XRT83SL34 datasheet(10/80 Pages) EXAR

10 / 80 page

XRT83SL34

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

REV. P1.0.8

PRELIMINARY

TCLK_0

TCLK_1

TCLK_2

TCLK_3

128

103

102

Transmitter Clock Input for Channel _0 - Host mode and Hardware mode

E1 rate at 2.048MHz ± 50ppm. T1 rate at 1.544MHz ± 32ppm.

During normal operation TCLK_0 is used for sampling input data at TPOS_0/

TDATA_0 and TNEG_0/CODES_0 while MCLK is used as the timing refer-

ence for the transmit pulse shaping circuit.

Transmitter Clock Input for Channel _1

Transmitter Clock Input for Channel _2

Transmitter Clock Input for Channel _3

NOTE: Internally pulled “Low” with a 50k

Ω resistor for all channels.

TAOS_0

TAOS_1

TAOS_2

TAOS_3

WR_R/W

RD_DS

ALE_AS

Transmit All Ones for Channel _0 - Hardware mode

Setting this pin "High" enables the transmission of an “All Ones” Pattern from

Channel _0. A "Low" level stops the transmission of the “All Ones” Pattern.

Transmit All Ones for Channel _1

Transmit All Ones for Channel _2

Transmit All Ones for Channel _3

Host mode: these pins act as various microprocessor functions. See “Micro-

processor Interface” on page 8.

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

Ω resistor.

TXON_0

TXON_1

TXON_2

TXON_3

122

123

124

125

Transmitter Turn On for Channel _0

Hardware mode

Setting this pin "High" turns on the Transmit Section of Channel _0 and has no

control of the Channel_0 receiver. When TXON_0 = “0” then TTIP_0 and

TRING_0 driver outputs will be tri-stated.

NOTE: In Hardware mode only, all receiver channels will be turned on upon

power-up and there is no provision to power them off. The receive

channels can only be independently powered on or off in Host mode.

In Host mode

The TXON_n bits in the channel control registers turn each channel Transmit

section ON or OFF. However, control of the transmit on/off function can be

transferred to the Hardware pins by setting the TXONCTL bit (bit 6) to “1” in

the register at address hex 0x42.

Transmitter Turn On for Channel _1

Transmitter Turn On for Channel _2

Transmitter Turn On for Channel _3

NOTE: Internally pulled "Low" with a 50k

Ω resistor for all channels.

SIGNAL NAME

PIN #TYPE

DESCRIPTION

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