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Odd behavior on GNT

Title: Odd behavior on GNT

PCI experts...

I have a new machine 733Mhz with the i820 chipset that pulses the GNT# line inactive for 1 clock cycle in the middle of a bus master cycle.  The REQ# line is continuously asserted during this event. 

While I don't believe that this is illegal, it certainly is unusual.  Why remove GNT#, unless the arbiter is going to grant the bus to some other master.  Yet if another master was requesting the bus, then GNT# would not be reasserted on the next clock edge?

Anybody have a reason for this behavior or have a reason that it is illegal?

Tony Clark