XRT83SL314 datasheet(11/83 Pages) EXAR

11 / 83 page

XRT83SL314

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

REV. 1.0.1

TRANSMITTER SECTION

NAME

TYPE

DESCRIPTION

TxON

AC20

Transmit On/Off Input

Upon power up, the transmitters are powered off. Turning the transmitters On

or Off is selected through the microprocessor interface by programming the

appropriate channel register if this pin is pulled "High". If the TxON pin is

pulled "Low", all 14 transmitters are powered off.

NOTE:

TxON is ideal for redundancy applications.

See the Redundancy

Applications Section of this datasheet for more details.

Internally

pulled "Low" with a 50K

Ω resistor.

DMO

Digital Monitor Output (Global Pin for All 14-Channels)

When no transmit output pulse is detected for more than 128 TCLK cycles on

one of the 14-channels, the DMO pin will go "High" for a minimum of one TCLK

cycle. DMO will remain "High" until the transmitter sends a valid pulse.

NOTE: This pin is for redundancy applications to initiate an automatic switch to

the backup card. For individual channel DMO, see the register map.

TCLK13

TCLK12

TCLK11

TCLK10

TCLK9

TCLK8

TCLK7

TCLK6

TCLK5

TCLK4

TCLK3

TCLK2

TCLK1

TCLK0

Y16

Y17

AC18

D16

C17

A19

B16

AC6

AC5

AC7

Transmit Clock Input

TCLK is the input facility clock used to sample the incoming TPOS/TNEG data.

If TCLK is absent, pulled "Low", or pulled "High", the transmitter outputs at

TTIP/TRING can be selected to send an all ones or an all zero signal by pro-

gramming TCLKCNL in the appropriate global register. TPOS/TNEG data can

be sampled on either edge of TCLK selected by TCLKE in the appropriate glo-

bal register.

NOTE: TCLKE is a global setting that applies to all 14 channels.

TPOS13

TPOS12

TPOS11

TPOS10

TPOS9

TPOS8

TPOS7

TPOS6

TPOS5

TPOS4

TPOS3

TPOS2

TPOS1

TPOS0

AB17

AA18

AB18

A18

D17

B19

A17

AB6

AA6

TPOS/TDATA Input

Transmit digital input pin. In dual rail mode, this pin is the transmit positive

data input. In single rail mode, this pin is the transmit non-return to zero (NRZ)

data input.

NOTE: Internally pulled "Low" with a 50K

Ω resistor.

XRT83SL314 Datasheet(PDF) 11 Page - Exar Corporation

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