| 摘要 |
A serial to parallel interface for coupling multiple channels of audio input data to a digital audio workstation (DAW) having at least one processor capable of performing digital signal processing functions is formed from a programmable ASIC. The serial to parallel interface includes configuration registers which may be programmed to allow the interface to communicate with external audio devices that are operating in any audio format and bit width format. The serial to parallel interface includes a double buffered input and output serial datapath. The double buffered input and output datapath eases timing constraints between the interface and the DSP, thus allowing the DSP the flexibility of being able to read data at almost any point during an audio data transmission period. In addition, the double buffering mechanism within the serial to parallel interface allows for sample receipt errors to be isolated from the DSP, thereby ensuring the integrity of the audio data before it is propagated to the DAW. State machines, internal to the serial to parallel interface, provide control signals to the double buffered datapath in accordance with an external clocking signal associated with the external audio devices, and thus the serial to parallel interface is able to communicate with external devices operating at any frequency without modification. In addition, because the serial to parallel interface is implemented in a single ASIC, it is able to provide a communication link for an increased number of channels and thereby improve the operability of the DAW. |
