Preliminary Data Sheet

MU9C8328 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.

11 February 1999 Rev. 4a

Block Diagram

APPLICATION BENEFITS

filtering, and learning state machine at wire

speed

Motorola, or similar Ethernet Controllers

having an NRZ serial data port

on DA and SA compares

for long station lists

initialization and housekeeping activities

33 MHz

GENERAL DESCRIPTION

The MU9C8328 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 MU9C8328 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 MU9C8328 provides the proper sequencing

and timing of LANCAM accesses for an external

processor.

The MU9C8328 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

SERD AT

SERC L K

/R EJ E CT

SYSC LK

/R ESET

/C S

/AS

/W E

A(2-0)

D(15-0)

RE ADY

/I NT

3

LA NC AM IN TE R FA CE

NE TW O R K

IN T E RFACE

CO NT RO L

S TAT US

OP -C OD E

STA TE

MA CH IN E

PRO CE S S O R

IN T E RFACE

/N E T RD Y

AS S O C IAT ED D ATA