Yep, controlled by the CPU card. And...
The CPU card must have a Clock Buffer/Distribution chip on board to split that clock up and send it out on five or six pins on the CPU card. Those clock pins are then routed to various devices on the motherboard.
There are also three Clock ID pins on the CPU card which are grounded or not. The various combination tell the Hammerhead controller what bus speed range the CPU card falls into so that it can adjust some MB timing parameters appropriately.
Let's see, pinout for the Mac CPU card is here:
http://www.io.com/~trag/x500_CPU_Pinout
Hmmm. That Sonnet card is supposed to solve the six-slot PCI Mac arbitration problem with G4 processors, right? So that's probably not the problem.
I would consider trying a different ethernet card. The ones with the RealTek chipsets on them seem pretty good.
If you want to try something really fun, go to compuvest.com and get the USB2, FW, gigabit e-net card by SIIG, which they have for $30. I'm not guaranteeing it will work, but iIve seen reports that it does. It uses a TI chipset for USB, NEC for Firewire, and RealTek for E-net (might have the first two backwards) so all the chipsets are well supported on the Mac. The only issue might be that the first generation of PCI Macs have some bugs when dealing with multi-fucntion cards.
The CPU card must have a Clock Buffer/Distribution chip on board to split that clock up and send it out on five or six pins on the CPU card. Those clock pins are then routed to various devices on the motherboard.
There are also three Clock ID pins on the CPU card which are grounded or not. The various combination tell the Hammerhead controller what bus speed range the CPU card falls into so that it can adjust some MB timing parameters appropriately.
Let's see, pinout for the Mac CPU card is here:
http://www.io.com/~trag/x500_CPU_Pinout
Hmmm. That Sonnet card is supposed to solve the six-slot PCI Mac arbitration problem with G4 processors, right? So that's probably not the problem.
I would consider trying a different ethernet card. The ones with the RealTek chipsets on them seem pretty good.
If you want to try something really fun, go to compuvest.com and get the USB2, FW, gigabit e-net card by SIIG, which they have for $30. I'm not guaranteeing it will work, but iIve seen reports that it does. It uses a TI chipset for USB, NEC for Firewire, and RealTek for E-net (might have the first two backwards) so all the chipsets are well supported on the Mac. The only issue might be that the first generation of PCI Macs have some bugs when dealing with multi-fucntion cards.