XRT83SL34 datasheet(54/80 Pages) EXAR

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XRT83SL34

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

REV. P1.0.8

PRELIMINARY

RXRES1_n

Receive External Resistor Control Pin 1: In Host mode, this bit

along with the RXRES0_n bit selects the value of the external

Receive fixed resistor according to the following table;

R/W

RXRES0_n

Receive External Resistor Control Pin 0: For function of this

bit see description of D4 the RXRES1_n bit.

R/W

INSBPV_n

Insert Bipolar Violation: When this bit transitions from “0” to

“1”, a bipolar violation is inserted in the transmitted data

stream of the selected channel number n. Bipolar violation can

be inserted either in the QRSS pattern, or input data when

operating in single-rail mode. The state of this bit is sampled

on the rising edge of the respective TCLK_n.

NOTE:

To ensure the insertion of a bipolar violation, a “0”

should be written in this bit location before writing a

“1”.

R/W

INSBER_n

Insert Bit Error: With TDQRSS enabled, when this bit transi-

tions from “0” to “1”, a bit error will be inserted in the transmit-

ted QRSS pattern of the selected channel number n. The state

of this bit is sampled on the rising edge of the respective

TCLK_n.

NOTE: To ensure the insertion of bit error, a “0” should be

written in this bit location before writing a “1”.

R/W

TRATIO_n

Transformer Ratio Select: In the external termination mode,

writing a “1” to this bit selects a transformer ratio of 1:2 for the

transmitter. Writing a “0” sets the transmitter 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

bit has no effect.

R/W

TABLE 22: MICROPROCESSOR REGISTER #3, BIT DESCRIPTION

RXRE S1_n

R equired Fixed E xternal

RX Resistor

N o external Fixed

R esistor

240

Ω

RXRE S0_n

210

Ω

150

Ω

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