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Flexible switching hub for a communication network

  • US 5,546,385 A
  • Filed: 01/19/1995
  • Issued: 08/13/1996
  • Est. Priority Date: 01/19/1995
  • Status: Expired due to Term
First Claim
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1. A communication subsystem comprising:

  • a central processing unit (CPU);

    a communication segment comprising;

    a switched hub circuit comprising a plurality of serial communication ports, each serial communication port comprising;

    a transmit first-in-first-out buffer (FIFO);

    a receive FIFO;

    a transmit direct memory access (DMA) circuit;

    a receive DMA circuit; and

    a communication control circuit;

    a dynamic random access memory (DRAM) subsystem, the DRAM subsystem comprising a plurality of virtual transmit FIFOs (VTFs), each VTF corresponding to a serial communication port of the plurality of serial communication ports, each VTF comprising a plurality of frame buffers; and

    a system interconnect bus coupling the switched hub circuit, the DRAM subsystem and the CPU.

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