1476 Chapter 39
Bit 0 1 2 3 4 5 6 7
State 0 0 0 0 0 0 0 0 Maximum negative tuning of VCXO.
0 0 0 0 0 0 0 1 Center frequency of VCXO.
1 1 1 1 1 1 1 1 Maximum positive tuning of VCXO.
Extended Instruction Commands
Note that not all possible commands are defined.
Extended Instruction Address Byte
Bits 0–2 Direct Command Enable Bits.
Bit 0 1 2
State 0 0 0 Identifies this command uses the
Extended Command set.
1 0 0 Direct Command 1. See Direct Com-
mands above.
0 1 0 Direct Command 2. See Direct Com-
mands above.
0 0 1 Direct Command 3. See Direct Com-
mands above.
All other possible states of bits 0–2 are reserved and are
not to be used unless defined by the AES in the future.
Bits 3–7 Extended address bits.
Bit 3 4 5 6 7
State 0 0 0 0 0 Command 0, default.
1 0 0 0 0 Command 4.
0 1 0 0 0 Command 5.
1 1 0 0 0 Command 6.
0 0 1 0 0 Command 7.
x x x x x Commands follow in sequence.
1 1 1 1 1 Command 34.
Extended Command 4 data Byte
Bits 0–1 Light Control.
Bit 0 1
State 0 0 No light, default.
1 0 Light 1.
0 1 Light 2.
1 1 Both lights.
Bits 2–3 Test Signal.
Bit 2 3
State 0 0 No test signal, default.
1 0 Test signal 1 (under consideration).
0 1 Test signal 2 (under consideration).
1 1 Test signal 3 (under consideration).
Bit 4 ADC Calibration.
0 No calibration, default.
1 Calibrate ADC
Bit 5 Reset
0 No reset, default.
1 Reset.Table 39-2. Direct Commands (Continued)Bits 6–7 Microphone Status Data Page Request.
Bit 6 7
State 0 0 Page 0, default.
1 0 Page 1.
0 1 Page 2.
1 1 Page 3.
Extended Command 5 Data Byte
Bits 0–3 Dither and noise shaping.
Bit 0 1 2 3
State 0 0 0 0 No dither or noise shaping, default.
x x x x All other states are under consideration.
Bits 4–7 Sampling frequencies.
Bit 4 5 6 7
State 0 0 0 0 48 kHz, default.
1 0 0 0 44.1 kHz.
0 1 0 0 96 kHz multiple = 2.
1 1 0 0 88.2 kHz multiple = 2.
0 0 1 0 192 kHz multiple = 4.
1 0 1 0 176.4 kHz multiple = 4.
x x x x All other states reserved.
Extended Command 6 Data Byte
Bits 0–6 XY balance, (Notes 1, 2).
Bit 0 1 2 3 4 5 6
State 0 0 0 0 0 0 0 Left 0.5, Right 0.5, Center, default.
1 1 1 1 1 1 0 Left 1.0, Right 0.0, Left (A) channel only.
1 0 0 0 0 0 1 Left 0.0, Right 1.0, Right (B) channel only.
0 0 0 0 0 0 1 Same as for 1 0 0 0 0 0 1.
Bits
0–v6MS width (Notes 1, 2).Bit 0 1 2 3 4 5 6
State 0 0 0 0 0 0 0 Mid 0.5, Side 0.5, Stereo, default.
1 1 1 1 1 1 0 Mid 1.0, Side 0.0, Mono.
1 0 0 0 0 0 1 Mid 0.0, Side 1.0, Difference only.
0 0 0 0 0 0 1 Same as for 1 0 0 0 0 0 1.
Bit 7 XY or MS Select (Note 2).
0 XY stereo, default.
1 MS stereo.
Note 1. Signed two’s complement notation is used to encode the
channel weights. Bit 6 is the sign extension = –2^0 , bit 5 = 2–1
Bit 0 = 2–6.
Note 2. If XY is selected, then AES3 Channel 1 carries the Left
audio channel, AES3 Channel 2 carries the Right audio channel,
and bits 0–6 control the XY balance. If MS is selected, then AES3
Channel 1 carries the Mid or sum signal, AES3 Channel 2 carries
the Side or difference signal, and bits 0–6 control the MS width.
Extended Command 7 Data Byte
Bits 0–7 Equalization Curve Select.
Bit 0 1 2 3 4 5 6 7Table 39-2. Direct Commands (Continued)