Multiplex communications – Wide area network – Packet switching
Patent
1993-04-23
1995-12-05
Gregory, Bernarr E.
Multiplex communications
Wide area network
Packet switching
395891, 395821, 395872, 370 16, G06F 1300
Patent
active
H00015075
ABSTRACT:
A controller interface for demand assigned multiple access (DAMA) devices is provided. The controller interface includes a plurality of matched pairs of receive/transmit FIFO memory devices. The receive FIFOs, controlled by a clock signal output by the DAMA devices, accept serial format data and output parallel format data onto a first parallel data bus internal to the controller interface. The transmit FIFOs, controlled by an independent clock that generates clock pulses at a rate that is approximately equivalent to that of the clock signal used to control each of the receive FIFOs, accept parallel format data from a second parallel data bus internal to the controller interface and output serial format data for ultimate use by the DAMA devices. A first buffer receives parallel format data on the first internal parallel data bus and outputs same onto a parallel control data bus external to the controller interface. A second buffer receives parallel format data on the external parallel control data bus and outputs same onto the second internal parallel data bus. A third buffer stores status information from each of the receive and transmit FIFOs. An enable signal is issued based on the status information to a selected one of the receive and transmit FIFOs so that the selected receive FIFO outputs parallel data onto the first internal parallel data bus and the selected transmit FIFO outputs serial format data.
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Hendrickson Clark R.
Mattoon Thomas G.
Fendelman H.
Gregory Bernarr E.
Keough T. G.
Lipovsky P. A.
The United States of America as represented by the Secretary of
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