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LAN9215I-MT 参数 Datasheet PDF下载

LAN9215I-MT图片预览
型号: LAN9215I-MT
PDF下载: 下载PDF文件 查看货源
内容描述: 高效的单芯片10/100以太网控制器与HP Auto-MDIX的和工业温度支持 [Highly Efficient Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support]
分类和应用: 外围集成电路数据传输控制器局域网以太网局域网(LAN)标准时钟
文件页数/大小: 134 页 / 1602 K
品牌: SMSC [ SMSC CORPORATION ]
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Highly Efficient Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support  
Datasheet  
3.5  
Wake-up Frame Detection  
Setting the Wake-Up Frame Enable bit (WUEN) in the “WUCSR—Wake-up Control and Status  
Register”, places the LAN9215I MAC in the wake-up frame detection mode. In this mode, normal data  
reception is disabled, and detection logic within the MAC examines receive data for the pre-  
programmed wake-up frame patterns. The LAN9215I can be programmed to notify the host of the  
wake-up frame detection with the assertion of the host interrupt (IRQ) or assertion of the power  
management event signal (PME). Upon detection, the Wake-Up Frame Received bit (WUFR) in the  
WUCSR is set. When the host clears the WUEN bit the LAN9215I will resume normal receive  
operation.  
Before putting the MAC into the wake-up frame detection state, the host must provide the detection  
logic with a list of sample frames and their corresponding byte masks. This information is written into  
the Wake-up Frame Filter register (WUFF). Please refer to Section 5.4.11, "WUFF—Wake-up Frame  
Filter," on page 107 for additional information on this register.  
The MAC supports four programmable filters that support many different receive packet patterns. If  
remote wake-up mode is enabled, the remote wake-up function receives all frames addressed to the  
MAC. It then checks each frame against the enabled filter and recognizes the frame as a remote wake-  
up frame if it passes the wakeup frame filter register’s address filtering and CRC value match.  
In order to determine which bytes of the frames should be checked by the CRC module, the MAC uses  
a programmable byte mask and a programmable pattern offset for each of the four supported filters.  
The pattern’s offset defines the location of the first byte that should be checked in the frame. Since  
the destination address is checked by the address filtering Function, the pattern offset is always greater  
than 12.  
The byte mask is a 31-bit field that specifies whether or not each of the 31 contiguous bytes within  
the frame, beginning in the pattern offset, should be checked. If bit j in the byte mask is set, the  
detection logic checks byte offset +j in the frame. In order to load the Wake-up Frame Filter register,  
the host LAN driver software must perform eight writes to the Wake-up Frame Filter register (WUFF).  
The Diagram shown in Table 3.2, "Wake-Up Frame Filter Register Structure" below, shows the wake-  
up frame filter register’s structure.  
Note 3.1 Wake-up frame detection can be performed when the LAN9215I is in the D0 or D1 power  
states. In the D0 state, wake-up frame detection is enabled when the WUEN bit is set.  
Note 3.2 Wake-up frame detection, as well as Magic Packet detection, is always enabled and  
cannot be disabled when the device enters the D1 state.  
Table 3.2 Wake-Up Frame Filter Register Structure  
Filter 0 Byte Mask  
Filter 1 Byte Mask  
Filter 2 Byte Mask  
Filter 3 Byte Mask  
Reserved  
Filter 3  
Command  
Reserved  
Filter 2  
Command  
Reserved  
Filter 1  
Command  
Reserved  
Filter 0  
Command  
Filter 3 Offset  
Filter 1 CRC-16  
Filter 3 CRC-16  
Filter 2 Offset  
Filter 1Offset  
Filter 0 Offset  
Filter 0 CRC-16  
Filter 2 CRC-16  
The Filter i Byte Mask defines which incoming frame bytes Filter i will examine to determine whether  
or not this is a wake-up frame. Table 3.3, describes the byte mask’s bit fields.  
Revision 1.5 (07-18-06)  
SMSC LAN9215I  
DATA2S6HEET  
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