CS4216 datasheet(42/58 Pages) CIRRUS

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DIP SWITCH MAPPING TO MULTI-FUNC-

TION PINS

The two PALs on the evaluation board decode

the DIP switches to configure the codec into a

particular mode. These PALs are not necessary

in a design since only one mode is usually used

and can be hard wired. Figure 9 and Figure 10

list the PAL equations used for decoding.

Table 4 shows the CS4216/8 multi-function pin

settings for each possible DIP switch configura-

tion.

Refer to the CS4216/8 data sheets to

determine pin settings for sample frequencies.

Once a suitable mode has been chosen using the

evaluation board, this table will show the hard

wire configuration for each multi-function pin.

Example Mode Settings

Following are two examples of how to set a se-

rial mode with the DIP switches and then

determine the multi-function pin settings for the

codec. These modes were chosen for illustration

only, not to suggest that they are better than

other modes.

A commonly used mode is SM3 Master (SM3-M

on the CS4218), 64 BPF, 44.1kHz sampling rate,

and bit-long SSYNC. To configure the codec in

this mode, set SPF2=MA=1 and all other DIP

switches to zero. From Table 4, the SMODE3,

SMODE2, and SMODE1 pins are set to 010, re-

spectively. The DIV1, DIV2, and DIV3 DIP

switches will set the sampling frequency by di-

rectly mapping to the MF1, MF2, and MF3 pins

as 000. The MA DIP switch sets the MF4 pin

high for master mode. multi-function pins MF5

and MF6 become the general purpose I/O pins

DO2 and DI2, respectively.

In this particular

mode, MF7 determines the high time for the

SSYNC signal. The MF7 pin is set low by the

TS1 switch to generate the bit-long SSYNC. In

all other applicable cases, the TS1 switch is used

for time-slot configuration. 64 BPF is selected

by setting the MF8 pin low with the BPF1

switch.

SM4 is a powerful mode which reduces data

transfer bandwidth to facilitate easier use with

low cost DSPs. As an example, consider SM4,

Slave, 64 BPF, Time-slot 2, and a 22.05 kHz

samp ling

rate.

Set

SPF2=SPF1=DIV1=TS1=BPF1=1 and all other

DIP switches to zero.

Table 4 shows that the

SMODE3, SMODE2, and SMODE1 pins will be

set to 110, respectively. The multi-function pins

MF1-4 will become the control port interface.

MF5 serves as the interrupt pin INT. BPF2 and

BPF1 will set the codec to 64 BPF by mapping

directly to the MF6 and MF7 pins as 01, respec-

tively. The second time-slot is chosen with TS1

DIP SWITCHES

SPF2 SPF1 MA

SMODE SMODE SMODE

MF1

MF2

MF3

MF4

MF5

MF6

MF7

MF8

CS4216 Multifunction Pins

DO4

DO3

DI3

DI4

DO2

DI2

TS1

TS2

DO4

DO3

DI3

DI4

DO2

DI2

TS1

TS2

BPF2

BPF1

DI3

MA=0

DO2

DI2

TS1

TS2

DIV1

DIV2

DIV3

MA=1

DO2

DI2

TS1

BPF1

CDOUT

CDIN

CCLK

CCS

INT

BPF2=0

BPF1

TS1

CDOUT

CDIN

CCLK

CCS

INT

BPF2=1

TS1

TS2

CDOUT

BPF>0

TS1

CDIN

CCLK

CCS

INT

DIV1

DIV2

DIV3

CDOUT

BPF=0

CDIN

CCLK

CCS

INT

DIV1

DIV2

DIV3

Table 4. CS4216 Pin Decode

CDB4216

DS83DB4

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