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TNETE2008PBE Datasheet(PDF) 11 Page - Texas Instruments

Part # TNETE2008PBE
Description  OctalPHY EIGHT 10BASE-T PHYSICAL-LAYER INTERFACES
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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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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