Programming Audio Applications in the i.MX21
●The MC9328MX21 (i.MX21) processor has two dedicated peripherals for audio applications: Serial Synchronous Interface (SSI) and Digital Audio MUX (AUDMUX). A brief description of these two peripherals follows:
■Synchronous Serial Interfaces (SSI):
▲Supports generic SSI interfaces for time-slot based communication with synchronous voice codecs
▲Time-slot mode supports up to 4 channels for communication among devices Bluetooth voice port, voice codecs, and baseband audio ports
▲Supports Philips standard Inter-IC Sound (I2S) bus for external digital audio chip interface at 44.1 kHz and 48 kHz
▲AC'97 Host Controller mode with support for 2 audio channels supporting fixed and variable rate transfers
▲Used in conjunction with the Digital Audio Mux (AUDMUX) module to provide flexible audio and voice routing options
■Digital Audio Mux (AUDMUX):
▲Supports 2 internal hosts, 1 external host, and 3 external peripheral interfaces
▲Flexible audio, voice, and data routing without host processor intervention
▲Built-in support for network mode connection of host and peripheral interfaces
▲Separate and simultaneous audio paths from hosts to peripherals
▲External 4-wire connection to synchronous devices, audio, and voice codecs
●In this application note, typical scenarios of audio applications will be discussed. The use of SSI and AUDUMX in these audio applications will also be examined.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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10/2005 |
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Rev. 1 |
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AN2628 |
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271 KB |
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