Method and system for ordering requests at a bus interface

A system comprising:

• means for receiving at a bus interface a request for access to a resource;
• means for employing a first counter to assign a value to the request;
• and
• means for granting the requested access to the resource when a second counter reaches a value equal to the value assigned by the first counter to the request, wherein the bus interface can perform work on the request while the request waits for access to the resource.

A system comprising:

• a bus bridge for coupling between a first bus and a second bus, the bus bridge including:
• multiple ticket registers;
• a ticket dispenser counter for dispensing a ticket value to a request received at the bus bridge from the first bus for access to the second bus, the ticket value being held in one ticket register of the multiple ticket registers;
• and
• a ticket call counter for providing ticket call values, wherein the request is granted access to the second bus when a ticket call value equals the ticket value dispensed to the request by the ticket dispenser counter, and wherein the bus bridge can perform work on the request while the request waits for access to the second bus.