CX28331 datasheet(17/68 Pages) CONEXANT

17 / 68 page

CX28331/CX28332/CX28333

1.0 Pin Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

1.1 Pin Assignments

100985A

Conexant

1-7

——

TCLK

Transmit clock Ch1

Transmit bit clock input for strobing

with transmit data into the CX2833i.

—

TCLK1

—

TCLK2

Transmit clock Ch2

——

TCLK3

Transmit clock Ch3

——

RLOS

Loss of signal Ch1

Loss Of Signal (LOS) indication for

each channel, as determined by

insufficient pulse density. Signal

loss detected when RLOS = 1. An

LOS will be asserted when 175 ±75

0s occur in a row and deasserted

when the pulse density is between

28% and 33% (DS3/STS-1) (i.e., a

1s density).

—

RLOS1

—

RLOS2

Loss of signal Ch2

——

RLOS3

Loss of signal Ch3

Control Signals

ENDECDIS

Encoder/decoder

disable (for all channels)

1 = Dual rail pulse coded data

format. Input transmit data pins

TPOS, TNRZ, TNEG and NC are

interpreted as TPOS and TNEG

(encoded positive and negative rail

data). Output receive data pins

RPOS and RNRZ, and RNEG and

RLCV are interpreted as RPOS and

RNEG, with RPOS having a positive

pulse in place of every positive AMI

pulse and RNEG having a negative

pulse in place of every negative AMI

pulse.

0 = NRZ format. Transmit data pins

TPOS and TNEG are interpreted as

TNRZ and NC (not connected).

Receive data pins RPOS and RNEG

are interpreted as RNRZ and RLCV.

In this mode, all line code violations

are reported as active high on

RLCV.

——

TAIS

Transmit Ch1 AIS mode

enable

Transmission of Alarm Indication

Signal (AIS) for a given channel.

Replace transmit data with AIS

signal. The AMI form of AIS

supported is alternating 1s.

(+1, -1, +1, -1, +1, ...)

Looping takes precedence over AIS.

1 = AIS mode enabled

0 = AIS mode disabled

—

TAIS1

—

TAIS2

Transmit Ch2 AIS mode

enable

——

TAIS3

Transmit Ch3 AIS mode

enable

Table 1-1. CX2833i-1x Pin Definitions (3 of 6)

Pin #

Signal Name

Description

I/O/P

Notes

CX28331-1x CX28332-1x CX28333-1x

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