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AL10051N3DL 参数 Datasheet PDF下载

AL10051N3DL图片预览
型号: AL10051N3DL
PDF下载: 下载PDF文件 查看货源
内容描述: 薄膜片式电感器 [THIN FILM CHIP INDUCTOR]
分类和应用: 电感器
文件页数/大小: 66 页 / 368 K
品牌: ABC [ ABC Taiwan Electronics Corp ]
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AL103 Revision 1.0  
3.5 Address Learning  
The Table Lookup Engine provides the switching information required to route data frames. The  
address lookup table is set-up through auto address learning (dynamic) or manual entry (static). The  
static addresses are assigned to the address table by the EEPROM. All static address entries will not  
be aged or updated by the AL103.  
After a frame is received by the AL103, the embedded (SA) and destination address (DA) are  
retrieved. The source address retrieved from the received frame is automatically stored in a SA  
buffer. The AL103 will then check for error and security violations, and perform a SA search. If  
there is no error or security violation, the AL103 will store the source address in the address lookup  
table. If the SA has been previously stored in another port’s SA table, the AL103 will delete the SA  
from the previously stored location.  
The Individual MAC Address is a 48-bit unique MAC address to be programmed or learned. Bit 0  
of a SA will be masked, i.e. no multicast SA.  
The AL103 provides an on-chip 1K MAC Address-to-PortID/TrunkID table for the frame  
destination lookup operations.  
The AL103 address table contains both static addresses input by the EEPROM and dynamically  
learned address. It learns the individual MAC addresses from frame received with no errors from  
the local ports.  
For received frames that contain a source address learned in another port’s address table, that hasn’t  
been aged out, perform the following based on the switches; if the security option is selected for the  
port, the AL103 considers this a security violation; if port is a non-protected port, the AL103 will  
delete the SA from the previous port’s address table and update it to the current port’s address table.  
However, if the SA is a static address entry, the address will not be updated.  
3.5.1 Address Aging  
A port’s MAC address register is cleared on power-up, or hardware reset. If the SA aging option is  
enabled, the dynamically learned SA will be cleared if it is not refreshed within the programmed  
time.  
3.6 VLAN Support  
Each port of the AL103 can be assigned to one or multiple VLANs. Frames from the source port  
will only be forwarded to destination ports within the same VLAN domain. A broadcast/multicast  
frame will be forwarded to all ports within the VLAN(s) except the source port itself. A unicast  
frame will be forwarded to the destination port only if the destination port is in the same VLAN as  
the source port. Otherwise, the frame will be treated as a frame with unknown DA. If the  
destination port belongs to the another VLAN, the frame will be discarded and the event will be  
recorded as a VLAN boundary violation.  
Each port can be assigned with a dedicated uplink port. Unicast frames with unknown destination  
addresses will be forwarded to the uplink port of the source port. An uplink port can be either a  
single port or a trunk.  
The AL103 provides one VLAN register per ports (register 1E to 2C) for mapping to 8-ports (8-  
bits). Each register contains an 8-bit map to indicate the VLAN group for the port.  
9/00  
Reference Only / Allayer Communications  
19  
 
 
 
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