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LAN9500A Datasheet(PDF) 62 Page - Microchip Technology |
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LAN9500A Datasheet(HTML) 62 Page - Microchip Technology |
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62 / 213 page  LAN950x DS00001875A-page 62 2010 - 2015 Microchip Technology Inc. The Filter i Offset register defines the offset in the frame’s destination address field from which the frames are examined by Filter i. Table 5-51 describes the Filter i Offset bit fields. The Filter i CRC-16 register contains the CRC-16 result of the frame that should pass Filter i. Table 5-52 describes the Filter i CRC-16 bit fields. Table 5-53 indicates the cases that produce a wake when the Wakeup Frame Enable (WUEN) bit of the Wakeup Control and Status Register (WUCSR) is set. All other cases do not generate a wake. Note 5-21 As determined by bit 0 of Filter i Command. Note 5-22 CRC matches Filter i CRC-16 field. Note 5-23 As determined by bit 9 of WUCSR. TABLE 5-50: FILTER I COMMAND BIT DEFINITIONS FILTER i COMMANDS Bits Description 3:2 Address Type: Defines the destination address type of the pattern. 00 = Pattern applies only to unicast frames. 10 = Pattern applies only to multicast frames. X1 = Pattern applies to all frames that have passed the regular receive filter. 1 RESERVED 0 Enable Filter: When bit is set, Filter i is enabled, otherwise, Filter i is disabled. TABLE 5-51: FILTER I OFFSET BIT DEFINITIONS FILTER I OFFSET DESCRIPTION Bits Description 7:0 Pattern Offset: The offset of the first byte in the frame on which CRC is checked for Wakeup Frame recognition. The MAC checks the first offset byte of the frame for CRC and checks to determine whether the frame is a Wakeup Frame. Offset 0 is the first byte of the incoming frame's destination address. TABLE 5-52: FILTER I CRC-16 BIT DEFINITIONS FILTER I CRC-16 DESCRIPTION Bits Description 15:0 Pattern CRC-16: This field contains the 16-bit CRC value from the pattern and the byte mask programmed to the Wakeup Filter register function. This value is compared against the CRC calculated on the incoming frame, and a match indicates the reception of a Wakeup Frame. TABLE 5-53: WAKEUP GENERATION CASES Filter Enabled (Note 5-21) CRC Match (Note 5-22) Global Unicast Enabled (Note 5-23) Pass Regular Receive Filter Address Type (Note 5-24) Broad-cast Frame (Note 5-25) Multi-cast Frame Unicast Frame Yes Yes x x x Yes No No Yes Yes Yes x x No No Yes Yes Yes x Yes Multicast (=10) No Yes No Yes Yes x Yes Unicast (=00) No No Yes Yes YesxYes Passed Receive Filter (=x1b) xxx |
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