205 when the frame is built the status is updated in fifo 114 c the same is performed when the frame is sent in step s 206 after the frame is sent the process mc 115 determines if the frame is lost this is based on whether the host system indicates that the frame has been received if the frame is not lost then in step s 207 the entry is vacated for the next frame if the frame is lost then the process starts again however frame processing does not have to begin from step s 200 instead the processing is resumed from a known point since frame status is continuously updated from the time a frame is created to the time it is sent mc 115 can tag frames using various identifiers for example a frame may be tagged so that link module 113 discards the frame a frame is tagged as an interlock non interlock frame a frame may be tagged as an error frame or the last frame is tagged as the u201c last frame u201d of a read command the foregoing process allows mc 115 to know who requested a frame where in buffer 111 did the frame come from how many blocks comprise the frame and all.