TNETX3100 datasheet(49/80 Pages) TI1

49 / 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 frame-wrap test mode (continued)

TNETX3100

Figure 11. Internal Frame-Wrap Test (Wrapped Between Multiple Ports

Using Broadcast Frames and VLAN Registers)

By injecting broadcast or multicast frames into the source port and setting the VLAN registers, frames can be

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

The operational status of the PHY (or external connections to the TNETX3100) do not have to be considered

or assumed good when in internal-loopback mode.

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 TNETX3100 and the PHY to be verified. 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 12).

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

selected, the port is forced into full duplex, allowing it to receive the frame it transmits to the PHY (see DIATST

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.

TNETX3100

PHY

Figure 12. External Frame-Wrap Test (Wrapped Between Multiple Ports

Using Broadcast Frames and VLAN Registers)

TNETX3100 数据表(PDF) 49 Page - Texas Instruments