Data processing systems

A data processing system comprises a processing unit 1, 2, 3, 10, a codec 20, and a communications bus 5 over which bus transactions to access memory 6 can be performed. The processing unit is operable to initiate over the communications bus, bus transactions that comprise the codec accessing the me...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Håkan Lars-Göran Persson, Vladimir Dolzhenko
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:A data processing system comprises a processing unit 1, 2, 3, 10, a codec 20, and a communications bus 5 over which bus transactions to access memory 6 can be performed. The processing unit is operable to initiate over the communications bus, bus transactions that comprise the codec accessing the memory, and the codec is operable to, in response to the processing unit initiating such a bus transaction over the communications bus, access the memory. The processing unit may be operable to issue over the communications bus, a signal that indicates that the codec should access the memory, and the codec may be operable to access the memory in response to receiving the signal that indicates that the codec should access the memory. The codec may be operable to determine whether the codec should access the memory in response to a received bus transaction request. Upon positive determination, the memory is accessed, and upon negative determination the received bus transaction request is forwarded without accessing the memory.