Preliminary Data Sheet
MU9C8328 Ethernet Interface
APPLICATION BENEFITS
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
D Q (1 5 -0 )
Ø
Single port 10 MHz Ethernet address parsing,
filtering, and learning state machine at wire
speed
Ø
Glue-free interface between the MUSIC
LANCAM
®
Family and AMD, National,
Motorola, or similar Ethernet Controllers
having an NRZ serial data port
Ø
Selectable filtering and learning decisions
on DA and SA compares
Ø
Supports cascaded MUSIC LANCAM series
for long station lists
Ø
Host processor port for LANCAM
initialization and housekeeping activities
Ø
Supports system clock rates from 20 MHz to
33 MHz
Ø
100-pin PQFP package
Ø
5 Volt operation
/C M
LA NC AM IN TE R FA CE
/C S
/AS
S E RC L K
S E RD AT
/N E T RD Y
/R EJ E CT
NE TW O R K
IN T E RFA C E
S TA TE
M A CH IN E
3
/F F
/M F
/E C
/W
/E
/W E
A(2 -0 )
D(1 5 -0 )
RE A D Y
/I NT
CO NT RO L
S TAT US
O P -C O D E
AS S O C IAT ED D ATA
S Y S C LK
/R E S E T
P RO CE S S O R
IN T E RFA C E
Block Diagram
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
MUSIC [ MUSIC SEMICONDUCTORS ]
