输装置将信号放在外部总线上的另一个并行总线上的站。外部总线是循环的形式，使得消息最终返回到发送它的站。当它们返回到发送消息的站时，这些位的逻辑电平指示发送消息的站是否存在，并且如果是，消息是否传递。

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