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SLM-3650 Satellite Modem
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A.3
Full Duplex Reed-Solomon Card
The Reed-Solomon Duplex board is a 1.2"x 4.2" daughter card for 300 series modems
that can do either Reed-Solomon Encoding or Reed-Solomon Decoding by means of the
Reed-Solomon Interface on the Spartan 2 FPGA. See below for a block diagram of the
Reed-Solomon Duplex card.
Reed-Solomon
Edge Detect
RXDAT
Correlator
RX_EN
DIVIDE BY
TXT
DIVIDE BY 9
CLOCK
THIEVE
Counter
RS BYPASS
TMUXDAT
AUPC
TMUX_EN
ASYNC ENABLE
TMUX_EN
Divide
by 2
Figure A-20. Reed-Solomon Interface on the Spartan 2 FPGA
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DECODER
SOLOMON
ENCODER
REED-
SOLOMON
RS BYPASS
ASYNC ENABLE
RS BYPASS
A–70
AUPC
ASYNC
ENABLE
TXCLK
Revision 3
MN/SLM3650.IOM
DEMUX_DAT
RXCLK
DEMUX_CLK
PLL
TXDATA
TXCLK
PLL
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