L64704 LSI Logic Corporation, L64704 Datasheet - Page 101
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L64704
Manufacturer Part Number
L64704
Description
Satellite Decoder Technical Manual 5/97
Manufacturer
LSI Logic Corporation
Datasheet
1.L64704.pdf
(220 pages)
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4.5.5
Synchronization
Stage 2 Output
Figure 4.16
Synchronization
Stage 2 Output
Waveforms
(Pin FSTARTOUT)
4.5.6
Viterbi Decoder
Output
(Pin ERROROUT)
(Pin DVALIDOUT)
S2_FSTARTOUT
S2_DVALIDOUT
(Pins CO[7:0])
S2_INSYNC
S2_CO[7:0]
OCLK
You can observe the output of the synchronization stage preceding the
Deinterleaver by setting the OS[2:0] bits to 0b100. Synchronization Stage
2 detects the predefined synchronization word to properly align the data
stream.
2 output signals. Signals prefixed by “S2_” are driven on the pin indicated
in parenthesis below the signal name.
You can observe the S2_INSYNC signal to monitor the state of the sec-
ond synchronization stage. When the L64704 asserts S2_INSYNC, it
indicates that the decoder has established frame synchronization. When
the L64704 deasserts S2_INSYNC, it indicates an out-of-sync condition.
You can observe the outputs of the Viterbi decoder module by setting the
OS[2:0] bits to 0b101. You use this mode to observe the decoded data
after only the inner layer of decoding.
for the Viterbi Decoder output signals. Signals prefixed by “V_” are driven
on the pin indicated in parenthesis below the signal name.
Data Path Output Configurations
Figure 4.16
shows the waveforms for the Synchronization Stage
Frame Length
Figure 4.17
shows the waveforms
4-17
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