CM6533-N Datasheet, PDF (30/60 Pages) C-Media Electronics – USB 2.0 Full-Speed compliant

CM6533,CM6533N,CM6533X1,CM6533DH
USB Audio Chip
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)
Clock
Data Signal
10011010010
Biphase Mark
Signal
1011001010110100110100
Figure -17 Biphase Mark signal of SPDIF
Preamble “B”:
Page 30 / 60
Rev.1.6
Preamble cell-order
cell-order
(last cell "0") (last cell "1")
------------------------------------------------------
"B"
11101000
00010111
"M"
11100010
00011101
"W"
11100100
00011011
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