CS8420-CSZ datasheet(55/94 Pages) CIRRUS

55 / 94 page

DS245F4

CS8420

13. HARDWARE MODES

13.1

Overall Description

The CS8420 has six Hardware modes, which allow use of the device without using a micro-controller to ac-

cess 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 following sections describe

the data flows and pin definitions for each Hardware mode.

13.1.1

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 5. Start-up options are used exten-

sively 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.

13.1.2

Serial Audio Port Formats

In Hardware mode, only a limited number of alternative serial audio port formats are available. These for-

mats are described by Tables 6 and 7, which define the equivalent Software mode bit settings for each

format. Timing diagrams are shown in Figures 17 and 18.

For each Hardware mode, the following pages contain a data flow diagram, a pin-out drawing, a pin de-

scriptions 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 5. Hardware Mode Definitions

SOSF

SORES1/0

SOJUST

SODEL

SOSPOL

SOLRPOL

OF1 - Left-Justified

OF2 - I²S 24-bit data

OF3 - Right-Justified, Master

mode only

000

OF4 - I²S 16-bit data

OF5 - Direct AES3 data

Table 6. Serial Audio Output Formats Available in Hardware Mode

SISF

SIRES1/0

SIJUST

SIDEL

SISPOL

SILRPOL

IF1 - Left-Justified

IF2 - I²S

IF3 - Right-Justified 24-bit data

IF4 - Right-Justified 16-bit data

Table 7. Serial Audio Input Formats Available in Hardware Mode

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