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TNETX4080 数据表(PDF) 49 Page - Texas Instruments |
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TNETX4080 数据表(HTML) 49 Page - Texas Instruments |
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49 / 64 page ![]() TNETX4080 ThunderSWITCH II™ 8-PORT 10-/100-MBIT/S ETHERNET™ SWITCH SPWS050A – AUGUST 1998 – REVISED NOVEMBER 1998 49 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 duplex wrap test Duplex wrap test is similar to internal wrap mode (see Figure 9). The ports can be set to accept frame data that is wrapped at the PHY. This permits network connections between the device and the PHY to be verified. Any port can be the source port (not just the NM port as shown in Figure 8). By using multicast/broadcast frames, traffic can be routed selectively between ports involved in the test or return the frame directly before retransmission on the uplink. Software control of the external PHYs is required to configure them for loopback. Duplex frame-wrap test mode is selected by setting dpwrap in SysTest. When selected, the port is forced into full duplex, allowing it to receive frames it transmits. The switch is configured in the same manner as internal wrap. TNETX4080 07 06 05 04 03 02 01 00 NM PHY PHY Figure 9. Duplex Wrap Example |
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