CS4218 datasheet(40/44 Pages) CIRRUS

40 / 44 page

Appendix B: Applications of SM4

Figure B1 illustrates one method of using Serial Mode 4 wherein a DSP controls the audio serial port

and a microcontroller controls the control port. Each controller is run independently and the micro

updates the control information only when needed, or when an interrupt from the CS4218 occurs.

Figure B2 illustrates the minimum interface to the CS4218. In this application, the DSP sends and

receives stereo DAC and ADC information. The CS4218 is configured for 32 bits per frame, Master

sub-mode. The control data resets to all zeros, which configures the CS4218 as a simple stereo codec:

no gain, no attenuation, line inputs #1, and DAC outputs not muted.

Figure B3 illustrates how to use all the CS4218 features with a low cost DSP that cannot support the

interrupt rate of SM3. Using SM4 (32 bits per frame, Master sub-mode) reduces the DSP interrupts in

half since the control data is split from the audio data. This circuit is comprised of three independent

sections which may individually be eliminated if not needed.

Micro-

Controller

Serial

Port

General

Purpose

Port

Pins

IRQ

DSP

SDOUT

SDIN

SSYNC

SCLK

CS4218

MF1:CDOUT

MF2:CDIN

MF4:CCS

MF3:CCLK

RESET

MF8:F3

MF7:F2

MF6:F1

MF5:INT

SM4

VD+

Figure B1. SM4 - Microcontroller Interface

DSP

SDOUT

SDIN

SSYNC

SCLK

CS4218

MF1:CDOUT

MF2:CDIN

MF4:CCS

MF3:CCLK

MF5:INT

SM4

VD+

RESET

MF8:F3

MF7:F2

MF6:F1

Hard Wired or

DIP Switch

selectable

32 BPF

Figure B2. SM4 - Minimum DSP Interface

CS4218

DS135F1

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