CS6403 datasheet(12/54 Pages) CIRRUS

12 / 54 page

Mode Selection

The behavior of the CS6403 is controlled by

configuration-control input pins. The behavior of

the CS6403 for each possible state of these con-

trol signals is illustrated in Table 2.

As indicated in Table 2, the CS6403 has two ba-

sic operating modes. These operating modes are

illustrated in Figure 4.

The simplest operating mode is Mode 1.

This

operating mode is useful in applications where

the data link to the far end is analog, as in ana-

log cellular hands free, or in analog speaker

phones. The SSI is the system timing master in

Mode 1. Long or short framing signals can be

generated. Word length is always 8 bits.

Mode 2 is useful in applications where the data

link to the far end is digital, as in digital cellular

hands free, or in digital (ISDN) speaker phones.

The SSI is the system timing slave in Mode 2.

Only short framing pulses are accepted.

Word

length can be 8 or 16 bits. Mode 2 allows ac-

cess to control registers in 16-bit Mode.

States of Operation

Reset

Reset may be asserted either by setting the RE-

SET (PIN 41Q, 3L) pin high, or by setting the

Reset bit in Synchronous Serial Interface Control

tional difference between these two operations is

that setting the RESET pin clears the RST bit.

During Reset, all chip functions are halted ex-

Configuration

Mode 1:

Master Interface (e.g. CODEC

⇔CS6403)

Application:

Low-cost speaker phone

1.1:

Short-Frame Mode

1.2:

Long-Frame Mode

Mode 2:

Slave Interface (e.g. DSP

⇔CS6403)

Application:

Digital cellular

2.1:

16-bit Mode

2.2:

8-bit Mode

Table 2. CS6403 Configurations

Far End

Near End

Mode 2

Mode 1

DSP

Codec

CS6403

Figure 4. Operating Modes

CS6403

DS192PP6

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