STE10A datasheet(23/82 Pages) STMICROELECTRONICS

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STE10/100A

Functional description

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Data conversions of NRZI to NRZ and serial to parallel

After the data is recovered, it will be passed to the NRZI-to-NRZ converter to produce a

125MHz serial bit stream. This serial bit stream will be packed to parallel 5B type for further

processing. The NRZI to NRZ conversion may be bypassed by clearing ENRZI (bit 7 of

XR10) to 0.

De-scrambling and decoding of 5B/4B

The parallel 5B type data is passed to the de-scrambler and 5B/4B decoder to restore it to

its original MII nibble representation.

Carrier sensing

The carrier sense (CRS) signal is asserted when the transceiver detects any 2 non-

contiguous zeros within any 10-bit boundary of the receiving bit stream. CRS is de-asserted

when ESD code-group or Idle code-group is detected. In half duplex mode, CRS is asserted

during packet transmission or receive; in full duplex mode, CRS is asserted only during

packet reception.

10BASE-T transmission operation

The parallel-to-serial converter, Manchester Encoder, Link test, Jabber and the transmit

wave-shaper and line driver functions described in the section of “Wave-Shaper and Media

Signal Driver” of “100BASE-T Transmission Operation” are also provided for 10BASE-T

transmission. Additionally, Collision detection and SQE test for half duplex application are

provided.

10BASE-T receive operation

Carrier sense function, receiving filter, PLL for clock and data recovery, Manchester

decoder, and serial to parallel converter functions are provided to support 10BASE-T

reception.

Loop-back operation of transceiver

●

The transceiver provides internal loop-back (also called transceiver loop-back)

operation for both 100BASE-TX and 10BASE-T operation. The loop-back function can

be enabled by setting XLBEN (bit 14 of XR0) to 1. In loop-back mode, the TX± and RX±

lines are isolated from the media. The transceiver also provides remote loop-back

operation for 100BASE-TX operation. The remote loop-back operation can be enabled

by setting ENRLB (bit 9 of XR10) to 1.

●

In 100BASE-TX internal loop-back operation, the data is routed from the transmit

output of NRZ-to-NRZI converter and looped back to the receive input of NRZI-to-NRZ

converter.

In 100BASE-TX remote loop-back operation, data is received from RX± pins and

passed through the receive path to the output of the data and clock recovery section,

and then looped back to the input of the NRZI-to-MLT3 converter and out to the

medium via the transmit line drivers.

In 10BASE-T loop-back operation, the data is passed through the transmit path to the

output of the Manchester encoder and then looped back into the input of the phase lock

loop circuit in the receive path.

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