KSZ9031RNX 查看數據表（PDF） - Micrel

零件编号

产品描述 (功能)

生产厂家

KSZ9031RNX

Gigabit Ethernet Transceiver with RGMII Support

Micrel 

Micrel, Inc.

KSZ9031RNX

Functional Description: 10/100/1000 Transceiver Features

Auto MDI/MDI-X

The Automatic MDI/MDI-X feature eliminates the need to determine whether to use a straight cable or a crossover cable

between the KSZ9031RNX and its link partner. This auto-sense function detects the MDI/MDI-X pair mapping from the

link partner, and assigns the MDI/MDI-X pair mapping of the KSZ9031RNX accordingly.

Table 1 shows the KSZ9031RNX 10/100/1000 pin configuration assignments for MDI/MDI-X pin mapping.

Table 1. MDI/MDI-X Pin Mapping

Pin (RJ-45 pair)

1000Base-T

MDI

100Base-TX

10Base-T

1000Base-T

MDI-X

100Base-TX

10Base-T

TXRXP/M_A (1,2)

A+/–

TX+/–

TX+/–

B+/–

RX+/–

RX+/–

TXRXP/M_B (3,6)

B+/–

RX+/–

RX+/–

A+/–

TX+/–

TX+/–

TXRXP/M_C (4,5)

C+/–

Not used

Not used

D+/–

Not used

Not used

TXRXP/M_D (7,8)

D+/–

Not used

Not used

C+/–

Not used

Not used

Auto MDI/MDI-X is enabled by default. It is disabled by writing a one to Register 1Ch, Bit [6]. MDI and MDI-X mode is set

by Register 1Ch, Bit [7] if Auto MDI/MDI-X is disabled.

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

Pair-Swap, Alignment, and Polarity Check

In 1000Base-T mode, the KSZ9031RNX

• Detects incorrect channel order and automatically restores the pair order for the A, B, C, D pairs (four channels)

• 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.

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 band-limiting feature for the

transmission path.

• For 100Base-TX, a simple slew-rate control method is used to minimize EMI.

• For 10Base-T, pre-emphasis is used to extend the signal quality through the cable.

PLL Clock Synthesizer

The KSZ9031RNX generates 125MHz, 25MHz, and 10MHz clocks for system timing. Internal clocks are generated from

the external 25MHz crystal or reference clock.

May 14, 2015

19

Revision 2.2

Share Link: