參數(shù)資料
型號(hào)： MVTX2601AG
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 網(wǎng)絡(luò)接口
英文描述： Unmanaged 24-Port 10/100 Mbps Ethernet Switch
中文描述： DATACOM, LAN SWITCHING CIRCUIT, PBGA553
封裝： 37.50 X 37.50 MM, 2.33 MM HEIGHT, MS-034, HSBGA-553
文件頁(yè)數(shù)： 25/91頁(yè)
文件大?。?/td> 686K
代理商： MVTX2601AG
MVTX2601
Data Sheet
25
Zarlink Semiconductor Inc.
high-drop and low-drop percentages, which indicate the minimum and maximum percentages of the data that can
be discarded. The X, Y Z percent can be programmed by the register RDRC0, RDRC1. In Level 3, all packets are
dropped if the bytes in each priority queue exceed the threshold. Parameters A, B, C are the byte count thresholds
for each priority queue. They can be programmed by the QOS control register (refer to the register group 5). See
Programming Qos Registers Application Note for more information.
7.7 Buffer Management
Because the number of FDB slots is a scarce resource and because we want to ensure that one misbehaving
source port or class cannot harm the performance of a well-behaved source port or class, we introduce the concept
of buffer management into the MVTX2601. Our buffer management scheme is designed to divide the total buffer
space into numerous reserved regions and one shared pool as shown in Figure 9 on page 26.
As shown in the figure, the FDB pool is divided into several parts. A reserved region for temporary frames stores
frames prior to receiving a switch response. Such a temporary region is necessary, because when the frame first
enters the MVTX2601, its destination port and class are as yet unknown and so the decision to drop or not needs to
be temporarily postponed. This ensures that every frame can be received first before subjecting them to the frame
drop discipline after classifying.
Six reserved sections, one for each of the first six priority classes, ensure a programmable number of FDB slots per
class. The lowest two classes do not receive any buffer reservation. Furthermore, even for 10/100 Mbps ports, a
frame is stored in the region of the FDB corresponding to its class. As we have indicated, the eight classes use only
four transmission scheduling queues for 10/100 Mbps ports, but as far as buffer usage is concerned, there are still
eight distinguishable classes.
Another segment of the FDB reserves space for each of the 24 ports. One parameter can be set for the source port
reservation for 10/100 Mbps. These 24 reserved regions make sure that no well-behaved source port can be
blocked by another misbehaving source port.
In addition, there is a shared pool which can store any type of frame. The frame engine allocates the frames first in
the six priority sections. When the priority section is full or the packet has priority 1 or 0, the frame is allocated in the
shared poll. Once the shared poll is full the frames are allocated in the section reserved for the source port.
The following registers define the size of each section of the frame data buffer:
PR100 - Port Reservation for 10/100 Ports
SFCB - Share FCB Size
C2RS - Class 2 Reserve Size
C3RS - Class 3 Reserve Size
C4RS - Class 4 Reserve Size
C5RS - Class 5 Reserve Size
C6RS - Class 6 Reserve Size
C7RS- Class 7 Reserve Size
相關(guān)PDF資料
PDF描述
MVTX2602 Managed 24 Port 10/100 Mbps Ethernet Switch
MVTX2602AG Managed 24 Port 10/100 Mbps Ethernet Switch
MVTX2603 Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch
MVTX2603AG Unmanaged 24-Port 10/100 Mb + 2-Port 1 Gb Ethernet Switch
MVTX2604 Managed 24-Port 10/100 Mb + 2 Port 1 Gb Ethernet Switch
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MVTX2601AG2 制造商:Microsemi Corporation 功能描述:
MVTX2602 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Managed 24 Port 10/100 Mbps Ethernet Switch
MVTX2602A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MVTX260x Port Mirroring
MVTX2602AG 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Managed 24 Port 10/100 Mbps Ethernet Switch
MVTX2602AG2 制造商:Microsemi Corporation 功能描述:
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