DSD1796 datasheet(21/53 Pages) TI

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DSD1796

SLES101 – DECEMBER 2003

www.ti.com

MODE CONTROL REGISTERS

User-Programmable Mode Controls

The DSD1796 includes a number of user-programmable functions which are accessed via mode control registers. The

registers are programmed using the serial control interface, which is previously desribed in the SERIAL CONTROL

INTERFACE section of this data sheet. Table 2 lists the available mode control functions, along with their default reset

conditions and associated register index.

Table 2. User-Programmable Function Controls

FUNCTION

DEFAULT

BIT

PCM

DSD

BYPASS

Digital attenuation control

0 dB to –120 dB and mute, 0.5 dB step

0 dB

ATL[7:0] (for L-ch)

ATR[7:0] (for R-ch)

yes

Attenuation load control—Disabled, enabled

Attenuation disabled

ATLD

yes

Input audio data format selection

16-, 20-, 24-bit standard (right-justified) format

24-bit MSB-first left-justified format

16-/24-bit I2S format

24-bit I2S format

FMT[2:0]

yes

Sampling rate selection for de-emphasis

Disabled,44.1 kHz, 48 kHz, 32 kHz

De-emphasis disabled

DMF[1:0]

yes

yes(1)

De-emphasis control—Disabled, enabled

De-emphasis disabled

DME

yes

Soft mute control—Mute disabled, enabled

Mute disabled

MUTE

yes

Output phase reversal—Normal, reverse

Normal

REV

yes

Attenuation speed selection

×1 fS, ×(1/2)fS, ×(1/4)fS, ×(1/8)fS

×1 fS

ATS[1:0]

yes

DAC operation control—Enabled, disabled

DAC operation enabled

OPE

yes

Zero flag pin operation control

DSD data input, zero flag output

DSD data input

ZOE

yes

Stereo DF bypass mode select

Monaural, stereo

Monaural

DFMS

yes

Digital filter rolloff selection

Sharp rolloff, slow rolloff

Sharp rolloff

FLT

yes

Infinite zero mute control

Disabled, enabled

Disabled

INZD

yes

System reset control

Reset operation , normal operation

Normal operation

SRST

yes

DSD interface mode control

DSD enabled, disabled

Disabled

DSD

yes

Digital-filter bypass control

DF enabled, DF bypass

DF enabled

DFTH

yes

Monaural mode selection

Stereo, monaural

Stereo

MONO

yes

Channel selection for monaural mode data

L-channel, R-channel

L-channel

CHSL

yes

Delta-sigma oversampling rate selection

×64 fS, ×128 fS, ×32 fS

×64 fS

OS[1:0]

yes

yes(2)

yes

PCM zero output enable

Enabled

PCMZ

yes

DSD zero output enable

Disabled

DZ[1:0]

yes

FUNCTION AVAILABLE ONLY FOR READ

Zero detection flag

Not zero, zero detected

Not zero = 0

Zero detected = 1

ZFGL (for L-ch)

ZFGR (for R-ch)

yes

Device ID (at TDMCA)

–

ID[4:0]

yes

(1) When in DSD mode, DMF[1:0] is defined as DSD filter (analog FIR) performance selection.

(2) When in DSD mode, OS[1:0] is defined as DSD filter (analog FIR) operation rate selection.

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