PCI arbiter doubt in REQ signal

Hi all,

I have got a doubt in PCI arbiter operation .
Assume that a particular device issues a REQ(REQ0) and GRANT(GRANT 0)
is issued to that particular deivce , that device pulls the FRAME
signal low indicating it is using th PCI bus.Now during the entire
duration for which the FRAME signal is low GRANT(GRANT 0) should be
held low for that particular device.

My doubt is if in the FRAME low held duration if any other device
issues a REQ (i.e pulls it low and again pulls it high before the FRAME
has gone high.IS this a valid request OR does the REQ line need to be
held until the GRANT is issued to that particular device.

Thanks in advance,
Praveen

.

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