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TNETX15VE 数据表(PDF) 44 Page - Texas Instruments

部件名 TNETX15VE
功能描述  VLAN-ENGINE ADDRESS-LOOKUP DEVICE
PDF  113 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

TNETX15VE 数据表(HTML) 44 Page - Texas Instruments

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TNETX15VE
VLAN-ENGINE ADDRESS-LOOKUP DEVICE
SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997
44
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
VLAN routing mask registers, VLANmask at 0x50–0x6F (DIO)
BYTE 3
BYTE 2
BYTE 1
BYTE 0
DIO ADDRESS
VLANmask1
VLANmask0
0x50
VLANmask3
VLANmask2
0x54
Reserved
0x58
Reserved
0x5C
Reserved
0x60
Reserved
0x64
Reserved
0x68
Reserved
0x6C
Each VLANmask register corresponds one-to-one to a VLAN value. The TNETX15VE currently supports four
VLANs, but space is reserved for future inclusion of 16 VLANs. The VLANmask register has the following format:
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reserved
VLANmask
Initial Values After Reset
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
The VLANmask registers are used in two ways.
• When an address is not found, the VLANmask register (corresponding to the VLAN assigned to the
source port) is used as an unknown routing mask. Frames are forwarded to the ports specified in the
registers.
• When a multicast address is found in the lookup table, the lookup table port bit map is masked using the
VLANmask register corresponding to the VLAN assigned to the source port. The VLANmask masks
destination ports on a VLAN. The vectors for each VLAN allow the user to restrict broadcast traffic on
that VLAN to only the ports in that VLAN that require it.



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