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LAN9218 参数 Datasheet PDF下载

LAN9218图片预览
型号: LAN9218
PDF下载: 下载PDF文件 查看货源
内容描述: 高性能单芯片10/100以太网控制器,带有HP Auto-MDIX的 [High-Performance Single- Chip 10/100 Ethernet Controller with HP Auto-MDIX]
分类和应用: 控制器以太网局域网(LAN)标准
文件页数/大小: 130 页 / 1558 K
品牌: SMSC [ SMSC CORPORATION ]
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High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX  
Datasheet  
Table 3.1 Address Filtering Modes (continued)  
MCPAS  
PRMS  
INVFILT  
HO  
HPFILT  
DESCRIPTION  
0
0
0
1
1
Hash Filtering for physical and  
multicast addresses  
0
X
1
0
1
0
1
0
0
0
X
0
0
X
X
Inverse Filtering  
Promiscuous  
Pass all multicast frames. Frames  
with physical addresses are  
perfect-filtered  
1
0
0
1
1
Pass all multicast frames. Frames  
with physical addresses are hash-  
filtered  
3.4  
Filtering Modes  
3.4.1  
Perfect Filtering  
This filtering mode passes only incoming frames whose destination address field exactly matches the  
value programmed into the MAC Address High register and the MAC address low register. The MAC  
address is formed by the concatenation of the above two registers in the MAC CSR Function.  
3.4.2  
Hash Only Filtering  
This type of filtering checks for incoming Receive packets with either multicast or physical destination  
addresses, and executes an imperfect address filtering against the hash table.  
During imperfect hash filtering, the destination address in the incoming frame is passed through the  
CRC logic and the upper six bits of the CRC register are used to index the contents of the hash table.  
The hash table is formed by merging the register’s multicast hash table high and multicast hash table  
low in the MAC CSR Function to form a 64-bit hash table. The most significant bit determines the  
register to be used (High/Low), while the other five bits determine the bit within the register. A value  
of 00000 selects Bit 0 of the multicast hash table low register and a value of 11111 selects Bit 31 of  
the multicast hash table high register.  
3.4.2.1  
Hash Perfect Filtering  
In hash perfect filtering, if the received frame is a physical address, the LAN9218 Packet Filter block  
perfect-filters the incoming frame’s destination field with the value programmed into the MAC Address  
High register and the MAC Address Low register. If the incoming frame is a multicast frame, however,  
the LAN9218 packet filter function performs an imperfect address filtering against the hash table.  
The imperfect filtering against the hash table is the same imperfect filtering process described in the  
“Hash Only Filtering” section above.  
3.4.2.2  
Inverse Filtering  
In inverse filtering, the Packet Filter Block accepts incoming frames with a destination address not  
matching the perfect address (i.e., the value programmed into the MAC Address High register and the  
MAC Address Low register in the CRC block and rejects frames with destination addresses matching  
the perfect address.  
For all filtering modes, when MCPAS is set, all multicast frames are accepted. When the PRMS bit is  
set, all frames are accepted regardless of their destination address. This includes all broadcast frames  
as well.  
Revision 1.5 (07-18-06)  
SMSC LAN9218  
DATA2S4HEET