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TNETX15VE 数据表(PDF) 7 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) 7 Page - Texas Instruments

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TNETX15VE
VLAN-ENGINE ADDRESS-LOOKUP DEVICE
SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997
7
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
Terminal Functions
EAM interface
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
EAM15†
106
External address match single-/multiple-port routing code select. When EAM15 is high, the EAM-interface
terminals contain a single-port routing code. When EAM15 is low, the EAM-interface terminals contain a
EAM14
105
terminals contain a single ort routing code. When EAM15 is low, the EAM interface terminals contain a
multiple-port routing code (VLAN).
External address match port routing code select When EAM15 is high the EAM14 EAM0 terminals are
EAM13
104
External address match port routing code select. When EAM15 is high, the EAM14–EAM0 terminals are
placed in the single-port mode. In this mode EAM14–EAM0 terminals encode a single port to which the
EAM12
103
frame is routed.
EAM14–EAM5 are don’t-care bits and are set to 0 The single-port codes (EAM15–EAM0 terminals) are
EAM11
102
EAM14–EAM5 are don t-care bits and are set to 0. The single- ort codes (EAM15–EAM0 terminals) are
shown in the following:
EAM10
101
TNETX3150/TNETX3150A
EAM15–EAM0
15 14 13 12 11 10 9 8
7
6
5
4
3
2
1 0
EAM9
99
Port 00 (uplink)
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
b
15 14 13 12 11 10 9 8
7
6
5
4
3
2
1 0
EAM8
98
O
()
Port 01
Port 02
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
b
1000000000000010b
EAM7
97
O
Port 02
Port 03
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
b
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
b
EAM6
96
Port 04
Port 05
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
b
1000000000000101b
EAM5
95
Port 05
Port 06
P07
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
b
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
b
EAM4
94
Port 07
Port 08
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
b
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
b
EAM3
93
Port 08
Port 09
Port 10
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
b
1
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
b
1000000000001010b
EAM2
91
Port 10
Port 11
1
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
b
1
0
0
0
0
0
0
0
0
0
0
0
1
0
1
1
b
EAM1
90
Port 12
Port 13
1
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
b
1000000000001101b
EAM0‡
89
Port 13
Port 14
Rd
1
0
0
0
0
0
0
0
0
0
0
0
1
1
0
1
b
1
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
b
1000000000001111b
Reserved
No-operation code
1
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
b
1
x
x
x
x
x
x
x
x
x
x
1
x
x
x
x
b
The no-operation code signals that the EAM device does not take part in forwarding decisions on this
packet. The TNETX15VE does not put out this code in normal operations. To successfully disable the
TNETX15VE, it is reset and not started. This causes the EAM interface to float, and external pullup
resistors are required on EAM15 and EAM04 (minimally) to supply the no-operation code to the
TNETX3150/TNETX3150A device. Erratic operation occurs if the TNETX3150/TNETX3150A address
matching is not enabled when the TNETX15VE is disabled. The TNETX15VE, when enabled, overrides
the operations of the TNETX3150/TNETX3150A matching circuitry; but, it is strongly advised to disable
the TNETX3150/TNETX3150A address matching if the TNETX15VE is active. This prevents two logic
blocks from attempting to control port suspension and other functions.
† Most-significant bit
‡ Least-significant bit



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