TNETX3100 datasheet(50/80 Pages) TI1

50 / 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

internal and external frame-wrap example

Perform the following steps to configure the TNETX3100 for the internal frame-wrap configuration:

Step 1.

Disable any enternal address-matching hardware. (No traffic should be received by the TNETX3100

at this time.)

Step 2.

With power on, place TNETX3100 in a reset state by writing 0x81 at address 0x00D3.

Step 3.

While the TNETX3100 is in reset, configure the VLAN mask registers (0x00B8–0x00CB). For this

example, all ports are in the wrap chain.

VLAN0 MASK

0x0002

VLAN1 MASK

0x0004

VLAN2 MASK

0x0008

VLAN3 MASK

0x0010

VLAN4 MASK

0x0020

VLAN5 MASK

0x0040

VLAN6 MASK

0x0080

VLAN7 MASK

0x0100

VLAN8 MASK

0x0200

VLAN9 MASK

0x0001

Step 4.

Start the TNETX3100 by writing a 1 to the start bit and make sure the IOBMOD bit also is a 1

(0x21 at address 0x00D3).

Step 5.

Set all ports to full duplex and enable all ports.

Step 6.

Set the broadcast unknown (BRUN) bit to zero (address 0x00A1).

Step 7.

Configure the TNETX3100 for test mode by writing a 1 to the MTEST bit (address 0x00D2).

Step 8.

Configure the TNETX3100 for internal wrap mode by writing a 1 to the INTWRAP. See the data sheet

for INTWRAP details. The port that is not wrapped (00, 01, or 09) is used to inject and observe test

data frames from internally wrapped ports. For port 00, write 0x02 at address 0x00DD. For port 01,

write 0x40 at address 0x00DD. For port 09, write 0x06 at address 0x00DD.

Step 9.

Transmit a broadcast/multicast frame into the TNETX3100 port corresponding to the INTWRAP

setting. The frame that is sent into the test port is received by the same port (provided the VLAN

frame received and verify that the TNETX3100 is working correctly.

For external wrap mode, replace steps 8 and 9 with the following:

Step 8.

Configure the TNETX3100 for external wrap mode by writing 0x08 at address 0x00DD.

Step 9.

Configure all PHY – layer devices except port 00 for internal loopback.

Step 10.

Transmit a broadcast/multicast frame into the TNETX3100 on port 00. The frame that is sent into the

test port is received by the same port (provided the VLAN register settings steer the packet back to

that port). Compare the frame transmitted against the frame received and verify that the TNETX3100

is working correctly.

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