L64704 LSI Logic Corporation, L64704 Datasheet - Page 102

• Manufacturer Part Number: L64704
• Description: Satellite Decoder Technical Manual 5/97
• Manufacturer: LSI Logic Corporation

Figure 4.17
Viterbi Decoder Output
Waveforms
(Pin ERROROUT)
4.5.7
Viterbi
Depuncture/
Synchronization
Output
Figure 4.18
Viterbi Depuncture/
Synchronization Output
Waveforms
(Pin ERROROUT)
4-18
(Pin DVALIDOUT)
(Pin DVALIDOUT)
DP_DVALIDOUT
V_DVALIDOUT
(Pins CO[6:4])
(Pins CO[2:0])
(Pins CO[0])
S1_INSYNC
(Pin CO[7])
(Pin CO[3])
V_BITERR
DP_S1_E
DP_S0_E
DP_S1
DP_S0
OCLK
V_CO
OCLK
The L64704 outputs the decoded Viterbi data stream serially on pin CO0
one bit per OCLK cycle. The V_DVALIDOUT signal indicates whether
data on CO0 is valid on a cycle-by-cycle basis. The V_BITERR signal
carries information on errors found in the Viterbi output bit stream. If the
L64704 deasserts V_BITERR, it indicates that the decoder has not
correctly decoded the current data on V_CO.
You can observe the outputs of the Viterbi synchronization stage and the
associated depuncturing module by setting the OS[2:0] bits to 0b110.
Figure 4.18
tion/Depuncture module output signals. Signals prefixed by “DP_” are
driven on the pin indicated in parenthesis below the signal name.
Channel Interfaces and Data Control
shows the waveforms for the Viterbi Synchroniza-