ACD80800 Datasheet, PDF (3/19 Pages) List of Unclassifed Manufacturers – Address Resolution Logic (8K MAC Addresses)

1. SUMMARY
2. FEATURES
The ACD80800 serves as an Address Resolution Logic • Supports up to 8K MAC address lookup
for ACD’s switch controller chips (ACD82124, • Provides Glueless ARL Interface with ACD’s
ACD82012 etc.) through a glueless ARL interface. It
switch controller chip
automatically builds up an address table and can map • Provides Direct Input/Output type of interface for
up to 8K MAC addresses into their associated ports.
the management CPU
• Provides UART type of interface for the manage-
The ACD80800 can work without a CPU in a unmanaged
ment CPU
switch system, or with a CPU and an ACD MIB • Wire speed address lookup time.
(ACD80900 Management Information Base). A direct • Wire speed address learning time.
input/output interface is integrated to support a man- • Address can be automatically learned from switch
agement CPU. The CPU can configure the operation
without THE CPU intervention
mode of the ACD80800, learn all the addresses in the • Address can be manually added by the CPU
address table, add new addresses into the table, con-
through the CPU interface
trol security or filtering features of each address entry, • Each MAC address can be secured by the CPU
etc.
from being changed or aged out
• Each MAC address can be marked by the CPU
The ACD80800 is designed with such a high perfor-
from receiving any frame
mance that, it will never slow down the frame switching • Each newly learned MAC address is notified to
operation conducted by the ACD’s switch controllers.
the CPU
Together with the non-blocking architecture of the ACD’s • Each aged out MAC address is notified to the
switch controllers, the chip set (a ACD switch controller
CPU
plus the ACD80800, plus ACD80900 in a managed • Automatic address aging control, with
switch system) can provide wire speed forwarding rate
configurable aging period
under any type of traffic load.
• 0.35 micron, 3.3V CMOS technology
• 128-Pin PQFP package
Figure-1: ACD80800 Used in A Managed n-Port Fast Ethernet Switch System
P(n-1)
P(n-2)
P(n-3)
P1
P0
ACD82xxx
n-Port Fast Ethernet
Switch Controller
ASRAM
ACD80900
MIB
ACD80800
Address Resolution
Logic
CPU
3