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TNETE2008 Datasheet(PDF) 11 Page - Texas Instruments |
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TNETE2008 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 33 page TNETE2008 OctalPHY EIGHT 10BASE-T PHYSICAL-LAYER INTERFACES SPWS042B – DECEMBER 1997 – REVISED JUNE 1998 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 polarity reversal The TNETE2008 can detect reversed polarity of its receiver inputs (e.g., due to incorrect cable wiring). If at any time, seven consecutive inverted link pulses are detected, then, reversed polarity is assumed, and the octal swaps the RCVP and RCVN inputs of the affected PHY. Once a single, correct link pulse is received, good polarity is assumed. autonegotiation The TNETE2008 supports IEEE Std 802.3 autonegotiation to full duplex where allowed by a link partner. Each PHY on the device is capable of independent autonegotiation. When enabled, this feature allows a PHY to negotiate with the other PHY on its link segment, to establish their highest common protocol. Until a PHY has completed its negotiation, it does not assert IFLINK. When autonegotiation is disabled for a PHY, via the extended multiplexed MAC interface, link is indicated on receipt of valid data or link pulses. loopback test mode By asserting the LOOPBACK terminal on the device, the transmit circuit of each PHY is looped to the corresponding receive circuit; therefore, transmit drivers do not forward any further packet data to the network but continue to send link pulses. Since there is only one LOOPBACK terminal on the package, all eight PHYs simultaneously are placed into loopback mode. While in loopback mode, all network receive activity, other than the link pulses, is ignored. However, squelch information is still processed, allowing the link status to be maintained under momentary loopback self-test. During loopback, IFLINK is driven high for all channels, regardless of the state of the links on all channels. When LOOPBACK goes high, the true state of link on each channel is reported. Although the TNETE2008 places no restrictions on the format of transmitted data, looped-back data should begin with a preamble and a start-of-frame delimiter to avoid spurious behavior of the receive-data recovery circuitry. |
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