专利名称：Digital communications controller with
firmware control
发明人：David P. Misunas,Peter G. Jessel,Robert G.
Jacobsen
申请号：US05/761126申请日：19770121公开号：US04174536A公开日：19791113
摘要：A microprocessor-based system serves as a message routing switch for
communication between a number of different devices. Any device attached to the switchcan communicate with any other attached device through a number of serial and parallelInput/Output ports. Communication between devices attached to the switch is in one oftwo formats. In a first method of communication, an attached device can be directlyassociated with another attached device in which case any communication from one isimmediately transmitted to the other. In a second method of communication, an attacheddevice communicates with the switch by means of fixed format packets, each of whichcontains a specification of its destination and error checking capabilities. This secondmethod of communication permits examination of the validity of messages transmittedto or from the switch and enables message retransmission in the case of error.
申请人：MASSACHUSETTS INSTITUTE OF TECHNOLOGY
代理人：Arthur A. Smith, Jr.,Gerald Altman
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