TNETX3100 datasheet(16/80 Pages) TI1

16 / 80 page

TNETX3100

ThunderSWITCH™ 10-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS031D – JUNE 1997 – REVISED OCTOBER 1997

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

TNETX3100 Datasheet(PDF) 16 Page - Texas Instruments

TNETX3100 Datasheet(HTML) 16 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

Datasheet Download

Link URL