Preliminary Data Sheet

MU9C8328A Ethernet Interface

MUSIC Semiconductors, the MUSIC logo, the phrase “MUSIC Semiconductors”, and LANCAM are registered trademarks of MUSIC

Semiconductors. All other trademarks are registered by their respective owners. MUSIC is a trademark of MUSIC Semiconductors.

24 June 1999 Rev. 0.8 Draft

Block Diagram

APPLICATION BENEFITS

filtering, and learning at wire speed

Family and AMD, National, Motorola, or similar

Ethernet Controllers having an NRZ serial data port

and SA compares

long station lists

housekeeping activities

33 MHz

GENERAL DESCRIPTION

The MU9C8328A speeds up bridging operations using

Ethernet controller chips with serial NRZ data outputs,

such as AMD’s MACE™, National’s SONIC™, and

Motorola’s QUICC™ controllers, by parsing the Ethernet

frame independently of the Ethernet controller device, and

notifying it whether to accept or reject the incoming frame.

The MU9C8328A supports both positive and negative

filtering on the Destination address and learning of new

Source addresses, by efficiently controlling the compare

activities of the MUSIC LANCAM Family. Filtering and

learning routines are user configurable. These routines

are automatically invoked by the internal state machine

based on the contents of the incoming frame and the

configuration settings. For aging and other housekeeping

routines, the MU9C8328A provides the

proper

sequencing and timing of LANCAM accesses for an

external processor.

The MU9C8328A receives serial NRZ data from the

Ethernet controller chip, finds the Start delimiter, and loads

the DA and SA into registers. The DA is sent to the

LANCAM for filtering and, depending on the filter action

SE R DAT

SE R CL K

/REJ E C T

SY S C L K

/RESE T

/CS

/AS

/WE

A(3-0)

D(15-0)

REA D Y

/IN T

4

LA N CA M INTER FAC E

NET W O R K

INT E R FA C E

CO N T ROL

STAT U S

O P -C ODE

STA TE

MA C HIN E

PRO CES S O R

IN T E R FA C E

/NE T R DY

ASS O C IAT E D DATA

Note: This document version has not completed MUSIC’s internal approval process, therefore it should be

rechecked with a released version or with factory personnel.