LXT9782 datasheet(13/78 Pages) INTEL

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Fast Ethernet 10/100 Multi-Port Transceiver with Serial MII — LXT9762/9782

Datasheet

Table 1.

LXT97x2 Serial MII Signal Descriptions

9762

Pin#

9782 Pin#

Symbol

Type1

Signal Description2, 3

PQFP

PBGA

Serial MII Data Interface Pins

TXD0

Transmit Data - Ports 0-7. These serial input streams provide data to be

transmitted to the network. LXT97x2 clocks the data in synchronously to

REFCLK.

TXD1

TXD2

TXD3

822

TXD4

317

TXD5

–

8D4

TXD6

–

3C2

TXD7

RXD0

Receive Data - Ports 0-7. These serial output streams provide data

received from the network. LXT97x2 drives the data out synchronously to

REFCLK.

RXD1

RXD2

RXD3

923

RXD4

418

RXD5

–

9E2

RXD6

–

4C3

RXD7

W14

SYNC

SMII Synchronization. The MAC must generate a SYNC pulse every 10

REFCLK cycles to synchronize the SMII.

Y15

REFCLK

Reference Clock. The LXT97x2 requires a 125 MHz SMII reference clock

input at this pin. Refer to Functional Description for detailed clock

requirements.

MII Control Interface Pins 3

MDIO

I/O

Management Data Input/Output. Bidirectional serial data channel for

communication between the PHY and MAC or switch ASIC.

U12

MDINT

Management Data Interrupt. When bit 18.1 = 1, an active Low output on

this pin indicates status change.

MDC

Management Data Clock. Clock for the MDIO serial data channel.

Maximum frequency is 8 MHz.

Y12

MDDIS

Management Disable. When MDDIS is High, the MDIO is disabled from

read and write operations.

When MDDIS is Low at power up or reset, the Hardware Control Interface

pins control only the initial or “default” values of their respective register

bits. After the power-up/reset cycle is complete, bit control reverts to the

MDIO serial channel.

1. Type Column Coding: I = Input, O = Output, OD = Open Drain.

2. Ports 6 and 7 are available only on the LXT9782. These pins are not bonded out on the LXT9762.

3. The LXT97x2 supports the 802.3 MDIO register set. Specific bits in the registers are referenced using an “X.Y” notation,

where X is the register number (0-32) and Y is the bit number (0-15).

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