CS8420 datasheet(49/80 Pages) CIRRUS

49 / 80 page

CS8420

DS245PP2

14. HARDWARE MODES

14.1

Overall Description

The CS8420 has six hardware modes, which allow

use of the device without using a micro-controller

to access the device control registers and CS & U

data. The flexibility of the CS8420 is necessarily

limited in hardware mode. Various pins change

function in hardware mode, and various data paths

are also possible. These alternatives are identified

by hardware mode numbers 1 through 6. The fol-

lowing sections describe the data flows and pin def-

initions for each hardware mode.

14.1.1

Hardware Mode Definitions

Hardware mode is selected by connecting the H/S

pin to ‘1’. In hardware mode, 3 pins (DFC0, DFC1

& S/AES) determine the hardware mode number,

according to Table 3Start-up options are used ex-

tensively in hardware mode. Options include

whether the serial audio output ports are master or

slave, the serial audio ports’ format and whether

TCBL is an input or an output. Which output pins

are used to set which modes depends on which

hardware mode is being used.

14.1.2

Serial Audio Port Formats

In hardware mode, only a limited number of alter-

native serial audio port formats are available. These

formats are described by Tables 4 & 5, which de-

fine the equivalent software mode bit settings for

each format. Timing diagrams are shown in Figures

16 and 17.

For each hardware mode, the following pages con-

tain a data flow diagram, a pin-out drawing, a pin

descriptions list and a definition of the available

start-up options.

DFC1 DFC0 S/AES

Hardware Mode Number

1 - Default Data Flow, AES3 input

2 - Default Data Flow, serial input

3 - Transceive Flow, with SRC

4 - Transceive Flow, no SRC

5 - AES3 Rx only, AES3 input

6 - AES3 Tx only, serial input

Table 3. Hardware Mode Definitions

SOSF SORES1/0 SOJUST SODEL SOSPOL SOLRPOL

OF1 - Left Justified

OF2 - I2S 24-bit data

000

OF3 - Right Justified, master

mode only

000

OF4 - I2S 16 bit data

010

OF5 - Direct AES3 data

Table 4. Serial Audio Output Formats Available in Hardware Mode

SISF

SIRES1/0 SIJUST

SIDEL

SISPOL

SILRPOL

IF1 - Left Justified

IF2 - I2S

000

IF3 - Right Justified

24-bit data

000

IF4 - Right Justified

16-bit data

010

Table 5. Serial Audio Input Formats Available in Hardware Mode

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