XRT83L34 datasheet(21/99 Pages) EXAR

21 / 99 page

XRT83L34

QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR REV. 1.0.1

A[6]

A[5]

A[4]

A[3]

A[2]

A[1]

A[0]

JASEL1

JASEL0

EQC4

EQC3

EQC2

EQC1

EQC0

Address Bus Input Pins/Jitter Attenuator Select Input Pins/Equalizer

Control Input pins:

The exact function of these input pins depends upon whether the XRT83L34

device has been configured to operate in the HOST or Hardware Mode, as

described below.

HOST Mode Operation - Address Bus Input Pins - A[6:0]:

These pins permits the Microprocessor to identity on-chip registers (within

the XRT83L34 device0 whenever it performs READ and WRITE operations

with the XRT83L34 device.

Microprocessor Interface Address Bus[6]

Microprocessor Interface Address Bus[5]

Microprocessor Interface Address Bus[4]

Microprocessor Interface Address Bus[3]

Microprocessor Interface Address Bus[2]

Microprocessor Interface Address Bus[1]

Microprocessor Interface Address Bus[0]

Jitter Attenuator Select Pins - Hardware Mode

Jitter Attenuator select pin 1

Jitter Attenuator select pin 0

See “Jitter Attenuator” on page 19.

Equalizer Control Pins - Hardware Mode

Equalizer Control Input pin 4

Equalizer Control Input pin 3

Equalizer Control Input pin 2

Equalizer Control Input pin 1

Equalizer Control Input pin 0

Pins EQC[4:0] select the Receive Equalizer and Transmitter Line Build Out.

See “Alarm Function//Redundancy Support” on page 21.

NOTE: Internally pulled “Low” with a 50k

Ω resistor.

INT

TRATIO

119

Interrupt Output - Host Mode

This pin goes “Low” to indicate an alarm condition has occurred within the

device. Interrupt generation can be globally disabled by setting the GIE bit to

"0" in the command control register.

Transmitter Transformer Ratio Select - Hardware mode

The function of this pin is to select the transmitter transformer ratio.

See

“Alarm Function//Redundancy Support” on page 21.

NOTE: This pin is an open drain output and requires an external 10k

Ω pull-

up resistor.

SIGNAL NAME

PIN #TYPE

DESCRIPTION

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