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Mode Control Registers (PCM1770)

User-Programmable Mode Controls

PCM1770 , PCM1771

SLES011E – SEPTEMBER 2001 – REVISED MARCH 2007

The PCM1770 device has a number of user-programmable functions that can be accessed via mode control

registers. The registers are programmed using the serial control interface, as discussed in the Software Control

(PCM1770) section. Table 6 lists the available mode control functions, along with their reset default conditions

and associated register index.

Table 7 shows the mode control register map. Each register includes an index (or address) indicated by the

IDX[6:0] bits.

Table 6. User-Programmable Mode Controls

FUNCTION RESET DEFAULT REGISTER NO. BIT(S)

Soft mute control, L/R independently Disabled 01 MUTL, MUTR

Digital attenuation level setting, 0 dB to –63 dB in 1-dB steps, L/R 0 dB 01, 02 ATL[5:0], ATR[5:0]

independently

Oversampling rate control (128 f

, 192 f

, 256 f

, 384 f

) 128 f

oversampling 03 OVER

Polarity control for analog output for R-channel DAC Not inverted 03 RINV

Analog mixing control for analog in, AIN (terminal 14) Disabled 03 AMIX

44.1-kHz de-emphasis control Disabled 03 DEM

Audio data format select 24-bit, left-justified format 03 FMT[2:0]

Zero cross attenuation Disabled 04 ZCAT

Power-down control Disabled 04 PWRD

Table 7. Mode Control Register Map

REGIS IDX [6:0] B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

TER (B14-B8)

01 01h 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 MUTR MUTL ATL5 ATL4 ATL3 ATL2 ATL1 ATL0

02 02h 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV ATR5 ATR4 ATR3 ATR2 ATR1 ATR0

(1) (1)

03 03h 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 OVER RSV RINV AMIX DEM FMT2 FMT1 FMT0

(1)

04 04h 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV RSV ZCAT RSV RSV RSV PWR

(1) (1) (1) (1) (1) (1)

(1) RSV is reserved for test operation. It must be set to 0 during regular operation.

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