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

Datasheet

Document #: 248987

Revision#: 003

Rev Date: 08/07/01

IR100DAT0

IR100DAT1

IR100DAT2

IR100DAT3

IR100DAT4

I/O

Tri-state

Schmitt

100 Mbps IRB Data. These bidirectional signals carry 5-bit data

on the 100 Mbps IRB. Data is driven on the falling edge and

sampled on the rising edge of IR100CLK. Buffer these signals

between boards.

IR100CLK

I/O

Tri-state

Schmitt

100 Mbps IRB Clock. This bidirectional, non-continuous, 25 MHz

clock is recovered from received network traffic. Schmitt triggering

is used to increase noise immunity. This signal must be pulled to

VCC when idle. One 1 k

Ω pull-up resistor on both sides of a

74LVT245 buffer is recommended.

IR100ISO

100 Mbps Stack Backplane Isolate. This output allows one

LXT98x0 per board the ability to enable or disable an external

bidirectional transceiver (74LVT245). Attach the output to the

Enable input of the 74LVT245. The output is driven High (disable)

to isolate the 100 Mbps IRB.

10 Mbps IRB Signals

IR10DAT

I/O

10 Mbps IRB Data. This bidirectional signal carries data on the

10 Mbps IRB. Data is driven and sampled on the rising edge of

the corresponding IRCLK. This signal must be pulled High by a

330

Ω resistor. Buffer this signal between boards.

IR10CLK

I/O

Tri-state

Schmitt

10 Mbps10 Mbps IRB Clock. This bidirectional, non-continuous,

10 MHz clock is recovered from received network traffic. During

idle periods, the output is high-impedance. Schmitt triggering is

used to increase noise immunity.

IR10DEN

10 Mbps IRB Driver Enable. This output provides directional

control for an external bidirectional transceiver (74LVT245) used

to buffer the IRBs in multi-board applications. It must be pulled up

by a 330

Ω resistor. When there are multiple devices on one

board, tie all IR10DEN outputs together. If IR10DEN is tied

directly to the DIR pin on a 74LVT245, attach the on-board

IR10DAT, IR10CLK and IR10ENA signals to the “B” side of the

74LVT245, and connect the off-board signals to the “A” side of the

74LVT245.

IR10ENA

I/O

10 Mbps IRB Enable. This active Low output indicates carrier

presence on the IRB. A 330

Ω pull-up resistor is required to pull

the IR10ENA output High when the IRB is idle. When there are

multiple devices, tie all IR10ENA outputs together. Buffer these

signals between boards.

IR10COL

I/O

10 Mbps IRB Collision. This output is driven Low to indicate a

collision occurred on the 10 Mbps segment. A 330

Ω resistor is

required on each board to pull this signal High when there is no

collision. Do not connect between boards and do not buffer.

Table 5.

Inter-Repeater Backplane Signal Descriptions (Continued)

Symbol

Type

1, 2

Description

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

OD = Open Drain, OS = Open Source, PD = Pull Down, PU = Pull Up. Even if the IRB is not used, required

pull-up resistors must be installed as listed above.

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

2. Pins are 5V tolerant, unless indicated.

3. IR100CFS is not 5V tolerant.

4. IR10CFS is not 5V tolerant.

9880 Datasheet(PDF) 23 Page - Intel Corporation

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