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CHANNEL (SOURCE)
USB_TO_DEVICE_DIFFERENCE
I2S_TO_DEVICE_AVERAGE
I2S_TO_DEVICE_DIFFERENCE
PIPELINE_OUT_0
PIPELINE_OUT_1
USB_TO_DEVICE_0
USB_TO_DEVICE_1
I2S_TO_DEVICE_0
I2S_TO_DEVICE_1
MIC_IN_0
MIC_IN_1
PACKED_PIPELINE_OUTPUT
PACKED_MIC
PACKED_REF
PACKED_ALL
NOTE: The MIC_IN_0 and MIC_IN_1 signals are at 16kHz. If they are routed to a 48kHz output they
will be sample repeated three times. No antialiasing filter is applied.
The following section illustrates how to use the IO mapping and scaling commands.
Using the SET_IO_MAP command, the user can choose the sources that get routed to the following 3
destinations -
}
the USB output from device to host
}
the I2S output from device
}
the reference going into the device
For instance, to route I2S channel 0 (= 9 as shown in the Source table) input to the device to USB
channel 1 output from device ( = 1 as shown in the destination table), the command is:
vfctrl_usb SET_IO_MAP 1 9
where the first argument "1" refers to USB_FROM_DEVICE_1 as shown in the destination table and the
second argument "9" refers to I2S_TO_DEVICE_0 in the source table.
XM-014232-PC
VALUE DEFINITION
Half of the difference between ch0 and ch1 of USB input from host to
2
device.
3
Average of I2S input to device.
4
Half of the difference between ch0 and ch1 of I2S input to device.
5
Pipeline output channel 0
6
Pipeline output channel 1
7
USB input channel 0 from host to device
8
USB input channel 1 from host to device
9
I2S input channel 0 to device
10
I2S input channel 1 to device
11
Ch0 Microphone input seen by the pipeline
12
Ch1 Microphone input seen by the pipeline
pack 16kHz pipeline output on some 48kHz output (See Appendix J:
13
Capturing packed samples for further information)
pack 16kHz mic input to pipeline on some 48kHz output
14
(See Appendix J: Capturing packed samples for further information)
pack 16kHz reference input to pipeline on some 48kHz output
15
(See Appendix J: Capturing packed samples for further information)
pack 1 channel of 16kHz mic, reference input and pipeline.
When this option is used, the other channel of the same output also
16
gets PACKED_ALL set in its IO map.
(See Appendix J: Capturing packed samples for further information)
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