A method of issuing a data retrieval command to a re-order unit in a bus bridge is described. The method requires maintaining an indication of the available (or unreserved) capacity in a data buffer into which a data package is received from a memory resource in response to a data retrieval command....http://www.google.com.au/patents/US5974571?utm_source=gb-gplus-sharePatent US5974571 - Method and apparatus for avoiding deadlock in the issuance of commands that are reordered and require data movement according to an original command order
