TMS320DM647 datasheet(150/182 Pages) TI

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6.17.3 PCI Electrical Data/Timing

6.18 Multichannel Audio Serial Port (McASP) Peripheral

6.18.1 McASP Device-Specific Information

TMS320DM647/TMS320DM648

Digital Media Processor

SPRS372B – MAY 2007 – REVISED APRIL 2008

www.ti.com

Texas Instruments (TI) has performed the simulation and system characterization to be sure that the PCI

peripheral meets all ac timing specifications as required by the PCI Local Bus Specification (version 2.3).

The ac timing specifications are not reproduced here. For more information on the ac timing specifications,

see Section 4.2.3, Timing Specification (33 MHz timing), and Section 7.6.4, Timing Specification (66 MHz

timing), of the PCI Local Bus Specification (version 2.3). Note that the DM647/DM648 PCI peripheral only

supports 3.3-V signaling.

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 DM647/DM648 device includes one multichannel audio serial port (McASP) interface peripheral. 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 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 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

detailed

information

and

the

functionality

the

McASP

peripheral,

see

the

TMS320DM647/DM648 DSP Multichannel Audio Serial Port (McASP) User's Guide (literature number

SPRUEL1).

Peripheral Information and Electrical Specifications

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