CM6502B Datasheet, PDF (30/40 Pages) C-Media Electronics – USB Audio Sound Chip

CM6502 / CM6502B
USB Audio Sound Chip
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:
M ChannelA W ChannelA B ChannelA W ChannelA M ChannelA W ChannelA
Frame 191
SubFrame SubFrame
Frame 0
Frame 1
Figure -2 Preamble Description of 192 SPDIF frame
7.6.2 SPDIF Out Channel Status
bit0
bit1
bit2
bit3
bit4
bit5
bit6
bit7
consumer audio/
byte0
copyright
/professional non-audio
pre-emphasis
mode
default
byte1
default
byte2
default
byte3
default
0(P)
0(P)
0(fixed)
0(P)
0(P)
1(P)
0(P)
0(fixed) 0(fixed) 0(fixed) 0(fixed)
category code
L
0(P)
0(P)
0(P)
0(P)
0(P)
0(P)
0(P)
source number
channel number
0(fixed) 0(fixed) 0(fixed) 0(fixed) 0(fixed) 0(fixed) 0(fixed)
sampling frequency
clock accuracy
reserved
0(P)
0(P)
0(P)
0(fixed) 0(fixed) 0(fixed) 0(fixed)
NOTE
P : these bit can be programmed by USB HID or USB vendor command
7.7 Digital Mic
Digital-Mic Clock and Data Timing
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