CM6533DH datasheet(30/60 Pages) CMEDIA

30 / 60 page

CM6533,CM6533N,CM6533X1,CM6533DH

USB Audio Chip

Page 30 / 60

www.cmedia.com.tw

Rev.1.6

6.6 SPDIF Control Description

6.6.1 SPDIF Frame Description

 Audio format: linear 16 bit default.

 Allowed sampling frequencies (Fs) of the audio:



44.1kHz from CD



48 kHz from DAT



32 kHz from DSR

 One-way communication: from a transmitter to a receiver.

 Control information:



V (validity) bit: indicates if audio sample is valid



U (user) bit: user free coding i.e. running time song, track number



C (channel status) bit: emphasis, sampling rate and copy permit



P (parity) bit: error detection bit to check for good reception

 Coding format: biphase mark except the headers (preambles), for sync purposes

 Bandwidth occupation: 100kHz up to 6Mhz (no DC)

 Signal bitrate is 2.8Mhz (Fs=44.1kHz), 2Mhz (Fs=32kHz) and 3.1Mhz (Fs=48kHz)

1 0 1 1 0 0 1 0 1 0 1 1 0 1 0 0 1 1 0 1 0

Clock

Data Signal

Biphase Mark

Signal

Figure -17 Biphase Mark signal of SPDIF

Preamble

cell-order

(last cell "0")

(last cell "1")

------------------------------------------------------

"B"

11101000

00010111

"M"

11100010

00011101

"W"

11100100

00011011

Preamble “B”:

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