DP83959 datasheet(10/38 Pages) NSC

10 / 38 page

4.0

Pin Descriptions (Continued)

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4.5

CLOCK INTERFACE

/ACTN

I/O (O.D.)

Activity on Port N: The LERIC8 asserts this signal when data or collision

information is received from one of its network segments. The LERIC8 senses

this signal when this or another LERIC8 in a multi-LERIC system is receiving

data or collision information. If the Inter-LERIC bus is not being used, this pin

should be left unconnected (it has an internal pull-up resistor of 3.5 k

Ω) or

pulled up to VCC via an external resistor. If the Inter-LERIC bus is to be used,

this signal should have an external 680

Ω pull-up resistor to ensure fast

de-assertion.

/ANYXN

I/O (O.D.)

Activity on Any Port Except Port N: The LERIC8 asserts this signal when a

transmit collision is experienced or multiple ports have active collisions on

their network segments. The LERIC8 senses this signal when this or another

LERIC8 in a multi-LERIC system is experiencing transmit collisions or multiple

ports have active collisions on their network segments. If the Inter-LERIC bus

is not being used, this pin should be left unconnected (it has an internal

pull-up resistor of 14 k

Ω) or pulled up to V

CC via an external resistor. If the

Inter-LERIC bus is to be used, this signal should have an external 680

Ω

pull-up resistor to ensure fast de-assertion.

Signal Name

Type

Pin #

Description

Signal Name

Type

Pin #

Description

X_IN

144

20 MHz Crystal Oscillator Input: This pin can be used to connect an

external 20MHz crystal (between X_IN and X_OUT) as shown in Figure 2, or

as an external TTL compatible 20MHz oscillator module input as shown in

Figure 3.

X_OUT

145

20 MHz Crystal Oscillator Output: This pin is used to connect to an external

20 MHz crystal (between X_IN and X_OUT) as shown in Figure 2. When

using an external 20 MHz crystal oscillator module connected to the X_IN

input, this pin should be left unconnected as shown in Figure 3.

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