CS47048 Data Sheet

Audio SOC Processor Family

DS787A7

Copyright 2008 Cirrus Logic

9

CS47048 functionality is controlled by application codes that are stored in on-chip ROM or

downloaded to the CS47048 from a host controller or external serial FLASH/EEPROM.

then compile the image into a series of commands that are sent to the CS47048 through the SCP.

The processing application can either load modules (post-processors) from the DSP’s on-chip

ROM, or custom firmware can be downloaded through the SCP.

The CS47048 is suitable for a variety of audio post-processing applications where sound quality via

sound enhancement and speaker/cabinet tuning is required to achieve the sound quality

consumers expect. Examples of such applications include automotive head-ends, automotive

amplifiers, docking stations, sound bars, subwoofers, and boom boxes.

4.2 DSP Memory

The DSP core has its own on-chip data and program RAM and ROM and does not require external

memory for post-processing applications.

The Y-RAM and P-RAM share a single block of memory that includes three 2K word blocks (32

bits/word) that are assignable to either Y-RAM or P-RAM as shown in Table 3.

4.2.1 DMA Controller

The powerful 8-channel DMA controller can move data between 8 on-chip resources. Each

resource has its own arbiter: X, Y, and P RAMs/ROMs and the peripheral bus. Modulo and linear

addressing modes are supported, with flexible start address and increment controls. The service

intervals for each DMA channel, as well as up to 6 interrupt events, are programmable.

4.3 On-chip DSP Peripherals

4.3.1 Analog to Digital Converter Port (ADC)

The CS47048 features ADCs with dynamic range performance in excess of 100 dB, and they can

support up to 4 simultaneous channels of analog-to-digital conversion. Analog inputs AIN_1A and

AIN_1B are connected directly to one stereo ADC (ADC0-1). The analog input capability of the

second stereo ADC (ADC2-3) is expanded through a 5:1 analog stereo mux (analog inputs

AIN_2A/B through AIN_6A/B). This gives the CS47048 the ability to select from six stereo pairs of

analog input. A single programmable bit selects single-ended or differential mode signals for all

inputs.

The conversions are performed with either Fs=96 kHz or Fs=192 kHz.

4.3.2 Digital to Analog Converter Port (DAC)

The CS47048 can support up to 8 simultaneous channels of digital-to-analog conversion and

features DACs with dynamic range performance in excess of 100 dB. The DACs have voltage

mode outputs that can be connected either as single-ended or differential signals. The conversions

are performed with Fs=96 kHz.

P-RAM

X-RAM

Y-RAM

14K words

10K words

8K words

12K words

10K words

10K words

10K words

10K words

12K words

8K words

10K words

14K words