PCM5142 datasheet(21/123 Pages) TI2

21 / 123 page

PCM5141, PCM5142

www.ti.com

SLAS759B – AUGUST 2012 – REVISED JANUARY 2016

8.3.4 Audio Processing

8.3.4.1 PCM514x Audio Processing Options

8.3.4.1.1

Overview

The PCM514x features a fully-programmable miniDSP core. The algorithms for the miniDSP must be loaded into

the device after power up. The miniDSP has direct access to the digital stereo audio stream, offering the

possibility for advanced DSP algorithms with very low group delay. The miniDSP can run up to 1024 instructions

on every audio sample at a 48-kHz sample rate.

NOTE

At higher sampling frequencies, fewer instruction cycles are available. (For example, 512

instructions can be done in a 96-kHz frame.)

The PCM514x supports two different code sources. ROM based process flow (See the next section for how to

select) and RAM based process flow. In program 31 (RAM based), different algorithms can be called from ROM -

such as EQ, DRC and Zero Crossing volume control. Please see the PurePath Studio Development Environment

for more details.

8.3.4.1.2

miniDSP Instruction Register

Registers on Page 152-169 are 25-bit instructions for the miniDSP engine. For details, see Table 53. 7 bits of

Instr(32:25) in Base register +0 are reserved bits. 1 bit of Instr(24) - (LSB) in Base register +0 is MSB bit of 25 bit

instruction. These instructions control miniDSP operation. When the fully programmable miniDSP mode is

enabled and the DAC channel is powered up, the read and write access to these registers is disabled.

8.3.4.1.3

Digital Output

The PCM514x supports an SDOUT output. This can be selected within the process flow, and driven out of a

GPIO pin selected in the register map (for example, Page 0 / Register 80). Users should note that the I2S output

will be attenuated by 0.5 dB. A full scale (FS) output will actually be FS-0.5dB. This can be compensated for

within the process flow using PurePath Studio. The I2S output can be a separate audio stream to the analog

DAC output, allowing 2.1 and 2.2 systems to be implimented. By default, the SDOUT is not linked to the volume

control registers on Page 0 / Register 60, 61, 62. However, it is possible to configure the SDOUT component in

Purepath studio to mirror that register.

8.3.4.1.4

Software

Software development for the PCM514x is supported through TI's comprehensive PurePath ™Studio; a powerful,

easy-to-use tool designed specifically to simplify software development on the PCM514x miniDSP audio

platform.

Please visit the PCM514x product folder on www.ti.com to learn more about PurePath Console and the latest

status on available, ready-to-use DSP algorithms.

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Product Folder Links: PCM5141 PCM5142

PCM5142 Datasheet(PDF) 21 Page - Texas Instruments

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