Arbitrator

[Jon Keeble <j.keeble@fairlightesp.com.au>]

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.