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Advanced 10/100 Repeater with Integrated Management — LXT9860/9880

Datasheet

Document #: 248987

Revision#: 003

Rev Date: 08/07/01

Table 4.

MII #2 Signal Descriptions

Symbol

Type

1, 2

Description

MII2_SPD

Speed Select - MII 2. 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.

205

206

207

208

MII2_RXD0

MII2_RXD1

MII2_RXD2

MII2_RXD3

Receive Data - MII 2. The LXT98x0 transmits received data to

the controller on these outputs. Data is driven on the falling edge

of MII2_RXCLK.

204

MII2_RXDV

Receive Data Valid - MII 2. Active High signal, synchronous to

MII2_RXCLK, indicates valid data on MII2_RXD<3:0>.

203

MII2_RXCLK

Receive Clock - MII 2. MII receive clock for expansion port. This

is a 2.5 or 25 MHz clock derived from the CLK25 input (refer to

Table 11 on page 30).

202

MII2_RXER

Receive Error - MII 2. Active High signal, synchronous to

MII2_RXCLK, indicates invalid data on MII2_RXD<3:0>.

197

MII2_TXER

Transmit Error - MII 2. MII2_TXER is a 100 Mbps-only signal.

The MAC asserts this input when errors occurs in the transmit

data stream. The LXT98x0 sends ‘Invalid Code Symbols’ on the

line.

196

MII2_TXCLK

Transmit Clock - MII 2. This is a 2.5 or 25 MHz clock derived

from the CLK25 input (refer to Table 11 on page 30).

195

MII2_TXEN

Transmit Enable - MII 2. External controllers drive this input High

to indicate data is transmitted on the MII2_TXD<3:0> pins.

Ground this input if unused.

194

193

192

191

MII2_TXD0

MII2_TXD1

MII2_TXD2

MII2_TXD3

Transmit Data - MII 2. External controllers use these inputs to

transmit data to the LXT98x0. The LXT98x0 samples

MII2_TXD<3:0> on the rising edge of MII2_TXCLK, when

MII2_TXEN is High.

188

MII2_COL

Collision - MII 2. The LXT98x0 drives this signal High to indicate

a collision occurred.

187

MII2_CRS

Carrier Sense - MII 2. Active High signal indicates LXT98x0 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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