[linux-dvb] Re: Network: a new hope

[Ralph Metzler <rjkm@metzlerbros.de>]

Robert Schlabbach writes:
 > From: "Emard" <emard@softhome.net>
 > > > > Some issues seem more like a bug than "graceful recovery",
 > > > > particularly the fact that the SAA7146A will sometimes not _finish_
 > > > > DMA transfers. With burst and FIFO threshold set to 4 Dwords, the
 > > > > chip _randomly_ does not DMA the last 2-8 Dwords. I'd say the
 > > > > SAA7146A's PCI logic is simply bugged.
 > >
 > > not bugged, it's even worse: it has too small FIFO compared to other
 > > conccurrent PCI devices
 > 
 > That, too, but if that was the issue I am seeing, it would occur _anywhere_
 > during the DMA transfer. But the fact that I regularly only get missing
 > Dwords at the _end_ of a transfer means that the SAA7146A tends to stop
 > transferring too early, and that is not a question of FIFO length...
 > 
 > Out of curiousity: Does anyone here know a better suited PCI bridge chip?
 > Maybe one that is dedicated to MPEG2TS-to-PCI DMA and has none of that
 > obsolete analog video stuff in it?

There are cards with SAA7130. It still has the analog video stuff but
the input used for TS is actually designed for TS input.


Ralph


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