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/%. , Loopback When High, forces internal loopback. Disables collision and

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7(1 , Transmit Enable Enables data transmission and starts the watchdog

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7&/. 2 Transmit Clock A 10 MHz clock output. This clock signal should be

directly connected to the transmit clock input of the controller.

7;' , Transmit Data Input signal containing NRZ data to be transmitted on the

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the controller. Pulled Low internally.

&2/ 2 Collision Signal Output that drives the collision detect input of the con-

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is pulled Low during receive. Pulled High internally.

/('/ 2 LED Link Open drain driver for link integrity indicator. Output is pulled

Low during link test pass. Pulled High internally.

&' 2 Carrier Detect An output for notifying the controller that activity exists

on the network.

5&/. 2 Receive Clock A recovered 10 MHz clock which is synchronous to the

received data and connected to the controller receive clock input.

5;' 2 Receive Data Output signal connected directly to the receive data input

of the controller.

/, , Link Enable Controls link integrity test; enabled when LI is High, dis-

abled when LI is Low.

5%,$6 , Bias Circuitry A 7.5 k 1% resistor to ground at this pin controls operat-

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'64( , SQE Disable When DSQE is High, the SQE function is disabled.

When DSQE is Low, the SQE function is enabled. SQE should be dis-

abled for normal operation in Hub/Switch/Repeater applications. Pulled

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mode in accordance with Table 2. Pulled Low internally.

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