 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
LAN9252/ML 数据表(PDF) 134 Page - Microchip Technology |
|
|
|||||||||||||||||||||||||||||
LAN9252/ML 数据表(HTML) 134 Page - Microchip Technology |
|
|
134 / 329 page  LAN9252 DS00001909A-page 134 2015 Microchip Technology Inc. At the completion of the CRC-16 checking process, the CRC-16 calculated using the pattern offset and byte mask is compared to the expected CRC-16 value associated with the filter. If a match occurs, a remote wake-up event is sig- naled. The frame must also pass the FCS check and packet length checking. Table 11-4 indicates the cases that produce a wake-up event. All other cases do not generate a wake-up event. As an example, the Host system must perform the following steps to enable the device to detect a Wakeup Frame WoL event: Declare Pattern: 1. Update the PHY x Wakeup Filter Byte Mask Registers (PHY_WUF_MASK_x) to indicate the valid bytes to match. 2. Calculate the CRC-16 value of valid bytes offline and update the PHY x Wakeup Filter Configuration Register B (PHY_WUF_CFGB_x). CRC-16 is calculated as follows: At the start of a frame, CRC-16 is initialized with the value FFFFh. CRC-16 is updated when the pattern offset and mask indicate the received byte is part of the checksum calculation. The following algorithm is used to update the CRC-16 at that time: Let: ^ denote the exclusive or operator. Data [7:0] be the received data byte to be included in the checksum. CRC[15:0] contain the calculated CRC-16 checksum. F0 … F7 be intermediate results, calculated when a data byte is determined to be part of the CRC-16. Calculate: F0 = CRC[15] ^ Data[0] F1 = CRC[14] ^ F0 ^ Data[1] F2 = CRC[13] ^ F1 ^ Data[2] F3 = CRC[12] ^ F2 ^ Data[3] F4 = CRC[11] ^ F3 ^ Data[4] F5 = CRC[10] ^ F4 ^ Data[5] F6 = CRC[09] ^ F5 ^ Data[6] F7 = CRC[08] ^ F6 ^ Data[7] The CRC-32 is updated as follows: CRC[15] = CRC[7] ^ F7 CRC[14] = CRC[6] CRC[13] = CRC[5] CRC[12] = CRC[4] CRC[11] = CRC[3] TABLE 11-4: WAKEUP GENERATION CASES Filter Enabled Frame Type CRC Matches Address Match Enabled Any Mcast Enabled Bcast Enabled Frame Address Matches Yes Unicast Yes No X X X Yes Unicast Yes Yes X X Yes Yes Multicast Yes X Yes X X Yes Multicast Yes Yes No X Yes Yes Broadcast Yes X X Yes X |
|
链接网址 |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 数据表链接 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
