Re: Arbitrator

["venky" <venky_lt@rediffmail.com>]

Hello,
Can u provide more details, in which conditions that statements 
are given.
Is it mentioned anywhere in the PCI2.2 specs.


Venkat
On Tue, 16 Apr 2002 Jon Keeble wrote :
>I have a prototype 'riser' card that has a couple of PCI slots 
>that plugs
>into a PCI bus, and a PLD for handling arbitration.
>
>The 'secondary arbitrator' is to support BR / BG for cards 
>plugged into the
>riser.
>
>For my purposes the priority of each card can be ignored i.e. 
>simultaneous
>requests could always be given to one particular slot.
>
>Having stared at the PCI arbitrator documentation for a while, 
>I've
>concluded that it is
>   - 'safe' to delay a GNT (from the mother board) by one cycle 
>to either
>card under all possible conditions.
>   - 'safe' to delay a REQ (from either card) to the 
>motherboard.
>
>If anyone is aware of anything to the contrary pls let me know.
>
>Regards
>
>Jon Keeble.
>