What happens if the original requestor is busy when the responder wants to send data. Do "data req" and "Bus Grant" go waste in that case?

@afa4 since this is a pipeline transaction, i think the responder holds the response bus until the original requester signals readiness.

@HingOn: Or the responder could quit and try again later. (Which would mean it would need to re-arbitrate for the response bus.)