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T71L6808A Schematic ( PDF Datasheet ) - Taiwan Memory Technology

Teilenummer T71L6808A
Beschreibung Octal 10/100 Switch with Embedded Memory
Hersteller Taiwan Memory Technology
Logo Taiwan Memory Technology Logo 




Gesamt 23 Seiten
T71L6808A Datasheet, Funktion
www.DataSheet4U.com
tm TE
CH
Preliminary T71L6808A
Octal 10/100 Switch
with Embedded Memory
The T71L6808A is an octal-port 10/100Mbps dual speed Ethernet switch integrated both with an
embedded SSRAM and a 1K entries of address table. A high performance Fast Ethernet switch,
fully complies with the IEEE802.3, 802.3u and 802.3x specifications, can be implemented using the
T71L6808A with physical devices. The T71L6808A is intended for applications to stand-alone
switch for low-cost SOHO market.
Features
Supports eight 10/100Mbps Ethernet ports with RMII interface
Fully non-blocking shared memory architecture using page-based embedded SSRAM.
Incorporating with the output private buffering scheme to prevent HOL (head of line) blocking
Wire-speed store-and-forward switching with low switching latency. Automatic address
learning, local frames filtering, and adjustable aging
Embedded 1K entries of look-up table
Supports full and half duplex operatiDoantsaSheet4U.com
Link, speed and duplex status are auto-detected via MDIO
Auto-negotiated Full-duplex flow control by writing the ability via MDIO to external PHY
Supports IEEE 802.3x flow control for full-duplex operation
Supports back-pressure flow control for half-duplex operation
Serial EEPROM interface for auto-configuration
Broadcast storm control
Port trunking & load sharing
Port-based VLAN
Port monitoring(snooping or mirroring)
Supports port priority per port basis QoS
Only one 50MHz OSC
128-pin PQFP, 3.3V CMOS technology
DataShee
DataSheet4U.comTaiwan Memory Technology, Inc. reserves the right P. 1
to change products or specifications without notice.
DataSheet4 U .com
Publication Date:May. 2001
Revision:0.A






T71L6808A Datasheet, Funktion
www.DataSheet4U.com
tm TE
CH
Preliminary T71L6808A
If the destination address is not found in the address table, the T71L6808A treats the packet as a
broadcast packet and forwards the packet to the other ports.
If the port monitoring function is enabled, the packet forwarding decision is also subject to the port
monitoring configurations.
If the first bit of the destination address is a “1,” the packet will be handled as a multicast or
broadcast frame. The destination ports of the broadcast packet are all ports within the same VLAN
except the source port itself.
The T71L6808A automatically learns the port number of attached network devices by examining
the source MAC address of all incoming packets. If the source address is not found in the address
table, the switch IC adds it to the table.
et4U.com
Address Learning
TheT71L6808A provides an on-chip 1K MAC Address-to-PortID table for the frame destination
look-up operations. It uses a hashing algorithm to learn the MAC address. The T71L6808A
s e a DrataSheet4U.cocm h e s
for the source address (SA) of an incoming packet in the address table and acts as follows : If the
SA was not found in the address table(a new address), the T71L6808A waits until the end of the
packet (no-error packet) and updates the address table. If the SA was found in the address table,
then aging value of each corresponding entry will be reset to 0.
The Individual MAC Address is a 48-bit unique MAC address to be programmed or learned. Bit 0
of a SA will be masked, i.e. no multicast SA.
When the DA is PAUSE command, then the learning process will be disabled automatically by
T71L6808A.
Address Aging
If the SA aging option is enabled, the learned SA will be cleared if it is not refreshed within the 300
seconds.
Broadcast Storm Control
The T71L6808A supports broadcast storm control on a per-port basis. Broadcast packets will be
forwarded to all ports except the source port and thus will use too much of the switch resources
DataSheet4U.comTaiwan Memory Technology, Inc. reserves the right P. 6
to change products or specifications without notice.
Publication Date:May. 2001
Revision:0.A
DataSheet4 U .com
DataShee

6 Page









T71L6808A pdf, datenblatt
www.DataSheet4U.com
tm TE
CH
Pin Assignment
Preliminary T71L6808A
et4U.com
DataSheet4U.com
DataShee
DataSheet4U.comTaiwan Memory Technology, Inc. reserves the right P. 12
to change products or specifications without notice.
DataSheet4 U .com
Publication Date:May. 2001
Revision:0.A

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