公开(公告)号：CA1156767A

公开(公告)日：1983-11-08

申请号：CA364528

申请日：1980-11-12

Applicant: IBM

Inventor： BURK JOHN L ,  CORMIER ROGER L ,  HARTUNG MICHAEL H ,  LARNER RAY A ,  LUCAS DONALD J ,  LYNCH KENNETH R ,  MOORE BRIAN B ,  PAGE HOWARD L ,  WANSOR DAVID H ,  ZEITLER CARL JR

IPC: G06F13/00 ,  G06F13/12 ,  G06F15/167 ,  G06F9/00 ,  G06F15/00

Abstract: Secondary storage subsystems exchange messages and data with host data processing systems and also forward messages between host systems. Host systems thereby communicate with each other in addition to having access to data in subsystem storage. Access to subsystem storage is initiated by a "request" sent from a host to the subsystem. Each request is a message containing an array of one or more commands, each command specifying a transfer of data or a control function to be performed by the subsystem. A subsystem may process more than one request at a time. It also may process the commands in a request in an arbitrary sequence suited to the availability of subsystem resources and data links to host systems. After all commands in a request have been processed the subsystem transmits an associated "completion" message to the host system which originated the request. The completion message indicates the status of completion or abnormal termination of each command in the associated request. An "adapter" processor associated with each host and subsystem operates on an asynchronous basis to transfer messages and data relative to the associated host or subsystem. One or more processing "engines" in each adapter communicates with one or more CPU's in the associated host or subsystem through an associated "adapter store". A portion of each adapter store is used as a buffer pool for constructing "subchannel control spaces" to control transfers of messages and data. Elements of each subchannel control space are returned to free status as soon as they are not needed for sustaining associated transfers. PO9-78-012

公开(公告)号：CA1009372A

公开(公告)日：1977-04-26

申请号：CA185034

申请日：1973-11-05

Applicant: IBM

Inventor： BROADHURST DENNIS ,  MOORE BRIAN B

IPC: G06F13/00 ,  G06F13/38 ,  G06F13/42

Abstract: 1441129 Selective signalling INTERNATIONAL BUSINESS MACHINES CORP 26 Nov 1973 [29 Dec 1972] 54762/73 Heading G4H [Also in Division H4] In a multiple-unit communication system, each of a plurality of the units is capable of receiving data and includes a frame generator and a frame-monitor-and-data-extractor defining the start and finish of a distinct loop frame transmission path to which the remaining units have access only by way of frame processing means for inserting data into an extant frame whereby the network is receiver-driven. As disclosed, the units are the CPU and subsystems of a computer, and each unit can receive data from any of the others by way of a loop as above respective to the receiver. Transmission is serial by bit in each loop. The frame generator of a unit can generate "empty" frames up to the number of empty input buffers, and any of the other units can send information to this unit by converting one or more frames to "full" frames in their frame processing means. The frame processing means and the framemonitor-and-data-extractors synchronize on the beginnings of frames. "Idle" frames can also be sent merely to synchronize. "Full" frames are used to demand data transfer (involving reading from or writing into a store at the unit which receives the frame) or to demand control transfer, and the unit receiving either of these varieties of frame responds with an appropriate response "full" frame in the appropriate other loop. Each frame contains bits to specify its type, and the various varieties of "full" frame also contain the number of the originating unit, a demand-response correlation field, check information, and where appropriate storage protection key, data, address, byte-selecting bits, etc.

公开(公告)号：CA1006985A

公开(公告)日：1977-03-15

申请号：CA186125

申请日：1973-11-19

Applicant: IBM

Inventor： MOORE BRIAN B ,  THORN CARYL A

IPC: G06F13/00 ,  G06F13/20 ,  G06F13/38