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5.9

Multichannel Audio Serial Port (McASP0) Peripheral

5.9.1

McASP0 Device-Specific Information

TMS320DM642

Video/Imaging Fixed-Point Digital Signal Processor

SPRS200J – JULY 2002 – REVISED AUGUST 2005

The 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).

The TMS320DM642 device includes one multichannel audio serial port (McASP) interface peripheral

(McASP0). The McASP is a serial port optimized for the needs of multichannel audio applications.

The McASP 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 a

pool of 16 shift registers that may be configured to operate as either transmit data, receive data, or

general-purpose I/O (GPIO).

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 supports the TDM

synchronous serial format.

The McASP 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 DSPs).

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

as well as error management.

For more detailed information on and the functionality of the McASP peripheral, see the TMS320C6000

DSP Multichannel Audio Serial Port (McASP) Reference Guide (literature number SPRU041).

5.9.1.1

McASP Block Diagram

Figure 5-32 illustrates the major blocks along with external signals of the TMS320DM642 McASP0

peripheral; and shows the 8 serial data [AXR] pins. The McASP also includes full general-purpose I/O

(GPIO) control, so any pins not needed for serial transfers can be used for general-purpose I/O.

110

DM642 Peripheral Information and Electrical Specifications

TMS320DM642 Datasheet(PDF) 110 Page - Texas Instruments