XRT73L03 Datasheet, PDF (10/62 Pages) Exar Corporation – 3 CHANNEL E3/DS3/STS-1 LINE INTERFCE UNIT

XRT73L03 3 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
REV. P1.0.13
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PRELIMINARY
PIN DESCRIPTION
PIN #
41
42
43
44
45
46
SIGNAL NAME
RxDVDD3
HOST/(HW)
RxClk3
RNEG3
RPOS3
RxDGND3
TYPE
****
I
O
O
O
****
DESCRIPTION
Receive Digital 3.3V+ 5% VDD (for Receiver 3):
HOST/Hardware Mode Select:
This input pin is used to enable or disable the Microprocessor Serial Interface
(e.g., consisting of the SDI, SDO, SClk, and CS pins).
Setting this input pin "High" enables the Microprocessor Serial Interface (e.g.
configures the XRT73L03 to operate in the HOST Mode). In this mode, config-
ure the XRT73L03 via the Microprocessor Serial Interface. When the
XRT73L03 is operating in the HOST Mode, then it ignores the states of many
of the discrete input pins.
Setting this input pin "Low" disables the Microprocessor Serial Interface (e.g.,
configures the XRT73L03 to operate in the Hardware Mode). In this mode,
many of the external input control pins are functional.
Receive Clock Output pin - Channel 3:
This output pin is the Recovered Clock signal from the incoming line signal for
Channel 3. The receive section of Channel 3 outputs data via the RPOS3 and
RNEG3 output pins on the rising edge of this clock signal.
NOTE: The Receive Section of Channel 3 is configured to update the data on
the RPOS3 and RNEG3 output pins on the falling edge of RxClk3 by doing one
of the following:
a. Operating in the Hardware Mode
Pull the RxClkINV pin (pin 62) to "High".
b. Operating in the HOST Mode
Write a "1" into the RxClkINV bit-field of the Command Register.
Receive Negative Data Output - Channel 3:
This output pin pulses "High" whenever Channel 3 of the XRT73L03 has
received a Negative Polarity pulse in the incoming line signal at the RTIP3/
RRing3 inputs.
NOTE: If the Channel 3 B3ZS/HDB3 Decoder is enabled, then the zero sup-
pression patterns in the incoming line signal (such as: "00V", "000V", "B0V",
"B00V") is not reflected at this output.
Receive Positive Data Output - Channel 3:
This output pin pulses “High" whenever Channel 3 of the XRT73L03 has
received a Positive Polarity pulse in the incoming line signal at the RTIP3/
RRing3 inputs.
NOTE: If the Channel 3 B3ZS/HDB3 Decoder is enabled, then the zero sup-
pression patterns in the incoming line signal (such as: "00V", "000V", "B0V",
"B00V") is not reflected at this output.
Receive Digital GND - Channel 3:
7