- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄359243 > MVTX2803AG (ZARLINK SEMICONDUCTOR INC) Unmanaged 8-Port 1000 Mbps Ethernet Switch PDF資料下載
參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 25/127頁 |
| 文件大?。?/td> | 1706K |
| 代理商： | MVTX2803AG |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁當(dāng)前第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁
MVTX2803
Data Sheet
25
Zarlink Semiconductor Inc.
The MVTX2803AG does provide a system-wide option of permitting normal QoS scheduling (and buffer use) for
frames originating from flow control enabled ports. When this programmable option is active, it is possible that
some packets may be dropped, even though flow control is on. The reason is that intelligent packet dropping is
a major component of the MVTX2803AG’s approach to ensuring bounded delay and minimum bandwidth for
high priority flows.
7.9.1 Unicast Flow Control
For unicast frames, flow control is triggered by source port resource availability. Recall that the MVTX2803AG’s
buffer management scheme allocates a reserved number of FDB slots for each source port. If a programmed
number of a source port’s reserved FDB slots have been used, then flow control Xoff is triggered. Xon is
triggered when a port is currently being flow controlled, and all of that port’s reserved FDB slots have been
released.
Note that the MVTX2803AG’s per-source-port FDB reservations assure that a source port that sends a single
frame to a congested destination will not be flow controlled.
7.9.2 Multicast Flow Control
When port based Vlan is not used, a global buffer counter (64 packets) triggers flow control for multicast
frames. When the system exceeds a programmable threshold of multicast packets, Xoff is triggered. Xon is
triggered when the system returns below this threshold. MCC register programs the threshold. When port based
Vlan is used, each Vlan has a global buffer counter.
In addition, each source port has an 8-bit port map recording which port or ports of the multicast frame’s fanout
were congested at the time Xoff was triggered. All ports are continuously monitored for congestion, and a port is
identified as uncongested when its queue occupancy falls below a fixed threshold. When all those ports that
were originally marked as congested in the port map have become uncongested, then Xon is triggered, and the
8-bit vector is reset to zero.
The MVTX2803AG also provides the option of disabling VLAN multicast flow control.
Note:
If port flow control is on, QoS performance will be affected. To determine the most efficient way to
program, please refer to the QoS Application Note.
7.10 Mapping to IETF Diffserv Classes
The mapping between priority classes discussed in this chapter and elsewhere is shown below.
As the table illustrates, P7 is used solely for network management (NM) frames. P6 is used for expedited
forwarding service (EF). Classes P2 through P5 correspond to an assured forwarding (AF) group of size 4. Finally,
P0 and P1 are two best effort (BE) classes.
Features of the MVTX2803AG that correspond to the requirements of their associated IETF classes are
summarized in the following below.
MVTX2803AG
P7
P6
P5
P4
P3
P2
P1
P0
IETF
NM
EF
AF0
AF1
AF2
AF3
BE0
BE1
Table 4 - Mapping between MVTX2803AG and IETF Diffserv Classes for Gigabit Ports
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MVTX2804 | 8-Port 1000 Mbps Ethernet Distributed Switch |
| MVTX2804AG | 8-Port 1000 Mbps Ethernet Distributed Switch |
| MVV200 | Analog IC |
| MW005A | DC-to-DC Voltage Converter |
| MW005AJ | DC-to-DC Voltage Converter |
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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。