XRT83SL34 datasheet(17/80 Pages) EXAR

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XRT83SL34

QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

PRELIMINARY

REV. P1.0.8

TRATIO

INT

119

Transmitter Transformer Ratio Select - Hardware Mode

In external termination mode (TXSEL = 0), setting this pin "High" selects a

transformer ratio of 1:2 for the transmitter. A "Low" on this pin sets the trans-

mitter transformer ratio to 1:2.45. In the internal termination mode the

transmitter transformer ratio is permanently set to 1:2 and the state of this pin

is ignored.

Interrupt Output - Host Mode

This pin is asserted “Low” to indicate an alarm condition. See “Microproces-

sor Interface” on page 8.

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

Ω pull-

up resistor.

RESET

121

Hardware Reset (Active "Low")

When this pin is tied “Low” for more than 10µs, the device is put in the reset

state.

Pulling RESET and ICT pins “Low” simultaneously will put the chip in factory

test mode. This condition should not be permitted during normal operation.

NOTE: Internally pulled “High” with a 50k

Ω resistor.

SR/DR

Single-Rail/Dual-Rail Data Format

Connect this pin "Low" to select transmit and receive data format in Dual-rail

mode. In this mode, HDB3 or B8ZS encoder and decoder are not available.

Connect this pin "High" to select single-rail data format.

NOTE: Internally pulled "Low" with a 50k

Ω resistor.

LOOP1_0

LOOP0_0

LOOP1_1

LOOP0_1

LOOP1_2

LOOP0_2

LOOP1_3

LOOP0_3

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

I/O

Loop-Back Control Pins - Hardware Mode:

Loop-back control pin 1 - Channel _0

Loop-back control pin 0 - Channel _0

Loop-back control pin 1 - Channel _1

Loop-back control pin 0 - Channel _1

Loop-back control pin 1 - Channel _2

Loop-back control pin 0 - Channel _2

Loop-back control pin 1 - Channel _3

Loop-back control pin 0 - Channel _3

Microprocessor R/W Data bits [7:0] - Host Mode

These pins are microprocessor data bus pins. See “Microprocessor Read/

Write Data Bus Pins - Host Mode” on page 9.

NOTE: These pins are internally pulled “Low” with a 50k

Ω resistor.

SIGNAL NAME

PIN #TYPE

DESCRIPTION

LOOP1_n

LOOP0_n

MODE

Normal Mode No Loop-back Channel_n

Local Loop-Back Channel_n

Remote Loop-Back Channel_n

Digital Loop-Back Channel_n

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