STEL-1209/CE Intel, STEL-1209/CE Datasheet - Page 13

• Manufacturer Part Number: STEL-1209/CE
• Description: BPSK/QPSK/16 QAM Burst Modulator Assembly
• Manufacturer: Intel

SCRAMBLER AND FEC SCREEN
This screen provides all the buttons that can be used to
exercise the different features of the STEL-1109 like
Reed-Solomon, Scrambler, and Differential Encoder.
CONTROL SIGNALS
Reed-Solomon Enable
RSDLEN signal can be used to tell the STEL-1109 to
turn on the Reed-Solomon engine. This is the H/W
Control method and the corresponding button should
be selected. Without using the RSDLEN signal, the
Reed-Solomon engine can also be turned on by
selecting the S/W Control and Enable buttons.
Scrambler Enable
SCRMEN signal can be used to tell the STEL-1109 to
turn on the Scrambler engine. This is the H/W Control
method and the corresponding button should be
selected.
Scrambler engine can also be turned on by selecting the
S/W Control and Enable buttons.
Differential Encoder Enable
DIFFEN signal can be used to tell the STEL-1109 to turn
on the Diff. Encoder engine. This is the H/W Control
method and the corresponding button should be
selected. Without using the DIFFEN signal, the Diff.
Encoder engine can also be turned on by selecting the
S/W Control and Enable buttons.
SCRAMBLER
Synchronization
There are two scrambling types. Refer to STEL-1109
for more detail information on Frame and Self
synchronization method.
Without using the SCRMEN signal, the
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Initial and Mask Registers
The Scrambler can be programmed using 24-bit mask
registers and its initialization words as seed.
Polynomial Display updates the randomizer selection
in a polynomial form.
standard.
REED-SOLOMON ENCODER
Primitive Polynomial
There are two RS Encoder polynomials embedded in
the STEL-1109 ASIC to choose from.
Block Code Parameters
N is the block length which can be programmed in the
ranged of 3 to 255 bytes. K represents the number of
actual message bytes in a block code. T tells the error
correction capability in bytes ranging from 0 to 10. T is
a calculated field based on the selection of N and K.
The values chosen for N and K have to satisfy the
condition that N-k must be an even number.
Conversion and Transfer
The serial input data stream is converted into 8-bit
parallel words at the front end of RS Encoder. The
serial to parallel converter can be programmed to make
the first serial input bit the MSB or the LSB of 8-bit RS
symbol. Likewise, the encoded words are converted
back to serial data at the output of the RS Encoder. The
parallel to serial converter can be programmed as well.
CHANGE SCRAMBLER POSITION
The Scrambler and Reed-Solomon Encoder's position is
interchangeable inside of STEL-1109 and this feature
will give the user more flexibility towards specific
applications.
The default is set for Davic
STEL-1209
The