Cirrus-logic CS4244 Bedienungsanleitung PDF herunterladen (Seite 32)

DS900F1 32

CS4244

In Left Justified or I²S mode, the CS4244 transmits the AIN1 and AIN2 signals on the SDOUT1 pin and

the AIN3 and AIN4 signals on the SDOUT2 pin.

4.6.1.2 DAC1-4 Signal Routing

In TDM mode, the “DAC1-4 SOURCE[2:0]” bits in the "SP Data Sel." register advise the CS4244 where

data for the DAC1-4 path is located within the incoming TDM streams. Details for this register and the bit

settings can be found in Figures 21 and 22.

In Left Justified or I²S mode, the CS4244 routes the data on the SDIN1 pin to DAC1 and DAC2 and the

data on the SDIN2 pin to DAC3 and DAC4.

Device D

SDIN2

SDOUT1

SDIN1

Device A

SDIN2

SDOUT1

SDIN1

Device B

SDIN2

SDOUT1

SDIN1

Device C

SDIN2

SDOUT1

SDIN1

DSP

ADC data from Device A is loaded into the

first 4 slots of the 16 slot TDM Stream

going out of SDOUT1 pin of Device A. The

last 12 slots are all coded as “0's”.

The ADC data of Device B is coded into the

first four slots of the output TDM stream,

followed by the first 12 slots of the TDM

stream coming in on SDIN2, placing the

ADC data from Device A into slots 5-8 of the

outgoing TDM stream.

The ADC data of Device C is coded into the

first four slots of the output TDM stream,

followed by the first 12 slots of the TDM

stream coming in on SDIN2, placing the

ADC data from Device B into slots 5-8 and

the ADC data from Device A into slots 9-12

of the outgoing TDM stream.

The ADC data of Device D is coded into the

first four slots of the output TDM stream,

followed by the first 12 slots of the TDM

stream coming in on SDIN2, placing the

ADC data from Device C into slots 5-8, the

ADC data from Device B into slots 9-12, and

the ADC data from Device A into slots 13-16

of the outgoing TDM stream.

Device D

SDIN2

SDOUT1

SDIN1

Device A

SDIN2

SDOUT1

SDIN1

Device B

SDIN2

SDOUT1

SDIN1

Device C

SDIN2

SDOUT1

SDIN1

DSP

Each of the device’s ADC data

is reflected in the TDM stream

on SDOUT1 and then routed to

the system controller.

Note:

This diagram shows the configuration for 16 slot TDM streams. If 8 slot TDM streams are used, two separate serial data lines will need to be

connected from the DSP. One would carry the serial data for Devices C&D and the other would carry the serial data for Devices A&B

Figure 20. Conventional SDOUT (Left) vs. Sidechain SDOUT (Right) Configuration

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