Ethernet media access controller with external address detection

Details Ethernet media access controller with external address detection Ethernet media access controller with external address detection

1992-02-24

1994-04-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 99, H04J 300

Patent

active

053053214

ABSTRACT:
A method is provided for use with an Ethernet Media Access Controller (MAC) and a look-up memory external to the MAC, the method determines whether to accept or to reject an Ethernet packet which is decoded by the MAC into a serial data (SRD) signal stream and a serial data clock (SRDCLK) signal, the method comprises the steps of: converting the SRD signal stream into byte frames and loading the frames into a receive FIFO of the MAC; while the receive FIFO is being loaded, producing by the MAC, a boundary delimiter (BD) signal stream which delimits the frame boundary of each byte frame; while the receive FIFO is being loaded, providing the SRD signal stream, the SRDCLK signal and the BD signal stream from the MAC to the look-up memory; while the receive FIFO is being loaded, determining whether a prescribed field in the packet matches information stored in the look-up memory; while the receive FIFO is being loaded, informing the MAC by the look-up memory whether a match has been detected.

REFERENCES:
patent: 4914652 (1990-04-01), Nguyen
patent: 4951280 (1990-08-01), McCool et al.
patent: 5031174 (1991-07-01), Natsume
patent: 5043981 (1991-08-01), Firoozmand et al.
patent: 5050165 (1991-09-01), Yoshioka
patent: 5136582 (1992-08-01), Firoozmand
Electronic Design, vol. 38, No. 8, Apr. 26, 1990, "Speed LAN-Address Filtering with CAMs".

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