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5.14 Audio Serial Port (ASP)

TMS320DM355

Digital Media System-on-Chip (DMSoC)

SPRS463 – SEPTEMBER 2007

DM355 includes two separate ASP controllers. The primary use for the audio serial port (ASP) is for audio

interface purposes. The primary audio modes that are supported by the ASP are the AC97 and IIS modes.

In addition to the primary audio modes, the ASP supports general serial port receive and transmit

operation, but is not intended to be used as a high-speed interface. The ASP is backward compatible with

other TI ASPs. The ASP supports the following features:

• Full-duplex communication

• Double-buffered data registers, which allow a continuous data stream

• Independent framing and clocking for receive and transmit

• External shift clock generation or an internal programmable frequency shift clock

• Double-buffered data registers, which allow a continuous data stream

• Independent framing and clocking for receive and transmit

• Direct interface to industry-standard codecs, analog interface chips (AICs), and other serially

connected analog-to-digital (A/D) and digital-to-analog (D/A) devices

• Direct interface to AC97 compliant devices (the necessary multiphase frame synchronization capability

is provided)

• Direct interface to IIS compliant devices

• A wide selection of data sizes, including 8, 12, 16, 20, 24, and 32 bits

• μ-Law and A-Law commanding

• 8-bit data transfers with the option of LSB or MSB first

• Programmable polarity for both frame synchronization and data clocks

• Highly programmable internal clock and frame generation

For more detailed information on the ASP peripheral, see the Documentation Support section for the

Audio Serial Port (ASP) Reference Guide.

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Peripheral Information and Electrical Specifications

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TMS320DM355 Datasheet(PDF) 137 Page - Texas Instruments