Request/Grant Tuning

[pavel.peleska@oen.siemens.de]

Hallo PCIers,

in chapter 3.4.1. the PCI Spec states "..one GNT# can be deasserted 
conincident with another GNT# being asserted if the bus is not in the Idle 
State. Otherwise, a one clock delay is required between the deassertion of 
a GNT# and the assertion of another GNT#, or else there may be contention 
on the AD lines ... 

...due to the master doing address stepping."
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Is the arbiter allowed to deasserted one GNT# conincident with asserting 
another GNT# if the bus is in the Idle state if it is known that no device 
in the system is using address stepping?

Are there any devices -not using address stepping- that may get confused if 
the arbiter does not insert one clock delay between deassertion of one GNT# 
and the assertion of another GNT# if the bus is in the Idle state?

Any comments appreciated,
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Pavel Peleska		Tel: ++49 89 722-41253
Siemens AG			Fax: ++49 89 722-28502
SN EBG 11
Hofmannstr. 51
81359 Munich		Pavel.Peleska@oen.siemens.de
Germany
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