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參數(shù)資料
| 型號： | MVTX2601 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | Unmanaged 24-Port 10/100 Mbps Ethernet Switch |
| 中文描述： | 非托管的24端口10/100 Mbps以太網(wǎng)交換機 |
| 文件頁數(shù)： | 12/91頁 |
| 文件大小： | 686K |
| 代理商： | MVTX2601 |
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MVTX2601
Data Sheet
12
Zarlink Semiconductor Inc.
2.3.2 Read Command
All registers in MVTX2601 can be modified through this synchronous serial interface.
3.0 MVTX2601 Data Forwarding Protocol
3.1 Unicast Data Frame Forwarding
When a frame arrives, it is assigned a handle in memory by the Frame Control Buffer Manager (FCB Manager). An
FCB handle will always be available because of advance buffer reservations.
The memory (SRAM) interface consists of a 64-bit bus connected to SRAM bank. The Receive DMA (RxDMA) is
responsible for multiplexing the data and the address. On a port’s “turn,” the RxDMA will move 8 bytes (or up to the
end-of-frame) from the port’s associated RxFIFO into memory (Frame Data Buffer, or FDB).
Once an entire frame has been moved to the FDB and a good end-of-frame (EOF) has been received, the Rx
interface makes a switch request. The RxDMA arbitrates among multiple switch requests.
The switch request consists of the first 64 bytes of a frame, containing among other things, the source and
destination MAC addresses of the frame. The search engine places a switch response in the switch response
queue of the frame engine when done. Among other information, the search engine will have resolved the
destination port of the frame and will have determined that the frame is unicast.
After processing the switch response, the Transmission Queue Manager (TxQ manager) of the frame engine is
responsible for notifying the destination port that it has a frame to forward to it. But first, the TxQ manager has to
decide whether or not to drop the frame, based on global FDB reservations and usage, as well as TxQ occupancy
at the destination. If the frame is not dropped, then the TxQ manager links the frame’s FCB to the correct per-port-
per-class TxQ. Unicast TxQ’s are linked lists of transmission jobs, represented by their associated frames’ FCB’s.
There is one linked list for each transmission class for each port. There are 4 transmission classes for each of the
24 10/ 100 ports
The TxQ manager is responsible for scheduling transmission among the queues representing different classes for a
port. When the port control module determines that there is room in the MAC Transmission FIFO (TxFIFO) for
another frame, it requests the handle of a new frame from the TxQ manager. The TxQ manager chooses among
the head-of-line (HOL) frames from the per-class queues for that port, using a Zarlink Semiconductor scheduling
algorithm.
The Transmission DMA (TxDMA) is responsible for multiplexing the data and the address. On a port’s turn, the
TxDMA will move 8 bytes (or up to the EOF) from memory into the port’s associated TxFIFO. After reading the EOF,
the port control requests a FCB release for that frame. The TxDMA arbitrates among multiple buffer release
requests.
The frame is transmitted from the TxFIFO to the line.
STROBE-
D0
AUTOFD-
A0
A0
A1
A2
A2
...
A9
A10 A11
R
D0
D1
D2
D3
D4 D5
D6 D7
START
ADDRESS
COMMAND
DATA
A9
A1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MVTX2601AG | Unmanaged 24-Port 10/100 Mbps Ethernet Switch |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MVTX2601A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Unmanaged 24 port 10/100Mb Ethernet switch |
| MVTX2601AG | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Unmanaged 24-Port 10/100 Mbps Ethernet Switch |
| 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 |
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