Preliminary Data Sheet

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

a trademark of MUSIC Semiconductors. Certain features of this device are patented under US Patent 5,383,146.

2 December 1998 Rev. 2

Block Diagram

DISTINCTIVE CHARACTERISTICS

Ø 4096 (4485A/L), 2048 (2485A/L), and 1024

(1485A/L) word CMOS content-addressable

memories (CAMs)

Ø 64-bit word width

Ø 32-bit I/O compatible with the MU9C1485

Ø Fast 50 ns compare speed

Ø Dual configuration register set for rapid

context switching

Ø Increased flexibility of MUSIC’s patented

CAM/RAM partitioning

Ø 80-pin TQFP package with the same pinout as

the MU9C1485 and MU9C1965A/L

Ø 5 volt (A) or 3.3 volt (L) operation

APPLICATION BENEFITS

Enhances Ethernet and Token-Ring LAN bridges

and switches:

Ø 64-bit width stores 48-bit MAC address plus

associated data (Port ID, time stamp,

“permanent” flag)

Ø 32-bit I/O supports multiple ports of fast

(100 Mb) Ethernet or Gigabit Ethernet

Ø Station list depth flexibility with choice of

pin-compatible device densities and

glue-free cascading

Ø 3.3 Volt option for low power systems

Ø Industrial temperature grades for harsh

environments

/W

/E

/CM

/E C

DQ 31– 0

(3 2 )

D ATA (64)

CO NT RO L

LO G I C

CAM A RR AY

32 K or 16 K

WO RD S

X 64 B ITS

CO M P ARAND

M ASK R E G IS TER 1

M ASK R E G IS TER 2

FLA G

LO G IC

/FF

/FI

/M F

/M I

CO MM ANDS

& S TATUS

2

15 / 1 4

CO NT RO L

AND S T AT US

RE G IS T ER S

17 / 1 6

(3 2 )

MUX

DE M U X

(3 2 )

SO U R CE AN D

D E S TINA TIO N

SE G M E N T

CO UNTE R S

D ATA (64)

(3 2 )

/R ESE T

/M M

/M A

TRA N S L A TE

(8 02 .3 /8 0 2 .5 )