Electrical computers and digital data processing systems: input/ – Input/output data processing – Direct memory accessing
Reexamination Certificate
2002-05-30
2004-09-14
Fleming, Fritz (Department: 2182)
Electrical computers and digital data processing systems: input/
Input/output data processing
Direct memory accessing
C710S029000, C710S052000
Reexamination Certificate
active
06792481
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to DMA controllers and more particularly to DMA controllers used in controlling real-time data flow to analog signal acquisition and/or generation circuitry.
RELATED ART
Data systems confront a variety of issues relating to data transfer in and out of memories including situations in which data may be lost. This is commonly handled by a direct memory access (DMA) controller. The data loss may occur in the situation in which the data needs to be correlated with other data. This may occur in an audio and video situation in which the audio needs to be timed properly with the video. In some of these situations the loss of the data may not be critical to the utility of the particular transmission that is occurring. It may degrade, in part, the value but perhaps only slightly depending upon the level of degradation. For example in a movie that is being transmitted as video and audio signals, a short term loss of the audio or video may have minimal or perhaps no effect on the enjoyment of the viewer. In many current systems a data loss may result in a required restart in order to reset timings and provide for the data in proper correlation. This can be a noticeably disruptive process.
Thus, there is a need for a DMA controller that reduces the need for restarting.
REFERENCES:
patent: 5247671 (1993-09-01), Adkins et al.
patent: 5648778 (1997-07-01), Linz et al.
patent: 5799064 (1998-08-01), Sridhar et al.
patent: 5878217 (1999-03-01), Cherukuri
patent: 6263410 (2001-07-01), Kao et al.
patent: 6279119 (2001-08-01), Bissett et al.
patent: 2001/0016883 (2001-08-01), Mino
patent: 2001/0056353 (2001-12-01), Li et al.
Hoang Minh
Mitra Rajat
Chen Alan
Clingan, Jr. James I.
Fleming Fritz
Freescale Semiconductor Inc.
Hill Daniel D.
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