A request interface device and method for operating the device and its components are described. The request interface device comprises a bus interface unit (BIU) and a requesting device. The requesting device generates a transfer request for data or command information, along with state information determining the manner in which the requester will transfer the data or command information associated with the request once the transfer request is granted. The transfer request and the associated state information are sent to the BIU, freeing the requester to generate new requests wile the first transfer request is waiting to be granted. The transfer request and associated information is stored in a queue within the BIU while the BIU logic gains access to the host bus. Once the transfer request is granted, it is sent over the host bus to its target while the associated state information is concurrently reflected back to the requestor to be used by the requester to complete the data or command information transfer.