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TNETX3100 数据表(PDF) 16 Page - Texas Instruments

部件名 TNETX3100
功能描述  ThunderSWITCHE 10-PORT 10-/100-MBIT/S ETHERNETE SWITCH
PDF  80 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

TNETX3100 数据表(HTML) 16 Page - Texas Instruments

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TNETX3100
ThunderSWITCH™ 10-PORT 10-/100-MBIT/S ETHERNET™ SWITCH
SPWS031D – JUNE 1997 – REVISED OCTOBER 1997
16
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
uplink TX pretagging to support an external routing engine
When forwarding frames to a routing engine, it is necessary to know which port received the frame. Multiple
TNETX3100 devices can be incorporated into a larger switch fabric that is controlled by one routing engine. The
TNETX3100 provides one nibble of information (to identify the source port) on the MII-interface data terminals
prior to M00TXEN being asserted. See Figure 2.
M00TCLK
M00TXD3–
M00TXD0
M00COL
Don’t Care
Tag
Preamble, DA, SA, Data, CRC
M00TXEN
Don’t Care
Figure 2. Multiplex Operation for Uplink-Port Transmit Frames
Port 00, when operated at 100-Mbit/s mode, provides a tag nibble one cycle prior to M00TXEN being asserted.
The nibble format is shown in Table 1.
Table 1. Source Port Number Codes
SOURCE
PORT NUMBER
M00TXD3–M00TXD0
PORT
0000
Reserved
0001
Port 01 (10/100 Mbit/s)
0010
Port 02 (10/100 Mbit/s)
0011
Port 03 (10 Mbit/s)
0100
Port 04 (10 Mbit/s)
0101
Port 05 (10 Mbit/s)
0110
Port 06 (10 Mbit/s)
0111
Port 07 (10 Mbit/s)
1000
Port 08 (10 Mbit/s)
1001
Port 09 (10 Mbit/s)
1010
Reserved
1011
Reserved
1100
Reserved
1101
Reserved
1110
Reserved
1111
Reserved



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