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參數(shù)資料
| 型號(hào)： | MVTX2804AG |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | 8-Port 1000 Mbps Ethernet Distributed 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)： | 26/174頁(yè) |
| 文件大?。?/td> | 2249K |
| 代理商： | MVTX2804AG |
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MVTX2804
Data Sheet
26
Zarlink Semiconductor Inc.
indicate all the ports to which the frame will be forwarded. Moreover, if port trunking is enabled, this block
selects the destination port (among those in the trunk group).
In port based VLAN mode, a bitmap is used to determine whether the frame should be forwarded to the
outgoing port. The main difference in this mode is that the bitmap is not dynamic. Ports cannot enter and exit
groups because of real-time learning made by a CPU.
The MAC search block is also responsible for updating the source MAC address timestamp and the VLAN port
association 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. When CPU
reporting is enabled, learning and port change will be performed when the CPU request queue has room, and a
memory slot is available, and a “Learn MAC Address” message is sent to the CPU. When CPU reporting is
disabled, learning and port change will be performed based on memory slot availability only.
In tag based VLAN mode, if the source port is not a member of a classified VLAN, a “New VLAN Port” message
is sent to the CPU. The CPU can decide whether or not the source port can be added to the VLAN.
5.3.3 Aging
Aging time is controlled by register 400h and 401h.
The aging module scans and ages MCT entries based on a programmable “age out” time interval. As we
indicated earlier, the search module updates the source MAC address and VLAN port association timestamps
for each frame it processes. When an entry is ready to be aged, the entry is removed from the table, and a
“Delete MAC Address” message is sent to inform the CPU.
Supported entry types are dynamic, static, source filter, destination filter, IP multicast, source and destination
filter, and secure MAC address. Only dynamic entries can be aged; whether an entry is static or dynamic is
maintained in the “status” field of the MCT data structure.
5.3.4 Data Structure
The MCT data structure is used for searching for MAC addresses. The structure is maintained by hardware in
the search engine. The CPU can make requests to add to, delete from, or search the MCT database. The
database is essentially a hash table, with collisions resolved by chaining. The database is partially external, and
partially internal, as described earlier: the first MCT entry of each linked list is always located in the external
SRAM, and the subsequent MCTs are located internally.
5.3.5 VLAN Port Association Table
31
30
29
27
26
0
Valid
Route
Reserved
Port 8 to 0 is VLAN status
Port 8
Port 7
Port 6
Port 5
Port 4
Port 3
Port 2
Port 1
Port 0
VLAN
status
VLAN
status
VLAN
status
VLAN
status
VLAN
status
VLAN
status
VLAN
status
VLAN
status
VLAN
status
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MVU10-10FBX | 功能描述:端子 BLOCK FORK VNYL INS BTL BS-33-10-P 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 |
| MVU10-10FBX-BOTTLE | 功能描述:CONN FORK BLOCK INSUL 50PC RoHS:是 類別:連接器，互連式 >> 端子 - 鏟形 系列:Scotchlok™ 標(biāo)準(zhǔn)包裝:1 系列:Scotchlok™ 端子類型:彈簧，壓接式 接線柱/接片尺寸:10 接線柱 寬度 - 外邊:0.320"（8.13mm） 長(zhǎng)度 - 總體:1.030"（26.16mm） 安裝類型:自由懸掛 端子:壓接 線規(guī):10-12 AWG 絕緣體:絕緣 特點(diǎn):- 顏色:黃 包裝:散裝 觸點(diǎn)表面涂層:錫 觸點(diǎn)材料:銅，ETP 絕緣體直徑:0.250"（6.35mm） 材料 - 絕緣體:聚酰胺（PA），尼龍 長(zhǎng)度 - 環(huán)心道末端:0.280"（7.11mm） 長(zhǎng)度 - 末端:0.550"（13.97mm） 內(nèi)部舌簧打開:- 相關(guān)產(chǎn)品:TR-490-ND - HAND CRIMP TOOL RACHET 10-22 AWGTH-450-ND - TOOL HAND CRIMP 6-26AWGTR-482-ND - TOOL RATCHETING 10-22AWG CRIMP920099-R-ND - TOOL 10-22AWG SCOTCHLOK CRIMP 其它名稱:000511285879115112858791180611464373 |
| MVU10-10FFBK | 功能描述:端子 D-12-1103K BS-23-10-P 85505 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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