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參數(shù)資料
| 型號(hào)： | MVTX2803AG |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | Unmanaged 8-Port 1000 Mbps Ethernet Switch |
| 中文描述： | DATACOM, LAN SWITCHING CIRCUIT, PBGA596 |
| 封裝： | 40 X 40 MM, 2.33 MM HEIGHT, MS-034, HSBGA-596 |
| 文件頁(yè)數(shù)： | 17/127頁(yè) |
| 文件大小： | 1706K |
| 代理商： | MVTX2803AG |
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MVTX2803
Data Sheet
17
Zarlink Semiconductor Inc.
5.0 Search Engine
5.1 Search Engine Overview
The MVTX2803AG search engine is optimized for high throughput searching, with enhanced features to
support:
Up to 64K MAC addresses
4 groups of port trunking
Traffic classification into 8 transmission priorities, and 2 drop precedence levels
5.2 Basic Flow
Shortly after a frame enters the MVTX2803AG and is written to the Frame Data Buffer (FDB), the frame engine
generates a Switch Request, which is sent to the search engine. The switch request consists of the first 64
bytes of the frame, which contain all the necessary information for the search engine to perform its task. When
the search engine is done, it writes to the Switch Response Queue, and the frame engine uses the information
provided in that queue for scheduling and forwarding.
In performing its task, the search engine extracts and compresses the useful information from the 64-byte
switch request. Among the information extracted are the source and destination MAC addresses, the
transmission and discard priorities and whether the frame is unicast or multicast. Requests are sent to the
external SRAM Switch Database to locate the associated entries in the external MCT table.
When all the information has been collected from external SRAM, the search engine has to compare the MAC
address on the current entry with the MAC address for which it is searching. If it is not a match, the process is
repeated on the internal MCT Table. All MCT entries, other than the first of each linked list, are maintained
internal to the chip. If the desired MAC address is still not found, then the result is either learning (source MAC
address unknown) or flooding (destination MAC address unknown).
If the destination MAC address belongs to a port trunk, then the trunk number is retrieved instead of the port
number. But on which port of the trunk will the frame be transmitted This is easily computed using a hash of
the source and destination MAC addresses.
When all the information is compiled, the switch response is generated, as stated earlier.
5.3 Search, Learning, and Aging
5.3.1 MAC Search
The search block performs source MAC address and destination MAC address searching. As indicated earlier,
if a match is not found, then the next entry in the linked list must be examined, and so on until a match is found
or the end of the list is reached.
In port based VLAN mode, a bitmap is used to determine whether the frame should be forwarded to the
outgoing port. The bitmap is not dynamic. Ports cannot enter and exit groups dynamically.
The MAC search block is also responsible for updating the source MAC address timestamp, used for aging.
5.3.2 Learning
The learning module learns new MAC addresses and performs port change operations on the MCT database.
The goal of learning is to update this database as the networking environment changes over time. Learning and
port change will be performed based on memory slot availability only.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MVTX2803AG2 | 制造商:Microsemi Corporation 功能描述: |
| MVTX2804 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:8-Port 1000 Mbps Ethernet Distributed Switch |
| MVTX2804AG | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:8-Port 1000 Mbps Ethernet Distributed Switch |
| MVTX2804AG2 | 制造商:Microsemi Corporation 功能描述: |
| MVU10-10FBK | 功能描述:端子 D-10-1103K BS-33-10-P 85299 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點(diǎn)電鍍:Tin over Nickel 觸點(diǎn)材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp |
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