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Advanced 10/100 Unmanaged Repeater — LXT9883/9863

Datasheet

Document #: 249115

Revision #: 003

Rev. Date: 08/07/01

Table 1.

MII #1 Signal Descriptions

Symbol

Type

1, 2

Description

MII1_SPD

Speed Select - MII 1. This signal is sensed at power up, hardware reset, and

software reset. Selects operating speed of the respective MII (MAC) interface.

High = 100 Mbps. Low = 10 Mbps.

MII1_RXD0

MII1_RXD1

MII1_RXD2

MII1_RXD3

Receive Data - MII 1. The LXT98x3 transmits received data to the controller on these

outputs. Data is driven on the falling edge of MII1_RXCLK.

MII1_RXDV

Receive Data Valid - MII 1. Active High signal, synchronous to MII1_RXCLK,

indicates valid data on MII1_RXD<3:0>.

MII1_RXCLK

Receive Clock - MII 1. MII receive clock for expansion port. This is a 2.5 or 25 MHz

clock derived from the CLK25 input (refer to Table 7 on page 16).

MII1_RXER

Receive Error - MII 1. Active High signal, synchronous to MII1_RXCLK, indicates

invalid data on MII1_RXD<3:0>.

MII1_TXER

Transmit Error - MII 1. MII1_TXER is a 100M-only signal. The MAC asserts this

input when an error has occurred in the transmit data stream. The LXT98x3 responds

by sending ‘Invalid Code Symbols’ on the line.

MII1_TXCLK

Transmit Clock - MII 1. This is a 2.5 or 25 MHz clock derived from the CLK25 input

(refer to Table 7 on page 16).

MII1_TXEN

Transmit Enable - MII 1. External controllers drive this input High to indicate data is

transmitted on the MII1_TXD<3:0> pins. Ground this input if unused.

MII1_TXD0

MII1_TXD1

MII1_TXD2

MII1_TXD3

Transmit Data - MII 1. External controllers use these inputs to transmit data to the

LXT98x3. The LXT98x3 samples MII1_TXD<3:0> on the rising edge of MII1_TXCLK,

when MII1_TXEN is High.

MII1_COL

Collision - MII 1. The LXT98x3 drives this signal High to indicate a collision

occurred.

MII1_CRS

Carrier Sense - MII 1. Active High signal indicates LXT98x3 is transmitting or

receiving.

1. I = Input, O = Output, I/O = Input/Output, D = Digital, A = Analog, AI = Analog Input, A I/O = Analog Input/Output, OD = Open

Drain,

OS = Open Source, PD = Pull Down, PU = Pull Up.

NC = No Clamp. Pad does not clamp input in the absence of power.

2. Pins are 5V tolerant, unless indicated.

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