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DP83957 Datasheet

  • DP83957

  • 24頁

  • ETC

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DP83957 10 Mb s Repeater Information Base
PRELIMINARY
June 1995
DP83957 10 Mb s Repeater Information Base
General Description
The DP83957 Repeater Information Base 鈥樷€楻IB鈥欌€?allows ef-
fective implementation of managed multi-port 10 Mb s
ethernet repeater hubs The device supports all the neces-
sary Port Attributes for the IEEE 802 3k standard (Layer
Management for 10 Mb s Baseband Repeaters) This de-
vice is designed to be interfaced with Repeater Interface
Controllers (DP83950 2) and gathers attributes on a per-
port per-packet basis
The DP83957 collects management attributes via the
DP83950 2 Management Bus and stores this information in
an external SRAM The DP83957 can be programmed to
collect information for up to two DP83950 2 on a shared
Management Bus It can also be used in a dedicated one
DP83957 per DP83950 2 architecture The attributes stored
in external SRAM can be easily accessed through the
DP83957 by an 8-bit multiplexed Address Data bus
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Fully IEEE 802 3K-July 1992 compatible
Supports up to two DP83950 2
Supports generic 1k x 8 or 2k x 8 SRAMs with variable
access times of up to 45 ns
Guarantees at least one attribute access by the micro-
processor in the busiest network scenario
Pipelined architecture for processing back to back
frames
Supports maskable interrupts for status and error re-
porting on a shared interrupt pin
Detection and notification of DP83950 Management
Bus errors
Detection and notification of overflow of attribute coun-
ters
80-pin PQFP package
1 0 System Diagram
TL F 12437 鈥?1
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 12437
RRD-B30M105 Printed in U S A

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