GENERAL DESCRIPTION

The MU9C8248 is a Source Routing Transparent (SRT) Interface to the MUSIC Semiconductors LANCAM for use in FDDI LAN Bridges and Brouters. This interface operates in accordance with ISO standards while supporting address filtering rates up to 500,000 frames/sec for minimum-length frames.

DISTINCTIVE CHARACTERISTICS

? High-speed FDDI Source Routing and Transparent

Bridging address filter supports up to sixteen ports

? Glue-free operation with the MUSIC MU9C1480 LANCAM

and AMD, National Semiconductor, and Motorola FDDI

chip sets

? Configurable for both Motorola and Intel processor

addressing modes

? Complies with the ISO 9314 standard for FDDI

? 64-entry Instruction Buffer holds up to six downloadable filtering and purging routines

? 64-entry Data Buffer or internal FIFO

? Automatic selection of Source Routing or Transparent

filtering routines based on Transceiver output data

? Supplies proper XDAMAT, XSAMAT, SRMAT, ABORT,

and CIP signals to the FDDI chip sets

? Selectable filtering options for each frame type

? Checks validity of Routing Information Field

? TTL-compatible interfaces

? Manufactured in CMOS technology

? Available in 100-pin PQFP package