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1.发明授权Asynchronous bidirectional interface with priority bus monitoring among contending controllers and echo from a terminator 失效异步双向接口，在竞争控制器之间进行优先级总线监控，并从终端器返回
公开(公告)号：US4209838A
公开(公告)日：1980-06-24
申请号：US752236
申请日：1976-12-20
IPC分类号： G06F13/374 , G06F13/42 , G06F9/18 , G06F3/04
CPC分类号： G06F13/374 , G06F13/4213
摘要： An interface which connects input/output (I/O) controllers to a data channel in a data processing system. A bidirectional priority bus is provided interconnecting the channel with the controllers. Each controller is assigned a priority level. When a controller requires service, it signals the channel over a common request line and the channel responds with a channel select signal. Each requesting controller gates a binary number corresponding to its priority level onto the common priority bus. Contending controllers resolve priority among themselves by monitoring the priority bus. If a controller detects a higher priority level than its own level on the bus it removes its priority number from the bus. The highest priority controller then activates an acknowledge signal and places its device address on a bidirectional data bus in response to a ready signal from the channel.
摘要翻译： 将输入/输出（I / O）控制器连接到数据处理系统中数据通道的接口。 提供了将通道与控制器互连的双向优先级总线。 每个控制器都被分配一个优先级。 当控制器需要服务时，它通过公共请求线来发送信道，并且信道用信道选择信号进行响应。 每个请求控制器将对应于其优先级的二进制数门控在公共优先级总线上。 竞争控制器通过监控优先级总线来自己解决优先级。 如果控制器在总线上检测到比其自身级别更高的优先级，则从总线上删除其优先级号。 最高优先权控制器然后激活确认信号，并将其设备地址置于双向数据总线上，以响应来自通道的就绪信号。
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