04679193 is referenced by 11 patents and cites 2 patents.

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.

Title
Runt packet filter
Application Number
6/798204
Publication Number
4679193
Application Date
November 14, 1985
Publication Date
July 7, 1987
Inventor
Scott S Neal
Woodland Park
CO, US
Jerry D Morris
Colorado Springs
CO, US
Stephen P Reames
Colorado Springs
CO, US
Gordon A Jensen
Colorado Springs
CO, US
Agent
Jon R Stark
Christopher J Byrne
Assignee
Hewlett Packard Company
CA, US
IPC
H04B 3/36
H04J 3/06
H04J 3/24
View Original Source