AM3892 datasheet(248/299 Pages) TI

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AM3894

AM3892

SPRS681A – OCTOBER 2010 – REVISED MARCH 2011

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8.12 Multichannel Audio Serial Port (McASP)

The multichannel audio serial port (McASP) functions as a general-purpose audio serial port optimized for

the needs of multichannel audio applications. The McASP is useful for time-division multiplexed (TDM)

stream, Inter-Integrated Sound (I2S) protocols, and intercomponent digital audio interface transmission

(DIT).

8.12.1 McASP Device-Specific Information

The device includes three multichannel audio serial port (McASP) interface peripherals (McASP0,

McASP1, and McASP2). The McASP module consists of a transmit and receive section. These sections

can operate completely independently with different data formats, separate master clocks, bit clocks, and

frame syncs or, alternatively, the transmit and receive sections may be synchronized. The McASP module

also includes shift registers that may be configured to operate as either transmit data or receive data. The

transmit section of the McASP can transmit data in either a time-division-multiplexed (TDM) synchronous

serial format or in a digital audio interface (DIT) format where the bit stream is encoded for S/PDIF,

AES-3, IEC-60958, CP-430 transmission. The receive section of the McASP peripheral supports the TDM

synchronous serial format.

The McASP module can support one transmit data format (either a TDM format or DIT format) and one

receive format at a time. All transmit shift registers use the same format and all receive shift registers use

the same format; however, the transmit and receive formats need not be the same. Both the transmit and

receive sections of the McASP also support burst mode, which is useful for non-audio data (for example,

passing control information between two devices).

The McASP peripheral has additional capability for flexible clock generation and error detection/handling,

as well as error management.

The device McASP0 module has six serial data pins, while McASP1 and McASP2 are limited to two serial

data pins each.

The McASP FIFO size is 256 bytes and two DMA and two interrupt requests are supported. Buffers are

used transparently to better manage DMA, which can be leveraged to manage data flow more efficiently.

For more detailed information on and the functionality of the McASP peripheral, see the McASP chapter in

the AM38x Sitara ARM Microprocessors (MPUs) Technical Reference Manual (literature number

SPRUGX7).

248

Peripheral Information and Timings

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