CS4294SLASHCS4298 datasheet(47/81 Pages) CIRRUS

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CS4205

DS489PP4

5.29

Special Feature Address Register (Index 6Ch)

A[3:0]

Special Feature Address. This register functions as an index register to select the desired func-

tionality of the Special Feature Data Register (Index 6Eh). Before using any of these indexed

registers, the correct index value must be written to bits A[3:0].

Default

0000h

5.30

Special Feature Data Register (Index 6Eh)

D[15:0]

Special Feature Data. This register is an indexed data port for the special feature registers (In-

dex 6E, Address 00h - 0Fh) which control advanced subsystems of the CS4205, such as digital

mixer settings, effects engine parameters, ZV Port control, and internal error condition signaling.

Before using any of these functions, the correct index value must be written to the Special Fea-

ture Address Register (Index 6Ch).

Default

8000h

5.31

Digital Mixer Input Volume Registers (Index 6Eh, Address 00h - 05h)

Mute

Digital Mixer Mute. Setting this bit mutes the respective input signal, both left and right inputs.

GL[5:0]

Left Volume Control. The GL[5:0] bits are used to control the digital mixer left channel input vol-

ume. Each step corresponds to 1 dB gain adjustment. The total range is 0 dB to -63 dB gain.

GR[5:0]

Right Volume Control. The GR[4:0] bits are used to control the digital mixer right channel input

volume. Each step corresponds to 1 dB gain adjustment. The total range is 0 dB to -63 dB gain.

Default

8000h. This value corresponds to 0 dB gain and Mute ‘set’.

If the digital mixer signals an overflow condition by setting the MLOF or MROF bit in the IEC Status Register (Index 6Eh,

Address 0Bh), the controller should correct the error by reducing the digital mixer input volumes in these registers. The

Digital Mixer Input Volume Registers are listed in Table 17.

D15

D14

D13

D12

D11

D10

000000000000

D15

D14

D13

D12

D11

D10

D15

D14

D13

D12

D11

D10

D15

D14

D13

D12

D11

D10

Mute

GL5

GL4

GL3

GL2

GL1

GL0

GR5

GR4

GR3

GR2

GR1

GR0

Function

00h

PCM Input Volume

01h

ADC Input Volume

02h

SDI1 Volume

03h

SDI2 Volume

04h

SDI3 Volume

05h

ZV Volume

Table 17. Digital Mixer Input Volume Register Index

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