參數(shù)資料
型號: MDS212
廠商: Zarlink Semiconductor Inc.
英文描述: 12-Port 10/100Mbps Ethernet Switch
中文描述: 12端口10/100Mbps以太網(wǎng)交換機
文件頁數(shù): 28/111頁
文件大?。?/td> 1609K
代理商: MDS212
MDS212
Data Sheet
28
Zarlink Semiconductor Inc.
Note:
FE = Frame Engine, SE = Search Engine
In unmanaged mode, the system does not support VLAN features. Thus, VLAN related tables are not required.
Table 3 - Frame Buffer Memory Usage for Unmanaged Mode
5.2.1 Memory Allocation Of A Managed System
In a managed system, the Frame Buffer Memory is partitioned into five segments: Frame Data Buffers (FDBs),
Transmission Queues, Mailing Lists, VLAN, and MCT VLAN Association Tables.
5.2.1.1 Frame Data Buffers
The Frame Data Buffers (FDBs) accommodate the incoming data frames and partition them into data blocks, where
each block occupies 1.5K bytes. The number of data blocks in a FDB is configured by setting the value in the
register FCBSL[9:0]. Since MDS212 supports up to 2M Bytes memory, the maximum number of data blocks is 1K.
Note:
The FDB must start at location 0.
Description
Unit Size
Unit Count
Total Size
Reference by
Frame Data Buffer
(FDB)
1.5 Kbytes
256 to 1K
384 K bytes to 1.5M bytes
FE
Transmission
Queue
4 bytes x 128K
to 4 bytes x 1K
48 (4 level
priority)
12 (1 level
priority)
24 Kbytes to 192Kbytes (at
4 level priority)
FE
HISC Mailing List
32 Bytes to
64Bytes
(Programmable)
128 to 1K
4K bytes to
32 Kbytes
(at 32 Bytes each)
HISC & SE
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相關(guān)代理商/技術(shù)參數(shù)
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