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TNETX15VE 数据表(PDF) 106 Page - Texas Instruments |
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TNETX15VE 数据表(HTML) 106 Page - Texas Instruments |
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106 / 113 page  TNETX15VE VLAN-ENGINE ADDRESS-LOOKUP DEVICE SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997 106 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION VLAN support for proprietary systems In a third-party application the pretag can be used to transfer the VLANID for frames that are sourced by the system to the TNETX3150/TNETX3150A and eventually to the TNETX15VE. Since the pretag is used as an offset in the tagVLAN registers, they must be configured one-to-one so that the tagVLAN offset agrees one-to-one with the VLANID. The current TNETX15VE implements two bits of VLANID (four possible VLANs), where the pretag field (which is used to index into the tagVLAN array) is four bits. As the designer is deciding on the pretag bit fields, and the entries for the tagVLAN array for translation into VLANids for the inbound packets, there are multiple array entries that can be used in this version of the TNETX15VE. TagVLAN0 to tagVLAN3 is recommended as future versions can be equipped with four bits of VLANid. |
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