9 Dec
2003
9 Dec
'03
4:27 a.m.
Mark Knecht wrote:
USB isochronous transfers happen once per millisecond.
Regards,
Clemens
On Mon, 2003-12-08 at 16:29, Jack O'Quin wrote:
> Steve Harris <S.W.Harris(a)ecs.soton.ac.uk> writes:
>
> > Latency shouldn't be an issue - the 1394 bus is low latency - higher
> > latency than PCI I expect, but still not measurable in audio terms.
>
> Does it have the same problem as USB, using fixed-time rather than
> fixed-size packets?
Yes.
I seem to
recall that it does, but that the packet size is smaller,
making the latency problem easier to deal with.
Isoch - 1394 has a timer operating on the bus. This timer happens
(roughly) every 125uS.