TNETX15VE datasheet(78/113 Pages) TI1

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TNETX15VE

VLAN-ENGINE ADDRESS-LOOKUP DEVICE

SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

guidelines for calculating the value of VLANmask from the VLAN assignments

Addresses that are unknown are broadcast using the VLANmask register for the source-port VLAN. A simple

way of determining the value of these registers is discussed. The VLANmask is calculated from the VLANID

and tagVLAN register array.

If the TNETX3150/TNETX3150A/TNETX3100 and TNETX15VE chipset is stand alone, the VLANmask

registers have a bit set for each port that belongs to that VLAN. All the entries in the tagVLAN array must agree,

to indicate what VLAN port 00 belongs to.

If the chipset is cascaded/expanded (where port 00 is relative to other intranetworking equipment rather than

end users/segments), the VLANmask register has a bit set for each port that belongs to that VLAN plus a 1 in

port 00s position if stations in the VLAN are on the other side of port 00. The entries in the tagVLAN array

correlate the inbound pretag with the appropriate VLAN.

The following example is for the reference side of a cascaded TNETX3150/TNETX3150A and TNETX15VE:

(Locally VLANs 0 and 2

are used)

(Remotely VLANs 0, 1, and 3

are used)

VLANID1 = 0x2

TagVLAN0 = 0x0

VLANID2 = 0x2

TagVLAN1 = 0x0

VLANID3 = 0x0

TagVLAN2 = 0x0

VLANID4 = 0x2

TagVLAN3 = 0x1

VLANID5 = 0x2

TagVLAN4 = 0x0

VLANID6 = 0x2

TagVLAN5 = 0x3

VLANID7 = 0x0

TagVLAN6 = 0x3

VLANID8 = 0x0

TagVLAN7 = 0x0

VLANID9 = 0x0

TagVLAN8 = 0x0

VLANID10 = 0x2

TagVLAN9 = 0x3

VLANID11 = 0x0

TagVLAN10 = 0x0

VLANID12 = 0x0

TagVLAN11 = 0x3

VLANID13 = 0x2

TagVLAN12 = 0x0

VLANID14 = 0x0

TagVLAN13 = 0x0

TagVLAN14 = 0x0

TagVLAN15 = 0x0

Then, the VLANmask registers should be as follows: VLANmask0 = 0x5B89, VLANMASK1 = 0x0001,

VLANmask2 = 0x2476, AND VLANmask3 = 0x0001.

VLAN

PORT

VLAN

TNETX15VE 数据表(PDF) 78 Page - Texas Instruments

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