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LAN9115 Datasheet(PDF) 19 Page - Microchip Technology |
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LAN9115 Datasheet(HTML) 19 Page - Microchip Technology |
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19 / 114 page  2005-2016 Microchip Technology Inc. DS00002269A-page 19 LAN9115 The MAC Function recognizes transmitted and received frames tagged with either one-level or two-level VLAN IDs. The MAC compares the thirteenth and fourteenth bytes of transmit and receive frames to the contents of both the one-level VLAN tag register and the two-level VLAN tag register. If a match is found, the MAC Function identifies the frame as either a one- or two-level VLAN frame, depending on where the match was found. Upon recognizing that a frame has a VLAN tag, counter thresholds are adjusted to account for the extra bytes that the VLAN tag adds to the frame. The maximum length of the good packet is thus changed from 1518 bytes to 1522 bytes. FIGURE 3-2: VLAN FRAME |
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