®
MU9C8148
SRT Interface
MUSICI
S E M I C O N D U C T O R S
DATA SHEET DRAFT
DISTINCTIVE CHARACTERISTICS
• Supports High-speed Source Routing or Source Routing • Automatically selects Source Routed or Transparent
Transparent Bridging for up to eight ports
filtering routines based on Transceiver output data, and
supplies the proper Match, Fail, or Flush signals to the
MAC chips
• Glue-free operation with the MUSIC MU9C1480 LANCAM
and Texas Instruments’ Token Ring chip set
• Built-in arbitration allows two MU9C8148s to share a
central LANCAM database
• Configurable for either Motorola or Intel processor
addressing modes
• Selectable filtering options for each frame type
• Complies with the IEEE standards for 4 and 16 Mb/s
Token Ring
• Frame validity is checked on all Routing Information
Fields
• Contains a 128-entry Instruction Buffer that holds up to
seven down-loadable filtering and purging routines,
which can be automatically or directly invoked
• Manufactured in CMOS technology
• Available in 68-pin PLCC package and 80-pin TQFP
package
GENERAL DESCRIPTION
The MU9C8148 is a Source Routing Transparent (SRT) Interface for The MU9C8148 can choose to copy or reject a frame depending on the
the MUSIC Semiconductors MU9C1480 LANCAM for use in Token frame type (MAC, LLC, or reserved), and can perform multiple validity
Ring LAN Bridges and Brouters. This interface operates in accordance checks on the Routing Information Field (RIF), including general checks
with IEEE standards while supporting address filtering rates up to on every Routing Control Field (RCF), as well as multiple frame related
150,000 frames/sec for minimum-length frames.
checks.
The MU9C8148 has four interfaces to provide glue-free address The Instruction Buffer can be loaded with up to 128 instructions at
filtering. The Transceiver interface monitors receive data from the initialization for the LANCAM routines such as matching, learning,
Transceiver to the MAC, and determines whether to filter according to aging, purging, and data buffering operations. Internal arbitration
Source Routing or Transparent Bridging standards. The MAC interface controls access to the LANCAM. Separate arbitration pins allow two
supplies Match, Fail, and Flush signals to instruct the Token Ring MU9C8148s to easily form a dual-port Bridge by sharing a central
controller to reject or copy a frame. The LANCAM interface controls the LANCAM-based station list.
companion LANCAM(s) for Transparent filtering. The Host Processor
interface allows for direct initialization of the MU9C8148, and With seven Ring-Bridge-Ring number combinations stored internally,
downloading of the filtering and purging routines, to offload the the MU9C8148 can also operate as a source routing accelerator in
communication processor.
multi-port Token Ring Bridge/Brouter environments.
BLOCK DIAGRAM
/RDY
RXD
RXC
XMATCH
XFAIL, /FLUSH
MAC
INTERFACE
TRANSCEIVER
INTERFACE
/INT
5
A4-A0
16
DQ15-DQ0
TRANSPARENT
BRIDGING BLOCK
16
D15-D0
ALE, SRNW
/CS
SOURCE ROUTING
BLOCK
/E
/W
/RS, /LDS
/WS, /UDS
/HBRDY
/HBEN
INSTRUCTION
BUFFER
/CM
/EC
/MI
/FI
/HBDIR
/RESET
ARBITER
/FULL, /EMPTY
/RQ
/RQI
/INTEL
LANCAM, the MUSIC logo, and the phrase “MUSIC Semiconductors” are registered trademarks of MUSIC Semiconductors. MUSIC is a trademark
of MUSIC Semiconductors. This device takes advantage of features in the LANCAM patented under U.S. Patent 5,383,146.
15 April 1997 Rev. 5.5 Draft Web
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