XRT7302IV Просмотр технического описания (PDF) - Exar Corporation
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XRT7302IV Datasheet PDF : 62 Pages
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XRT7302 2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
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REV. 1.1.6
PIN DESCRIPTION
PIN #
8
SIGNAL NAME
Host/(HW)
9
RxClk0
10
RNEG0
11
RPOS0
12
DGND
13
RLOS0
TYPE
I
O
O
O
****
O
DESCRIPTION
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 XRT7302 to operate in the HOST Mode). In this mode, config-
ure the XRT7302 via the Microprocessor Serial Interface. When the XRT7302
is operating in the HOST Mode, then it ignores the states of many of the dis-
crete input pins.
Setting this input pin "Low" disables the Microprocessor Serial Interface (e.g.,
configures the XRT7302 to operate in the Hardware Mode). In this mode,
many of the external input control pins are functional.
Receive Clock Output pin - Channel 0:
This output pin is the Recovered Clock signal from the incoming line signal for
Channel 0. The receive section of Channel 0 outputs data via the RPOS0 and
RNEG0 output pins on the rising edge of this clock signal.
NOTE: The Receive Section of Channel 0 is configured to update the data on
the RPOS0 and RNEG0 output pins on the falling edge of RxClk0 by doing
one of the following:
a. Operating in the Hardware Mode
Pull the RClkINV pin to "High".
b. Operating in the HOST Mode
Write a "1" into the RClkINV bit-field within the Command Register.
Receive Negative Data Output - Channel 0:
This output pin pulses "High" whenever Channel 0 of the XRT7302 has
received a Negative Polarity pulse in the incoming line signal at the RTIP0/
RRing0 inputs.
NOTE: If the Channel 0 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 Pulse Output - Channel 0:
This output pin pulses "High" whenever Channel 0 of the XRT7302 has
received a Positive Polarity pulse in the incoming line signal at the RTIP0/
RRing0 inputs.
NOTE: If the Channel 0 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 0
Receive Loss of Signal Output Indicator - Channel 0:
This output pin toggles "High" if Channel 0 in the XRT7302 has detected a
Loss of Signal Condition in the incoming line signal.
The criteria the XRT7302 uses to declare an LOS Condition depends upon
whether it is operating in the E3 or STS-1/DS3 Mode.
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