专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US4754399A Data transfer control system for controlling data transfer between a buffer memory and input/output devices 失效
标题翻译：数据传输控制系统，用于控制缓冲存储器和输入/输出设备之间的数据传输
公开(公告)号：US4754399A
公开(公告)日：1988-06-28
申请号：US687163
申请日：1984-12-28
申请人： Akira Yamamoto , Toru Nishigaki , Miho Nonomura , Takashi Doi
发明人： Akira Yamamoto , Toru Nishigaki , Miho Nonomura , Takashi Doi
IPC分类号： G06F13/12 , G06F13/00 , G11C7/00
CPC分类号： G06F13/122
摘要： An input/output control system has a control unit including a first controller connected between a channel and a data buffer for controlling the transfer of data therebetween and a second controller connected between the data buffer and a plurality of input/output devices for controlling the transfer of data therebetween. A start action of the input/output device is effected in an off-line mode from the control unit. The amount of data stored in the data buffer is checked each time the transfer of data occurs between the channel and the data buffer. In the case of a read processing, when the amount of data stored in the data buffer becomes less than a first predetermined value, data is transferred for preload from the input/output devices to the data buffer. In the case of a write processing, when the amount of data stored in the data buffer exceeds a second predetermined value, data is transferred for after-write from the data buffer to the input/output devices. Each of the first and second predetermined values is determined depending on the amount of input/output devices which are in an active state at that time. When each of the active input/output devices is allocated with m (.gtoreq.2) unit fields of the data buffer each of which has a capacity of K/(mn) where K is the whole capacity of the data buffer and n is the number of the active input/output devices, the first and second predetermined values may be K/(mn) respectively.
摘要翻译：输入/输出控制系统具有控制单元，该控制单元包括连接在通道和数据缓冲器之间的第一控制器，用于控制其间的数据传送，以及连接在数据缓冲器和多个输入/输出设备之间用于控制传送的第二控制器的数据。输入/输出设备的启动动作在离线模式下从控制单元进行。每当在通道和数据缓冲器之间发生数据传输时，检查存储在数据缓冲器中的数据量。在读取处理的情况下，当存储在数据缓冲器中的数据量变得小于第一预定值时，将数据从输入/输出装置传送到数据缓冲器。在写入处理的情况下，当存储在数据缓冲器中的数据量超过第二预定值时，将数据从数据缓冲器传送到输入/输出装置。第一和第二预定值中的每一个取决于当时处于活动状态的输入/输出装置的量。当每个有源输入/输出装置分配数据缓冲器的m（> / = 2）个单位字段时，每个单元字段具有K /（mn）的容量，其中K是数据缓冲器的整个容量，n是有源输入/输出设备的数量，第一和第二预定值可分别为K /（mn）。

IPRDB

热门服务

关于我们

友情链接

联系方式