參數(shù)資料
型號: MDS212CG
廠商: ZARLINK SEMICONDUCTOR INC
元件分類: 網(wǎng)絡(luò)接口
英文描述: 12-Port 10/100Mbps Ethernet Switch
中文描述: DATACOM, LAN SWITCHING CIRCUIT, PBGA456
封裝: 35 X 35 MM, 2.33 MM HEIGHT, MS-034, HSBGA-456
文件頁數(shù): 31/111頁
文件大小: 1609K
代理商: MDS212CG
MDS212
Data Sheet
31
Zarlink Semiconductor Inc.
6.0 Search Engine
The Search Engine is responsible for determining the destination information for all packet traffic that enters the
MDS212. The results from all address or VLAN searches are passed to the Frame Engine to be forwarded, or on to
the HISC block for further processing. Either way, the result messages provide all the needed information to allow
the destination block to process the packet.
The Search Engine has been optimized for high throughput searching, utilizing the integrated Switch Database
Memory (SDM). The internal SDM contains up to 2k MAC Control Table (MCT) entries. These MCT entries are
searched utilizing one of four Hashing algorithms that can be selected. This provides the capability of changing the
search hashing to optimize the hash tables based on the traffic patterns in a given network. For example, if a
company gets all their Network Interface Cards (NIC) from one vendor, then the source and destination MAC
addresses will have common fields. This can lead to inefficient search hashing. With 4 different hash selections that
utilize different parts of the address fields, and can be 8, 9, or 10 bits in length, the hashing algorithm that works
best for a user’s network can be selected (by testing each hash algorithm).
Figure 6 - Typical Packet Header Information
Layer 1
Preamble
SFD
Data
EFD
Packet
Destination MAC Address
Destination MAC Address
Source MAC Address
Source MAC Address
VLAN Tag
0x800
Ver
IHL
Typ of Serv
Total Length
Identifier
Flg
Fragment Offset
Time to Live
Protocol
Header Checksum
IP Source Address
IP Destination Address
Options + Padding
Source Port #
Destination Port #
Sequence Number
Acknowledgement Number
Checksum
Urgent Pointer
Options + Padding
Data
Offset
Reserved
UAPRSF
Window
Layer 2
Layer 3
Layer 4
ENET 2
Header
IP
64
Bytes
TCP/IP
Header
Header
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