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AL10051N1DL 参数 Datasheet PDF下载

AL10051N1DL图片预览
型号: AL10051N1DL
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  
3.2.2 Frame Transmission  
The AL103 transmits all frames in accordance to IEEE 802.3 standard. The AL103 will send the  
frames with a guaranteed minimum IPG (Inter Packet/Frame Gap) of 96BT even if the received  
frames have an IPG less than the minimum requirement. The AL103 also supports transmission of  
frames with an IPG of 64BT (optional). This option can be selected in System Register III, Bit 8,  
Register 02.  
3.2.3 Frame Generation  
During a transmit process the frame data is read from the memory buffer and forwarded to the  
destination port’s PHY device in di-bits. Seven bytes of preamble signal (10101010) will be  
generated first before the SFD (10101011). Frame data is sent after the SFD along with four-bytes  
of FCS at the end.  
3.3 Half Duplex Mode Operation  
For half-duplex operation, the MAC logic will abort the transmit-process if collision is detected.  
Re-transmission of the frame is scheduled in accordance to IEEE 802.3’s truncated binary  
exponential back-off algorithm. If the transmit process has encountered 16 consecutive collisions,  
an excessive collision error is reported and AL103 will not try to re-transmit the frame unless the  
retry-on-excessive-collision (REC) option in System Register III (register 02) is enabled. When  
REC is enabled, the number of collisions are reset to zero and transmission is started as soon as 96  
bit time of inter packet gap is passed after the last collision. If a collision is detected after 512 BT of  
the transmission, a late collision error will be reported but the frame will still be retransmitted after  
proper back-off time.  
The AL103 also provides an option for an aggressive back-off in the System Configuration Register  
II (SuperMAC). This option allows the MAC to back-off only three slots. This will create a more  
aggressive channel capture behavior than the standard IEEE back-off algorithm.  
3.4 Secure Mode Operation  
The AL103 provides security support on a per port basis. Whenever the secure mode is enabled, the  
port will stop learning new addresses. The address table of each port will remain unchanged. In this  
mode of operation, the address lookup table will freeze and no additional new address will be  
learned.  
The AL103 provides two levels of security protection. The most severe intrusion protection is  
disabling a port if intrusion is experienced. The security management (SecMgmt bit in register 01)  
will disable a port if a frame with unlearned source address (SA) is received from a secured port  
(security violation). An alternative is to enable security at the local port level without the security  
management. When the AL103 is configured this way, the device will only discard frames that have  
security violations, which prevents intruders from accessing the network.  
9/00  
Reference Only / Allayer Communications  
18  
 
 
 
 
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