xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 96
xrt94l33
Manufacturer Part Number
xrt94l33
Description
Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
Manufacturer
Exar Corporation
Datasheet
1.XRT94L33.pdf
(465 pages)
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XRT94L33
Rev.1.2.0.
AD5
AC7
AE4
AB8
RxTOHFrame
RxTOHValid
RxTOHClk
RxTOH
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
O
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O
O
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ECEIVE
CMOS
CMOS
CMOS
CMOS
T
RANSPORT
Receive TOH Output Port – Clock Output:
This
“RxTOHFrame” function as the “Receive TOH Output Port”.
The Receive TOH Output Port permits the user to obtain the value
of the TOH Bytes, within the incoming STS-3/STM-1 signal.
This output pin provides the user with a clock signal.
“RxTOHValid” output pin is “HIGH”, then the contents of the “TOH”
bytes, within the incoming STS-3 data-stream will be serially output
via the “RxTOH” output.
This data will be updated upon the falling edge of this clock signal.
Therefore, the user is advised to sample the data (at the “RxTOH”
output pin) upon the rising edge of this clock output signal.
Receive TOH Output Port – TOH Valid (or READY) indicator:
This output pin, along with “RxTOH” and “RxTOHFrame” function
as the “Receive TOH Output Port”.
This output pin will toggle “HIGH” whenever valid “TOH” data is
being output via the “RxTOH” output pin.
Receive TOH Output port – Output pin:
This output pin, along with “RxTOHClk”, RxTOHValid” and
“RxTOHFrame” function as the “Receive TOH Output port.
All TOH data that resides within the incoming STS-3 data-stream
will be output via this output pin.
The “RxTOHValid” output pin will toggle high, coincident with
anytime a bit (from the Receive STS-3 TOH data) is being output
via this output pin.
The “RxTOHFrame” output pin will pulse “high” (for eight periods of
“RxTOHClk”) coincident to when the A1 byte is being output via
this output pin.
Data, on this output pin, is updated upon the falling edge of
“RxTOHClk”.
Receive TOH Output Port – STS-3/STM-1 Frame Indicator:
This output pin, along with the “RxTOHClk”, “RxTOHValid” and
“RxTOH” output pins function as the “Receive TOH Output port”.
This output pin will pulse “high”, for one period of “RxTOHClk”, one
“RxTOHClk” period prior to the very first “TOH” bit (of a given STS-
3 frame) being output via the “RxTOH” output pin.
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