CM6533DH datasheet(31/60 Pages) CMEDIA

31 / 60 page

CM6533,CM6533N,CM6533X1,CM6533DH

USB Audio Chip

Page 31 / 60

www.cmedia.com.tw

Rev.1.6

Marks a word containing data for channel A (left) at the start of the data-block.

Preamble “M”:

Marks a word with data for channel A that is not at the start of the data-block.

Preamble “W”:

Marks a word containing data for channel B (right, for stereo). When using more than 2 channels, this could also be

any other channel (except for A).

The number of subframes that are used depends on the number of channels that is transmitted. A CD-player uses

Channels A and B (left/right) and so each frame contains two subframes. A block contains 192 frames and starts with

a preamble "B":

Preamble

Aux Data

LSB

Audio Data

MSB

V U C P

27 28 29 30 31

Sub-frame

V: Valid, U:User-Data, C:Channel-Status-Data, P:Parity-Bit

Figure -1 SPDIF Subframe Description

In each block, 384 bits of channel status and subcode info are transmitted. The Channel-status bits are equal for both

subframes, so actually only 192 useful bits are transmitted:

ChannelA

Frame 191

Frame 0

Frame 1

SubFrame

Figure -2 Preamble Description of 192 SPDIF frame

6.6.2 SPDIF Out Channel Status

bit0

bit1

bit2

bit3

bit4

bit5

bit6

bit7

byte0

consumer

/professional

audio/

non-audio

pre-emphasis

mode

default

0(P)

1(P)

0(P)

0(fixed)

byte1

category code

default

0(P)

byte2

source number

channel number

default

0(fixed)

byte3

sampling frequency

clock accuracy

reserved

default

0(P)

0(fixed)

**Note: (P) These bits can be programmed by USB HID or USB vendor command

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