XRT73LC03A Datasheet, PDF (8/61 Pages) Exar Corporation – 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT

XRT73LC03A
3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
RECEIVE INTERFACE
PIN #
NAME
49
RxClk_0
111
RxClk_1
43
RxClk_2
50
RNEG_0
110
RNEG_1
44
RNEG_2
51
RPOS_0
109
RPOS_1
45
RPOS_2
71
RRing_0
85
RRing_1
79
RRing_2
72
RTIP_0
84
RTIP_1
80
RTIP_2
74
REQEN_0
82
REQEN_1
100
REQEN_2
TYPE
O
O
O
I
I
I
DESCRIPTION
Receive Clock Output - Channel (n):
This output pin is the Recovered Clock signal from the incoming line sig-
nal for Channel (n). The Receive Section of Channel (n) outputs data via
the RPOS_(n) and RNEG_(n) output pins on the rising edge of this clock
signal.
Configure the Receive Section of Channel (n) to update the data on the
RPOS_(n) and RNEG_(n) output pins on the falling edge of RxClk_(n)
by doing one of the following:
a. Operating in the Hardware Mode
Pull the RxClkINV pin to "High".
b. Operating in the HOST Mode
Write a "1" into the RxClkINV bit-field within the Command Register.
Receive Negative Data Output - Channel (n):
This output pin pulses "High" whenever Channel (n) of the XRT73LC03A
has received a Negative Polarity pulse in the incoming line signal at the
RTIP_(n)/RRing_(n) inputs.
NOTE: If the Channel (n) B3ZS/HDB3 Decoder is enabled, then the zero
suppression patterns in the incoming line signal (such as: "00V", "000V",
"B0V", "B00V") is not reflected at this output.
Receive Positive Data Output - Channel (n):
This output pin pulses “High" whenever Channel (n) of the XRT73LC03A
has received a Positive Polarity pulse in the incoming line signal at the
RTIP_(n)/RRing_(n) inputs.
NOTE: If the Channel (n) B3ZS/HDB3 Decoder is enabled, then the zero
suppression patterns in the incoming line signal (such as: "00V", "000V",
"B0V", "B00V") is not reflected at this output.
Receive Ring Input - Channel (n):
This input pin along with RTIP_(n) is used to receive the bipolar line sig-
nal from the Remote DS3/E3/STS-1 Terminal.
Receive TIP Input - Channel (n):
This input pin along with RRing_(n) is used to receive the bipolar line sig-
nal from the Remote DS3/E3/STS-1 Terminal.
Receive Equalization Enable Input - Channel (n):
Setting this input pin "High" enables the Internal Receive Equalizer
within Channel (n). Setting this pin "Low" disables the Internal Receive
Equalizer. The guidelines for enabling and disabling the Receive Equal-
izer are described in Section 3.2.
NOTE: This pin is ignored and should be tied to GND if the XRT73LC03A
is going to be operating in the HOST Mode, (internally pulled-down).
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