Johannes Stezenbach wrote:
In MIS mode both streams can have different mod/fec. However,
I don't see any per-stream_id mod/fec registers in the
STB0899 data sheet, and certainly you don't imply there's
an API call necessary per received frame to change the
settings?
Really, IMHO the only way this can work is if the demod
can read MODCOD from PLHEADER and reconfigure mod/fec
automatically per frame.
And if it can do it for MIS, it can do the same for SIS.
(And indeed, the STB0899 data sheet has seperate registers
for BBHEADER and PLHEADER fields extrated from the
stream, and ones where you can supply your own values.
The description is vague but talks about "forcing" your own
values. This might mean that this is just a test/debug feature
and not necessary for normal operation.
*Add a BIG questionmark here.*)
It's a bit complex device, i agree ..
p 134
[7:0] ISI_ENTRY: This entry is to be matched against ISI byte of the
stream (MATYPE.byte2) if MATYPE.SIS/
MIS (MATYPE.byte1) is at 0.
Let me explain what i understand.. I have to match the descrambled
header output from the BBHEADER with that from the incoming stream. If
it matches, set the ISI_ENTRY to the one from the S2 satellite delivery
system descriptor.
Manu
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