TNETX3150 datasheet(77/113 Pages) TI1

77 / 113 page

TNETX3150/TNETX3150A

ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

external frame-wrap test mode

Similar to internal frame-wrap mode, the ports can be set to accept frame data that is wrapped at the PHY. This

permits network connections between the TNETX3150/TNETX3150A and the PHY to be verified. All frame data

for external frame-wrap testing must be received by port 00 (uplink). By using multicast/broadcast frames, traffic

is routed selectively between ports involved in the test (or return the frame directly) before retransmission on

port 00 (uplink) (see Figure 33).

External frame-wrap test mode is selected by setting the DPWRAP bit (bit 3) of the DIATST register. When

selected, the port is forced to receive the frame it transmits to the PHY (see DIATST register at 0x00DD).

By using broadcast or multicast frames and suitably setting the VLAN registers, frames are forwarded between

internally frame-wrapped ports before transmission of the frame on the source port.

TNETX3150/

TNETX3150A

PHY

Figure 33. External Frame-Wrap Test (wrapped between multiple ports

using broadcast frames and VLAN registers)

internal and external frame-wrap example

Perform the following steps to configure the TNETX3150/TNETX3150A for the internal frame-wrap

configuration:

NOTE:

No traffic should be received by the TNETX3150/TNETX3150A at this time; internal address

matching must be enabled and an external address matching device must be disabled.

Step 1.

With power on, place the TNETX3150/TNETX3150A in a reset state by writing 0x81 at address

0x00C3.

TNETX3150 データシート(PDF) 77 Page - Texas Instruments