CX28331 datasheet(26/68 Pages) CONEXANT

26 / 68 page

1.0 Pin Description

CX28331/CX28332/CX28333

1.1 Pin Assignments

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

1-16

Conexant

100985A

——

TPOS/

TNRZ

Ch1 transmit

Positive rail or

NRZ data

Synchronized transmit data intended to be

strobed in by the corresponding TCLK.

When ENDECDIS = 1, these inputs are

expected to be positive and negative AMI

data (TPOS and TNEG).

When ENDECDIS = 0, these inputs are

expected to be uncoded NRZ data (TNRZ)

and no connects (NC).

See notes on the ENDECDIS pin in the

Control Signal section.

—

TPOS1/

TNRZ1

——

TNEG/

Ch1 transmit

Negative rail or

no connect data

—

TNEG1/

NC1

—

TPOS2/

TNRZ2

Ch2 transmit

Positive or NRZ

data

—

TNEG2/

NC2

Ch2 transmit

Negative data or

no connect data

——

TPOS3/

TNRZ3

Ch3 transmit

Positive or NRZ

data

——

TNEG3/NC3

Ch3 transmit

Negative data or

no connect data

——

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

Table 1-2. CX2833i-3x Pin Definitions (3 of 8)

Pin #

Signal Name

Description

I/O/P

Notes

CX28331-3x CX28332-3x CX28333-3x

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