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AL10053N3DL 参数 Datasheet PDF下载

AL10053N3DL图片预览
型号: AL10053N3DL
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. Functional Description  
3.1 Data Reception  
The port will go into the receive-state when RX_DV in the MII interface is asserted. The MII  
(Media Independent Interface) presents the received data in four-bit nibbles that are synchronous to  
the receive clock (25 MHz for 100 Mbit/s or 2.5 MHz for 10 Mbit/s). The AL103 will then attempt  
to detect the occurrence of the SFD (Start Frame Delimiter) pattern “10101011.” All preamble data  
prior to SFD are discarded. Once SFD is detected from the MII interface, the frame data is  
forwarded and stored in the buffer of the switch.  
3.1.1 Illegal Frame Length  
During the receiving process, the AL103 MAC will monitor the length of the received frame. Legal  
Ethernet frames should have a length of no less than 64 bytes and no more than 1536 bytes. Any  
frames with illegal frame length are discarded.  
3.1.2 Long Frames  
The AL103 can handle frame size up to 1536 bytes. All frames longer than 1536 bytes will be  
th  
discarded. If the port continues to receive data after the 1536 byte, the port’s data will be filtered.  
If the port is in half-duplex mode, the port will no longer be able to transmit or receive data during  
the long frame reception.  
3.1.3 False Carrier Events  
If CRS (Carrier Sense) signal in the MII interface is asserted but the receive RX_DV (Receive Data  
Valid) signal is not asserted within 16BT (Bit Period), the port is considered to have a false carrier  
event.  
3.1.4 Frame Filtering  
The AL103 will make filtering and forwarding decisions for each frame received based on its frame  
routing table, VLAN Mapping, port state, and the system configuration.  
Under the following conditions, received frames are filtered:  
The AL103 will check all received frames for errors such as symbol error, FCS  
error, short event, runt, long event, etc. Frames with any kind of error will not be  
forwarded to their destination port.  
Any frame heading to its own source port will be filtered.  
Frames heading to a disabled receiving port will be filtered.  
If the input buffer of the port is full, the incoming frame will be discarded. It is  
recommended that the flow control be used to prevent any loss of data. If the flow  
control option is enabled, this event will not occur. The remote station will  
transmit frame when the input buffer becomes available.  
If the frame has any security violation and the security option is enabled at the  
receiving port.  
9/00  
Reference Only / Allayer Communications  
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