CS6403 datasheet(14/54 Pages) CIRRUS

14 / 54 page

audio and control data while SLP is asserted, by-

passing the CPU and AFP. Note, however, that

since the CPU is powered down, no scaling is

performed on the ADC input, no echo is can-

celled, and audio data is not companded.

Using the CS6403

Interfacing as a Master to an external codec

(Mode 1)

In applications like speakerphones, it is possible

to connect the CS6403 directly to an external

network codec. An example circuit is shown in

Figure 5.

In this application, SYNCOUT and SCLK are

sourced by the CS6403 (i.e., SMASTER=1), and

CLKIN is generated by connecting a crystal be-

tween CLKOUT and CLKIN.

The timing for

these signals is illustrated in Figure 6.

Audio-data samples in Mode 1 are 8 bits and are

µ−law or A-law companded depending on the

state of the UALAW pin (PIN 13Q, 19L). No

control information can be transferred in Mode

1, so there is no control/data steering bit. Also

note that since control information cannot be

transferred, the default settings of the control

registers established after Reset are used.

In Mode 1, 80 echo-canceller taps (out of the

available 512) are permanently allocated to net-

work-echo cancellation (see Figure 3).

SYNCOUT (out: 8kHz)

SDI (in)

SDO (out)

SYNCOUT (out: 8kHz)

SDI (in)

SDO (out)

SCLK (out)

SFRAME=0; SSYNC = 0

SFRAME=1; SSYNC = 0

SCLK (out)

Mode 1.1 (Short-Frame Mode)

Mode 1.2 (Long-Frame Mode)

Figure 6. External-Codec Mode Timing (Mode 1)

CS6403

DS192PP6

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