TLV320AIC21 datasheet(34/56 Pages) TI1

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D11

DIN (Read)

DIN (Write)

Don’t care

D15

D13

D14

D13

D14

D10

D11

DOUT (Read)

D15

D13

D14

D12

Data to be Written Into Register

D7 - D0

R/W Broadcast

Address

SMARTDM Device

Address

Master FS

DIN

Master

Slave2

Slave1

Slave0

Master

Slave2

Slave1

Slave0

Master

Slave2

Slave1

Slave0

Write

Command

Reg Addr (D15-D13)

R/W (D12)

Broadcast (D11)

D10-D8

001

111

010

111

100

111

110

111

Data Frame

Control Frame

Time Slot

AIC20 #1

AIC20 #2

AIC20 #1

AIC20 #2

Data Frame

Host Port Interface

TLV320AIC20, TLV320AIC21

TLV320AIC24, TLV320AIC25

TLV320AIC20K, TLV320AIC24K

SLAS363D – MARCH 2002 – REVISED APRIL 2005

Figure 29. Control Frame Data Format

NOTE: In this example, the broadcast operation (D11 = 1) is used to program the four control registers of Reg.1,

Reg.2, Reg.4, and Reg.6 in all four DSP codecs of two TLV320AIC2xs in cascade (Master, Slave2, Slave1, and

Slave0) during the same frame (i.e., register 1 of the four codecs contains the same data).

The host port uses a 2-wire serial interface (SCL, SDA) to program channel six of each of the codec control

registers, and selectable protocol between S

2C mode and I2C mode. The S2C is a write-only mode, and the I2C

is a read-write mode selected by bits D1-D0 (HPC bits) of control register 2. If the host interface is not needed,

the two pins of SCL and SDA can be programmed to become general-purpose I/Os. If selected to be used as I/O

pins, the SDA and SCL pins become output and input pins respectively, determined by D1 and D0.

Both S

2C and I2C require a SMARTDM device address to communicate with the AIC2x. One of SMARTDM's

advanced features is the automatic cascade detection (ACD) that enables SMARTDM to automatically detect the

total number of codecs in the serial connection and use this information to assign each codec a distinct

SMARTDM device address. Table 2 lists device addresses assigned to each codec in the cascade by the

SMARTDM. The master always has the highest position in the cascade. For example in Figure 20, there is a

total of 4 codecs in the cascade (i.e., one master and 3 slaves), then the device addresses in row 4 are used in

which the master is codec 1 with a device address of 0000.

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