CDB4923 Datasheet, PDF(16/50 Page) Cirrus Logic

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

CDB4923 Datasheet, PDF (16/50 Pages) Cirrus Logic – Evaluation Board

◁

CDB4923 CDB49300

7. INPUT

7.1 Analog Input

A stereo input is provided at RCA jacks J55 and

J56. These inputs are designed to accept a full-scale

signal of 2 Vrms. Each single-ended signal is con-

verted to a differential 2 Vrms signal before being

applied to the inputs of the CS5334 ADC. The

CS5334 and its analog input buffers can be found

in Figure 9.

The CS5334âs clock signals can be accessed at the

test points labeled ALG_MCLK, ALG_SCLK, and

ALG_LRCLK (these test points can be found in

Figure 11). The serial data stream coming from the

CS5334 can be probed at the 34SDATA test point

(TP22). Jumper J52 is used to configure the

CS5334 for slave or master mode. The default,

slave mode, is used when the CS5334 accepts all

clock signals from another source. When in master

mode, the CS5334 accepts MCLK and generates

SCLK and LRCLK. The CDB4923/300 is config-

ured to use the CS5334 in slave mode only. Please

contact the factory for details on how to use the

CS5334 in master mode.

The digital output format of the CS5334 can be

configured with switch S4 as described in Table 14.

More details on the CS5334 can be found in the

CS5334 datasheet.

7.2 Digital Input

There are two possible sources of digital audio for

the CDB4923/300: S/PDIF, and bursty delivery

from the host PC across the parallel interface.

Bursty delivery is accomplished by spooling a file

from the host PC to the CDB4923/300 using the

34DIF1

34DIF0

Digital Input Format

20-Bit Left Justified, Rising SCLK

20-Bit Left Justified, Falling SCLK

20 Bit I2S, Rising SCLK (default)

Power Down

Table 14. CS5334 Digital Output Formats (S4)

PARLLPLY.EXE program found on the included

floppy. Audio delivered across the S/PDIF inter-

face comes from a digital source such as a DVD

player.

The S/PDIF inputs are J30 (RCA) and J32 (Opti-

cal), and can be found in Figure 10. It is vital to

note, though, that only one of these S/PDIF inputs

can be used at any given time. The active jack is de-

termined by the setting of jumper J31 (S/PDIF IN).

When J31 is in the âOPTâposition, S/PDIF data will

be accepted only from J32. When J31 is in the

âRCAâ position, S/PDIF data will be accepted only

from J30.

The S/PDIF signal is routed to the CS8414 receiver

(U13). The digital output format of the CS8414 is

configured using switch S1 as described in Table

15. The CDB4923/300 comes from the factory con-

figured to operate in I2S mode. Note that this de-

fault should not be changed unless the DSP has

been configured to use a different serial format.

Jumpers J65 and J66 control the SEL and

CS12/FCK pins of the CS8414. These pins can be

used to select what is displayed on the channel sta-

tus outputs of the Digital Audio Interface Receiver.

By default these pins are pulled up and the jumpers

are not stuffed. If the user wishes to change the val-

ues of these pins a stake header should be installed.

The CS8414, its control switch, and jumpers can be

found in Figure 10. If more details on the CS8414

are needed, please reference the CS8414 datasheet.

Audio Serial Port Format

LO Out, L/R, 16-24 Bits

HI In, L/R, 16-24 Bits

LO Out, L/R, I2S

HI In, L/R, I2S (default)

LO Out, WSYNC, 16-24 Bits

HI Out, L/R, 16 Bits LSBJ

LO Out, L/R, 18 Bits LSBJ

HI Out, L/R, MSB Last

Table 15. Digital Output Format settings

for CS8414 (S1)

DS262DB2

▷