Hello,
as already stated in the thread 'Workaround for Fireface iMac Problem'
RME User Forum / Workaround for Fireface/iMac problem
there is a new FW 800 chip on the market from Agere, which seems to be incompatible (not only) to RMEs FireWire audio, and requires workarounds for successful operation.
The reason Apple used this chip instead of the former TI solution is easy to find: half the price and a lot smaller. So it is not astonishing that this chip now also begins to show up on Windows computers. We got our hands on a PCIe FireWire 800 card from Unibrain using this chip, and found the exact (!) same problems under Windows as under Mac OS X using this card.
Our examination of the problem showed that the Agere chip causes the Firefaces to issue a FireWire bus reset shortly after start of data transmission (isochronous mode). We tried a Motu 828 for comparison and found this to be affected as well (everything seemed to work, but playback did not start).
Therefore we have to declare this chip and all related products as incompatible, and expect a fix (if any) from Agere's side, by either firmware or driver updates.
Regards
Matthias Carstens
RME
and the presonus forum
1. Presonus is going to ship new Leopard drivers that will make my FS work with my new Macbook.
If the Agere Chipset that Apple is now using is indeed the cause of the issues you are having, there is no driver that will correct a hardware compatibility issue with that Firewire Chipset. I believe Agere/LSI would be the only one who could possibly correct it.
2. I'm going to buy a new audio interface, because the FS isn't faithful to the IEEE 1394 protocol and I can expect it to give me problems with my Macbook, and other computers I might use it with.
All Firewire interface companies will suggest (and some will even require) the use of certain Firewire chipsets. RME does, MOTU does, and so do many of the other interface companies. It's like Engine companies requiring specific oil for certain engine models. If you use the wrong oil, the engine could perform under spec, and may not even work at all.
3. I'm going to buy a new computer, because my Macbook isn't faithful to the IEEE 1394 protocol and I can expect it to give me problems with my FS, and other interfaces I might use it with.
It's a shame that Apple is trying to cut costs with the Macbooks. Many people have relied on those laptops for audio recording for years. We're still trying to confirm the issues with Agere chipset, as it doesn't always affect the interfaces and it can be random.
Hopefully Apple will give our developers more insight into the situation with those chipsets. Until then, I'd watch out for the Agere firewire connections.
__________________
Ben Mullens
Presonus Technical Support
[email:3vz66cnn]bmullens@presonus.com[/email:3vz66cnn]
and from metric halo on the sonic mailing list
As far as the Agere chipset goes, we have had no reported problems
with any specific model of the Mac except the (quite old at this
point) Mirror Drive Door G4 tower (first gen FW800 machine). The
motherboard FW on that specific model is incompatible with the MIO,
and using the MIO on that machine will require the use of a FW PCI card.
Apple has been using the Agere chipset for some time (I'm pretty sure
that it has been in use in the Mac since the initial Intel iMac came
out), and we have not seen any problems with it.
One of the guys in tech support here just got a brand spanking new
MBP, and AFAIK he has not had any problems with the MIO. I'll double
check with him, and if anything comes up, I'll let you folks know...
Best regards,
B.J. Buchalter
Metric Halo
Metric Halo