KSZ9567RTXI datasheet(20/232 Pages) MICROCHIP

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KSZ9567R

DS00002329D-page 20

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Transmitted data is scrambled through the use of an 11-bit wide linear feedback shift register (LFSR). The scrambler

generates a 2047-bit non-repetitive sequence. Then the receiver de-scrambles the incoming data stream using the

same sequence as at the transmitter.

4.1.3

10BASE-Te TRANSCEIVER

10BASE-Te is an energy-efficient version of 10BASE-T which is powered from a 2.5V supply. It has a reduced transmit

signal amplitude and requires Cat5 cable. It is inter-operable to 100m with 10BASE-T when Cat5 cable is used.

4.1.3.1

10BASE-Te Transmit

The 10BASE-Te driver is incorporated with the 100BASE-TX driver to allow for transmission using the same magnetics.

They are internally wave-shaped and pre-emphasized into outputs with typical 1.75V amplitude (compared to the typical

transmit amplitude of 2.5V for 10BASE-T). The harmonic contents are at least 27dB below the fundamental frequency

when driven by an all-ones Manchester-encoded signal.

4.1.3.2

10BASE-Te Receive

On the receive side, input buffers and level detecting squelch circuits are employed. A differential input receiver circuit

and a phase-locked loop (PLL) perform the decoding function.

The Manchester-encoded data stream is separated into clock signal and NRZ data. A squelch circuit rejects signals with

levels less than 400mV or with short pulse widths to prevent noise at the RXP1 or RXM1 input from falsely triggering

the decoder. When the input exceeds the squelch limit, the PLL locks onto the incoming signal and the device decodes

a data frame. The receiver clock is maintained active during idle periods in between data reception.

4.1.4

AUTO MDI/MDI-X

The automatic MDI/MDI-X feature, also known as auto crossover, eliminates the need to determine whether to use a

straight cable or a crossover cable between the device and its link partner. The auto-sense function detects the MDI/

MDI-X pair mapping from the link partner, and assigns the MDI/MDI-X pair mapping of the device accordingly. Table 4-

1 shows the device’s 10/100/1000 Mbps pin configuration assignments for MDI and MDI-X pin mapping.

Auto MDI/MDI-X is enabled by default. It can be disabled through the port control registers. If Auto MDI/MDI-X is dis-

abled, the port control register can also be used to select between MDI and MDI-X settings.

An isolation transformer with symmetrical transmit and receive data paths is recommended to support Auto MDI/MDI-X.

4.1.5

PAIR-SWAP, ALIGNMENT, AND POLARITY CHECK

In 1000Base-T mode, the device:

• Detects incorrect channel order and automatically restores the pair order for the A and B pairs. This is also done

separately for the C and D pairs. Crossing of A or B pairs to C or D pairs is not corrected.

• Supports 50±10ns difference in propagation delay between pairs of channels in accordance with the IEEE 802.3

standard, and automatically corrects the data skew so the corrected four pairs of data symbols are synchronized.

Incorrect pair polarities of the differential signals are automatically corrected for all speeds.

4.1.6

WAVE SHAPING, SLEW-RATE CONTROL, AND PARTIAL RESPONSE

In communication systems, signal transmission encoding methods are used to provide the noise-shaping feature and

to minimize distortion and error in the transmission channel.

• For 1000BASE-T, a special partial-response signaling method is used to provide the bandwidth-limiting feature for

TABLE 4-1:

MDI/MDI-X PIN DEFINITIONS

Pin (RJ45 pair)

MDI

MDI-X

1000BASE-T 100BASE-TX

10BASE-Te

1000BASE-T 100BASE-TX

10BASE-Te

TXRXxP/M_A (1,2)

A+/-TX+/-

TX+/-B+/-

RX+/-

TXRXxP/M_B (3,6)

B+/-

RX+/-

A+/-

TX+/-

TXRXxP/M_C (4,5)

C+/-

Not used

D+/-

Not used

TXRXxP/M_D (7,8)

D+/-

Not used

C+/-

Not used

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