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W89C92

TRANSCEIVER FOR COAXIAL CABLE (TCC)

Winbond 

W89C92

FUNCTIONAL DESCRIPTION

Transmit Function

The W89C92 transmits data received from the DTE onto the coaxial cable in a current format. The

signal current is sunk from the coaxial cable. The internal current control switch responds to the

activity of the DTE (DO+/DO-) output data. DTE differential output signals meeting the squelch

threshold will be decoded into digital signals without logical inversion to control the internal current

switch. The transmitter output is pulled up to VDD when the current sink source is turned off.

Receive Function

The W89C92 translates signals on the coaxial cable into differential signal format and sends the data

to the DTE. The AC component of the coaxial cable signal carries the data message and is converted

into a digital signal format. The differential pair driver (DI+/DI-) then sends a differential signal

corresponding to the AC signal on the coaxial cable. The receiver of the W89C92 receives the signal

on the coaxial cable regardless of whether the signal is sent by the W89C92 itself or by another MAU.

The receiver of the W89C92 performs a loopback function when the W89C92 is transmitting.

Jabber Lockup Function

The W89C92 will inhibit its transmitter when the transmitter is activated for a time longer than the

jabber activation delay. Excessively long packets sent from the DTE cannot be sent out completely if

the packet length exceeds the jabber activation delay. The jabber lockup function protects the

network segment from a malfunctioning station or invalid traffic requirements. The jabber lockup

function can be disabled for certain special applications, such as when an infinite data packet is to be

transmitted. In a 9V DC power system, the jabber lockup function may be disabled by setting the SQE

pin

to

between

-3.4V and -5.4V.

Collision Presence Function

A collision condition occurs when two or more stations are transmitting data at the same time. The

W89C92 detects collision conditions by monitoring the DC level of the signal on the coaxial cable. A

signal with a DC level lower than the collision threshold forces the W89C92 to send the collision

signal (a 10 MHz differential signal) on CSO+/CS0-. The collision detection scheme of the W89C92

meets the transmit mode requirements specified by the IEEE 802.3 10BASE2 MAU function. The

CSO+/CSO- differential pair driver is also active when the coaxial cable is disconnected.

SQE Test Function

The W89C92 implements the SQE test function by sending out a collision signal from CSO+/CSO-

for a short time CSO+/CSO- after the end of every transmission. The SQE test function can be

disabled to meet the IEEE 802.3 repeater unit requirements. The SQE test function remains enabled

when the jabber lockup function is disabled.

ABSOLUTE MAXIMUM RATINGS

SYMBOL

TA

TS

VSS

VIN

DESCRIPTION

Ambient temperature

Storage temperature

Supply voltage

Input voltage

MIN.

0

-65

-

0

TYP

-

-

-

-

MAX.

70

150

-12

-12

UNIT

°C

°C

V

V

Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the

device.

-4-

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