公开(公告)号：US3706974A

公开(公告)日：1972-12-19

申请号：US3706974D

申请日：1971-10-27

Applicant: IBM

Inventor： PATRICK ROBERT L ,  RICKARD PATRICK L

IPC: H04L29/04 ,  G06F13/00 ,  G06F13/34 ,  G06F9/18

CPC classification number: G06F13/34

Abstract: A plurality of devices any one of which can request service by a central controlling unit are interconnected in a loop arrangement by an enabling line. The controlling unit is effectively coupled in parallel to all the devices so that the presence of a service request by one of them will immediately initiate operations that will result in one of the devices being granted service. Each device includes logic circuitry to force it to actuate its leg of the enabling line loop if it was the device granted last service or if it does not have a service request present. The connection of the device to the controlling unit results only if it has a service request and receives an enabling line signal from the device preceding it on the loop. Means for bypassing device requests to read high priority requests can be included as can means to initiate data gating overlapping with the establishing of the servicing connection.

Abstract translation: 其中任何一个可以由中央控制单元请求服务的多个设备通过启用线路以环路布置互连。 控制单元与所有设备并行地有效地耦合，使得其中一个设备的服务请求的存在将立即启动将导致其中一个设备被授予服务的操作。 每个设备包括逻辑电路，如果是设备授予最后一个服务或者不存在服务请求，则强制其启动其启用线路回路的支路。 仅当设备具有服务请求并且从循环上的设备接收到使能线路信号时，设备与控制单元的连接才会产生。 可以包括用于绕过设备请求以读取高优先级请求的装置，可以意味着启动数据门控与建立服务连接重叠。

公开(公告)号：CA1000378A

公开(公告)日：1976-11-23

申请号：CA154871

申请日：1972-10-26

Applicant: IBM

Inventor： PATRICK ROBERT L ,  RICKARD PATRICK L

IPC: H04L69/14 ,  G06F13/00 ,  G06F13/34

Abstract: A plurality of devices any one of which can request service by a central controlling unit are interconnected in a loop arrangement by an enabling line. The controlling unit is effectively coupled in parallel to all the devices so that the presence of a service request by one of them will immediately initiate operations that will result in one of the devices being granted service. Each device includes logic circuitry to force it to actuate its leg of the enabling line loop if it was the device granted last service or if it does not have a service request present. The connection of the device to the controlling unit results only if it has a service request and receives an enabling line signal from the device preceding it on the loop. Means for bypassing device requests to read high priority requests can be included as can means to initiate data gating overlapping with the establishing of the servicing connection.