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PDF ( 数据手册 , 数据表 ) T71L6808A

零件编号 T71L6808A
描述 Octal 10/100 Switch with Embedded Memory
制造商 Taiwan Memory Technology
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T71L6808A 数据手册, 描述, 功能
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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
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to change products or specifications without notice.
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Publication Date:May. 2001
Revision:0.A







T71L6808A pdf, 数据表
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Preliminary T71L6808A
packets (include broadcast DA and DA search missed packet) will be forwarded to those ports
belong to the same VLAN group. When VLAN is programmed to 1, port 0-3 and port 4-7 are
belong to two different VLAN groups. Two VLAN groups are not overlapped, thus one
T71L6808A can support two 4 ports switch function whenever VLAN is programmed high.
Port Trunking
Trunking allows two ports to be connected in parallel between two switches to increase the
interconnection bandwidth. The trunking algorithm determines on which of these ports a frame is
transmitted so that the load is spread across these ports. However, while traffic should be shared
between trunking ports as evenly as possible. The T71L6808A supports port 0 and port 1 to be one
trunk group. Hense, the maximum aggregated bandwidth for trunking group is 400Mbps. (or
200Mbps, bi-directional)
et4U.com
Port Monitoring
The T71L6808A supports port monitoring. This feature provides complete network monitoring
capability at 100 Mbit/s. A copy ingress (RX) data of the monitored port is sent to their respective
snooping ports. The monitored port is selected by MPID. The T71L6808A allows receive data to be
monitored by different snooping ports. ThDeastanSoohpeient4gUp.ocrotms are also selected by SPID.
Priority
In Multimedia application, the audio & voice message is time critical to users. Normally it might
have discontinue phenomenon through the Ethernet network, especially if the network segment
utilization more than 30%, the message can not reach users in time.
The T71L6808A supports port priority per port basis QoS. Continuous priority traffic to
a destination port will take precedence against normal continuous traffic to the same destination
port. Packets from priority ports will arrive at the destination port earlier than packets arrived from
normal ports. Priority rules apply for ports in any speed mode and duplex mode.
T71L6808A has 2 queues for each port: One for regular traffic, another for priority traffic. The
packets coming from the port(s) with priority setup (QoS) will go to the priority queue of the
destination port.
Serial Management Interface MDC/MDIO
The T71L6808A supports PHY management through the serial MDIO and MDC signal lines. After
power on reset, the T71L6808A write abilities to the advertisement register 4 of connected PHY and
DataSheet4U.comTaiwan Memory Technology, Inc. reserves the right P. 8
to change products or specifications without notice.
Publication Date:May. 2001
Revision:0.A
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T71L6808A equivalent, schematic
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Preliminary T71L6808A
et4U.com
Serial EEPROM 24LC02 Format
Below is the content of serial EEPROM 24LC02. The content includes configuration and CRC for
flow control.
Bit 7
6 54 3 2
Byte
0 BRDCTRL 0 0 0 0 0
1
0 HashMode 0
0
0
0
2-7 Pause Frame Source Address PSA[47:0]
8-11 Pause ON CRC[31:0]
12-15
Pause OFF CRC[31:0]
16 Port Priority PR[7:0]
17 0 0 0 0 TrunkEn 0
18 0 SnoopEn
MPID[2:0]
10
00
00
AgeEn VLAN
SPID[2:0]
BRDCTRL:
HashMode:
When 0, the broadcast storm control function is disabled.
When 1, the broadcast storm control function is enabled.
When 1, address hashing algorithm used for search and learning.
When 0, address direct mapping algorithm used.
PR[7:0]:
TrunkEn:
AgeEn:
VLAN:
SnoopEn:
MPID[2:0]:
SPID[2:0]:
When 1, high priorityDfaotracSohrereest4pUon.cdoimng transmission port.
When 0, low priority for corresponding transmission port.
When 0, port trunking disable.
When 1, port trunking enable, assign port 0 and port 1 to the trunking group.
When 0, the table aging process will be stopped.
When 1, the table aging process will be running to age every learned table entry.
Default value is 1 ( i.e. age enable)
When 0, all 8 ports are in the same VLAN.
When 1, two groups VLAN 0-3 and 4-7.
When 0, snooping disable.
When 1, snooping enable.
Monitored Port ID.
Snooping Port ID for incoming frame flow.
Note : All 0-fields must be filled with 0.
DataShee
DataSheet4U.comTaiwan Memory Technology, Inc. reserves the right P. 16
to change products or specifications without notice.
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Publication Date:May. 2001
Revision:0.A










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