Apparatus for and method of accurately obtaining the cycle time

Details Apparatus for and method of accurately obtaining the cycle time Apparatus for and method of accurately obtaining the cycle time

1997-10-21

2000-03-21

Hoff, Marc S.

Data processing: measuring, calibrating, or testing

Measurement system

Time duration or rate

702 79, 714 47, G06F 1134

Patent

active

060412860

ABSTRACT:
In order to accurately obtain the cycle time at which transmission of a video frame, within an isochronous video stream of data, is complete, a command is added at the end of the video frame. The added command causes the value of the cycle time register to be read and recorded when the transmission of a video frame is complete. Preferably, the added command is a load quad command which records the value of the cycle time register within the command structure. When the transmitting application then receives the interrupt, notifying it that transmission of the video frame is complete, the application obtains the previously recorded cycle time value from the load quad command structure. Preferably, the video frame is part of an isochronous stream of video data which is transmitted over an IEEE 1394 serial bus network. In this manner, the cycle time corresponding to the completion of each video frame within the stream of data is accurately obtained.

REFERENCES:
patent: 4225922 (1980-09-01), Porter
patent: 5047919 (1991-09-01), Sterling et al.
patent: 5204956 (1993-04-01), Danuser et al.
patent: 5394556 (1995-02-01), Oprescu
patent: 5495481 (1996-02-01), Duckwall
patent: 5517639 (1996-05-01), Yamaguchi
patent: 5764930 (1998-06-01), Staats
patent: 5793366 (1998-08-01), Mano et al.
patent: 5802057 (1998-09-01), Duckwall et al.

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