Data transfer system and method of operation thereof

G - Physics – 06 – F

Patent

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354/232

G06F 13/38 (2006.01) G06F 13/364 (2006.01) G06F 13/42 (2006.01)

Patent

CA 1227878

DATA TRANSFER SYSTEM AND METHOD OF OPERATION THEREOF Abstract of the Disclosure A data transfer system with improved data trans- fer efficiency is provided. The system consists of a data interchange bus having two data transfer signal paths, an address signal path, and a plurality of control signal paths. Data interchange adapters and memory interchange adapters are coupled to the bus for transferring data thereover. A data interchange adapter transfers data on the first data signal path to another data interchange adpater or to a memory interchange adapter for storage in a memory device. A memory interchange adapter transfers data obtained from a memory device on the second data signal path to a data interchange adapter. Data transfers on the two data signal paths may be made simultaneously. Data transfers on both data signal paths are made synchro- nously. When an interchange adapter has data to be trans- ferred, it provides an access request signal to a data interchange bus controller which intermittently latches all outstanding access requests, examines them, and pro- duces a sequence of grant signals, each satisfying one of the latched request signals. When the sequence is com- pleted, the controller again latches the access requests which had been raised during the prior latching and granting procedure. The data interchange adapter is further provided with the capability of coupling to two other data buses while coupled to the data interchange bus and includes interface and control circuitry for routing signals between any two of the three buses.

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