Abstract: An audio codec (100) is provided with a control sequencer (110) interposed between control interface logic (120) and control registers (130) of the codec. A memory (114, 116) associated with the control sequencer (110) enables a burst of operations to be preloaded into the audio codec. In response to a single command from an external control processor (20), the sequencer (110) can then execute the burst with precise delays between each operation and without further direction from the processor. This frees the processor (20) to concentrate on other tasks within the system, and/or to enter a low-power mode to conserve energy. The system may be a personal media player.

Abstract: An integrated circuit for digital signal routing. Signal routing is achieved by means of a multiply-accumulate block, which takes data from one or more data source and, after any required scaling, generates output data for a data destination. The multiply-accumulate block operates on a time division multiplexed basis, so that multiple signal paths can be processed within one period of the sample clock. Each signal path has a respective sample clock rate, and paths with different sample clock rates can be routed through the multiply-accumulate block on a time division multiplexed basis independently of each other. Thus, speech signals at 8 kHz or 16 kHz can be processed concurrently with audio data at 44 kHz or 48 kHz.

Abstract: The present invention relates to methods and apparatus for data transfer. A data interface is described with at least a first data terminal for either outputting or receiving a data signal. In bi-directional embodiments there may be one terminal for receiving data and one terminal for outputting data. A bit clock terminal outputs or receives a bit clock signal; and a frame clock terminal for outputs or receives a frame clock signal. Interface control circuitry is configurable to associate data outputted or received in each frame with time slots (1-8) of a predetermined number of bits (x, y, z) wherein the control circuitry is adapted such that the frequency of the bit clock signal can be changed at any time so as to vary the number of time slots in a frame.

Abstract: An audio codec (100) is provided with a control sequencer (110) interposed between control interface logic (120) and control registers (130) of the codec. A memory (114, 116) associated with the control sequencer (110) enables a burst of operations to be preloaded into the audio codec. In response to a single command from an external control processor (20), the sequencer (110) can then execute the burst with precise delays between each operation and without further direction from the processor. This frees the processor (20) to concentrate on other tasks within the system, and/or to enter a low-power mode to conserve energy. The system may be a personal media player.