STAC9750 datasheet(35/73 Pages) IDT

35 / 73 page

STAC9750/9751

VALUE-LINE TWO-CHANNEL AC’97 CODECS

PC AUDIO

IDT™

STAC9750/9751

V 5.8 103106

VALUE-LINE TWO-CHANNEL AC’97 CODECS

6.5.1.

Reset (00h)

Default: 6990h

Writing any value to this register performs a register reset, which causes all registers to revert to

their default values. Reading this register returns the ID code of the part.

6.5.2.

Play Master Volume Registers (Index 02h, 04h, and 06h)

These registers manage the output signal volumes. Register 02h controls the stereo LINE_OUT

master volume (both right and left channels), register 04h controls the Headphone Out master vol-

ume, and register 06h controls the MONO volume output. Each step corresponds to 1.5 dB. The

MSB of the register is the mute bit. When this bit is set to 1 the level for that channel is set at -

∞ dB.

ML5 through ML0 is for left channel level, MR5 through MR0 is for the right channel and MM5

through MM0 is for the mono out channel. When bits D5 and D13 are set in any of these registers it

automatically writes all 1 to the next lower 5-bits.

The default value is 8000h for registers 02h, 04h, and 06h, which corresponds to 0 dB attenuation

with mute on.

6.5.2.1.

Master Volume (02h)

Default: 8000h

Note: If optional bits D13 & D5 of register 02h are set to 1, then the corresponding attenuation is set to

46.5dB and the register reads will produce 1Fh as a value for this attenuation/gain block.

6.5.2.2.

Headphone Out Volume (04h)

Default: 8000h

D15

D14

D13

D12

D11

D10

RSRVD4

SE4

SE3

SE2

SE1

SE0

ID9

ID8

ID7

ID6

ID5

ID4

ID3

ID2

ID1

ID0

Table 16. Play Master Volume Register

Mute

Mx5…Mx0

Function

Range

00 0000

0dB Attenuation

Req.

01 1111

46.5 Attenuation

Req.

xx xxxx

∞ dB Attenuation

Req.

D15

D14

D13

D12

D11

D10

Mute

RSRVD

ML5

ML4

ML3

ML2

ML1

ML0

Reserved

MR5

MR4

MR3

MR2

MR1

MR0

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