Multiplex communications – Wide area network – Packet switching
Patent
1991-02-15
1992-12-29
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 60, H04L 1256
Patent
active
051757320
ABSTRACT:
Method and apparatus are provided for data communication control within the communication controllers of stations within a local area network. In general, the method and apparatus involves maintaining within the command and status control interface unit of the communication controller, receive and transmit command queues as well as receive and transmit status queues. Pluralities of receive and transmit data packet storage locations are provided for storing data packets to be received as well as transmitted. Each receive command is uniquely associated with a data packet storage location. Receive and transmit commands are buffered in a pipeline manner in the receive and transmit command queues, respectively, whereas receive and transmit status bits are buffered in a pipeline manner in the receive and transmit status queues, respectively. The processor interfacing with the communication controller buffers transmit and receive commands in their respective queues and allocates corresponding data packet storage locations for these commands. The media access control unit of the communication controller executes each command when it is ready according to network protocol, and generates status bits which are buffered in respective status bit queues. The status bits are selectively processed to generate interrupts to the host processor, which can be serviced in due course. As a result of the present invention, consecutive transmission and reception of data packets can be achieved in a manner independent of the operation of the host processor. Consequently, the minimum back-to-back separation between two communication events of the same type, is eliminated thereby improving node and network data throughout.
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Hendel Ariel
Virzi John D.
Olms Douglas W.
Samuel T.
Standard Microsystems Corp.
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