DP83953 datasheet(8/90 Pages) NSC

8 / 90 page

2.0 Pin Descriptions (Continued)

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TT = TTL compatible, B = Bi-directional, C = CMOS compatible, OD = Open Drain, I = Input, O = Output,

Z = high impedance,

Pin Name

Pin No.

Driver

Type

I/O

Description

Inter-RIC Bus Pins

ACKI

ACKNOWLEDGE INPUT: Input to the network ports' arbitration

chain.

ACKO

ACKNOWLEDGE OUTPUT: Output from the network ports' arbi-

tration chain.

IRD

B,Z

INTER-RIC DATA: When asserted as an output this signal pro-

vides a serial data stream in NRZ format. The signal is asserted by

a RIC2A when it is receiving data from one of its network seg-

ments. The default condition of this signal is to be an input. In this

state it may be driven by other devices on the Inter-RIC bus.

IRE

B,Z

INTER-RIC ENABLE: When asserted as an output this signal pro-

vides an activity framing enable for the serial data stream. The sig-

nal is asserted by a RIC2A when it is receiving data from one of its

network segments. The default condition of this signal is to be an

input. In this state it may be driven by other devices on the Inter-

RIC bus.

IRC

B,Z

INTER-RIC CLOCK: When asserted as an output this signal pro-

vides a clock signal for the serial data stream. Data (IRD) is

changed on the falling edge of the clock. The signal is asserted by

a RIC2A when it is receiving data from one of its network seg-

ments. The default condition of this signal is to be an input. When

an input, IRD is sampled on the rising edge of the clock. In this

state it may be driven by other devices on the Inter-RIC bus.

COLN

B,Z

COLLISION ON PORT N: This denotes that a collision is occurring

on the port receiving the data packet. The default condition of this

signal is to be an input. In this state it may be driven by other de-

vices on the Inter-RIC bus.

PKEN

PACKET ENABLE: This output acts as an active high enable for

an external bus transceiver (if required) for the IRE, IRC IRD and

COLN signals. When high the bus transceiver should be transmit-

ting on to the bus, i.e. this RIC2A is driving the IRD, IRE, IRC, and

COLN bus lines. When low the bus transceiver should receive from

the bus.

CLKIN

100

40 MHz CLOCK INPUT: This input is used to generate the

RIC2A's timing reference for the state machines, and phase lock

loop decoder.

ACTND

ACTIVITY ON PORT N DRIVE: This output is active when the

RIC2A is receiving data or collision information from one of its net-

work segments.

ACTNS

ACTIVITY ON PORT N SENSE: This input senses when this or an-

other RIC2A in a multi-RIC2A system is receiving data or collision

information.

ANYXND

ACTIVITY ON ANY PORT EXCLUDING PORT N DRIVE: This

output is active when a RIC2A is experiencing a transmit collision

or multiple ports have active collisions on their network segments.

ANYXNS

ACTIVITY ON ANY PORT EXCLUDING PORT N SENSE: This in-

put senses when this RIC2A or other RIC2As in a multi-RIC2A sys-

tem are experiencing transmit collisions or multiple ports have

active collisions on their network segments.

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