GRASS VALLEY 8920MUX -, Instruction Manual, Page: 19 / 50

8920MUX Instruction Manual 19
Configuration
AES Input Channel Status Bits
AES input channel status bits are handled differently in each of the three
sync modes. The synchronous AES mode (syn.AES) passes the channel
status bits from the AES inputs. The asynchronous AES (asyn.AES) and
synchronous Matrix mode (syn.matrix) modify the input status bits to
prevent random bits from occurring. Refer to
Table 4 for a detailed over-
view of what the channel status bits are set to for each mode.
Table 4. AES Channel Status Bits For Each Mode
Byte Bit Description Sync Mode Sync Matrix Mode Async Mode
Byte 0
0 Professional/Consumer Pass Professional=1 Professional=1
1 Audio/Non-audio Pass Audio=0 Audio=0
2
Emphasis Pass
No emphasis
100
No emphasis
100
3
4
5 Fs locked/unlocked Pass Locked=0 Locked=0
6
Sampling Rate Pass
48 kHz
01
48 kHz
01
7
Byte 1
0
Channel Mode Pass
Not indicated
0000
Not indicated
0000
1
2
3
4
User Bit Mode Pass
No user information
indicated 0000
No user information
indicated 0000
5
6
7
Byte 2
0
Aux Sample Bits
Pass (may be wrong if the
Mux setting of 20/24 bits
does not match input)
Follows web page:
20 bit=000
24 bit=001
Follows web page:
20 bit=000
24 bit=001 1
2
3
Audio Sample Length
Pass (may be wrong if the
Mux setting does not
match input)
Not indicated=000 Not indicated=000 4
5
6
Reserved=00 Pass 00 00
7
Bytes 3-22 Various Pass All zeros All zeros
Byte 23 0-7 CRC
CRC made correct by Mux
IC if incorrect
20 bit=71h
24 bit=1Eh 20 bit=71h
24 bit=1Eh
V Validity Bit Pass Pass Pass
U User Data Bit Pass Pass Pass
C Channel Status Bit See above See above See above
P Parity Bit Pass Set by firmware Set by firmware