Tripath Technology, Inc. – Preliminary Technical Information

21

TCD6000 – Rev. 1.0/09.04

Channel Volume

Addr

Register Name

D7

D6

D5

D4

D3

D2

D1

D0

25h

Channel 1 Volume

V17

V16

V15

V14

V13

V12

V11

V10

26h

Channel 2 Volume

V27

V26

V25

V24

V23

V22

V21

V20

27h

Channel 3 Volume

V37

V36

V35

V34

V33

V32

V31

V30

28h

Channel 4 Volume

V47

V46

V45

V44

V43

V42

V41

V40

29h

Channel 5 Volume

V57

V56

V55

V54

V53

V52

V51

V50

2Ah

Channel 6 Volume

V67

V66

V65

V64

V63

V62

V61

V60

Default

0

0

0

0

0

0

0

0

The TCD6000 has 6 channel volume registers, one for each channel. The 8-bit value in each register

represents the volume loudness for the corresponding channel. The least significant bit, D0, represents a

volume increment of 0.5dB. Therefore the total range available is 128dB. Maximum volume is achieved

when the volume register contains a value of FFh, and no sound is heard if its value is 00h.

In addition, a “coarse gain” adjustment (1X, 2X, 4X, and 8X) is made possible by programming the Volume

Change Control Register.

Volume Ramp Rate

Addr

Register Name

D7

D6

D5

D4

D3

D2

D1

D0

2Bh

Volume Ramp Rate

RR7

RR6

RR5

RR4

RR3

RR2

RR1

RR0

Default

1

0

0

0

0

0

0

0

The TCD6000 can be programmed to have volume changes take effect immediately or be ramped at a

predefined rate for all channels. If the Volume Ramp Enable bit is set, the Volume Ramp Rate Register

defines the ramp rate.

Although the Volume Control Registers define the channel volume within an accuracy of ½ dB, volume will

be ramped internally in 1/8 dB steps when ramping is enabled.

The number entered into the Volume Ramp Rate Register can be from 0 (00h) to 255 (FFh). If the number

entered is N, the time delay between two consecutive 1/8 dB volume increments is equal to:

N x (4 periods of LRCK)

As an example, if N = 100 and data samples are coming in at a 44.1kHz rate, the period of LRCK is

22.67usec. The delay between two consecutive 1/8 dB volume increments is:

100 x 4 x 22.67usec = 9068usec

Therefore if the volume change is 60 dB (480 increments of 1/8 dB), the total ramp time will be:

480 x 9068usec = 4.32 second

Channel Mute Control

Addr

Register Name

D7

D6

D5

D4

D3

D2

D1

D0

2Ch

Channel Mute Control

M6

M5

M4

M3

M2

M1

HM

AM

Default

0

0

0

0

0

0

1

0

The TCD6000 has 3 different Mute functions: Soft-Mute, Hard-Mute, and Auto-Mute.