Runt packet filter

Details Runt packet filter Runt packet filter

H - Electricity

04

L

354/232, 340/71

H04L 12/24 (2006.01) H04L 12/16 (2006.01) H04L 12/28 (2006.01) H04L 12/413 (2006.01)

Patent

CA 1278873

Abstract Provided is a circuit for preventing local area network packets shorter than a predetermined bit length from being received by a local area network coprocessor. Serial data which would otherwise be received by the coprocessor is delayed by a data-shift register of predetermined bit length. Simultaneously, a carrier-sense-signal, which alerts the coprocessor that serial data is ready to be received, is modified by a carrier-sense- signal regeneration circuit. If the carrier-sense-signal is detected true by the regeneration circuit for a number of clock cycles equal to the number of bits in the data-shift register, then the carrier-sense-signal is delivered to the coprocessor and the data in the data-shift register is received by the coprocessor. Once the carrier-sense-signal goes false, the regeneration circuit continues to deliver the carrier-sense- signal until the data-shift register empties.

522917

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