XRT75R03 datasheet(21/92 Pages) EXAR

21 / 92 page

XRT75R03

THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR

REV. 1.0.7

GENERAL CONTROL PINS

PIN #

SIGNAL NAME

TYPE

DESCRIPTION

SR/DR

Single-Rail/Dual-Rail Select Input - Chip Level

This input pin is used to configure the XRT75R03 to operate in either the Single-

Rail or Dual-Rail Mode.

If the XRT75R03 is configured to operate in the Single-Rail Mode, then all of the

following will happen.

• All of the B3ZS/HDB3 Encoder and Decoder blocks in the XRT75R03 will be

enabled.

• The Transmit Section of each channel will accept all of the outbound data

from the System-side Equipment via the TPDATA_n (or TxDATA_n) input pin.

• The Receive Section of each channel will output all of the recovered data to

the System-side Equipment via the RPOS output pin.

• Each of the RNEG/LCV output pins will now function as the LCV (Line Code

Violation or Excessive Zero Event) indicator output pin.

If the user configures the device to operate in the Dual-Rail Mode, then all of the

following will happen.

• All of the B3ZS/HDB3 Encoder and Decoder blocks in the XRT75R03 will be

disabled.·

• The Transmit Section of each channel will accept positive-polarity data via the

TPDATA_n input pin, and negative-polarity data via the TNDATA_n input pin.

• The Receive Section of each channel will pulse the RPOS_n output pin "High"

for one period of RCLK_n for each time a positive-polarity pulse is received via

the RTIP_n/RRING_n input pins

• Likewise, the Receive Section of each channel will also pulse the RNEG_n

output pin "High" for one period of RCLK_n for each time a negative-polarity

pulse is received via the RTIP_n/RRING_n input pins.

"Low" - Configures the XRT75R03 device to operate in the Dual-Rail Mode.

"High" - Configures the XRT75R03 device to operate in the Single-Rail Mode.

NOTES:

This input pin is ignored and should be tied to GND if the XRT75R03

has been configured to operate in the Host Mode.

This pin is internally pulled "Low".

E3_0

E3_1

E3_2

E3 Mode Select Input - Channel 0

E3 Mode Select Input - Channel1

E3 Mode Select Input - Channel 2

This input pin, along with the corresponding STS-1/DS3_n input pin is used the

to configure a given channel within the XRT75R03 into either the DS3, E3 or

STS-1 Modes.

"High" - Configures the corresponding channel to operate in the E3 Mode.

"Low" - Configures the corresponding channel to operate in either the DS3 or

STS-1 Modes, depending upon the setting of the corresponding STS-1/DS3_n

input pin.

NOTES:

This input pin is ignored and should be tied to GND if the XRT75R03

has been configured to operate in the Host Mode.

This input pin is internally pulled low.

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