6.2. SDI Audio Extract Registers
Bytes Offset | Name |
---|---|
00h | Audio Control Register |
01h | Audio Presence Register |
02h | Audio Status Register |
03h | SD EDP Presence Register |
04h | Error Status Register |
05h | Reserved |
06h | FIFO Status Register |
07h | Clock Status Register |
08h-09h | Reserved |
10h-3Fh | Channel Status RAM (0×00), (0×01), ... (0×2F) |
Bit | Name | Access | Description |
---|---|---|---|
Audio Control Register | |||
0 | Enable | RW | Enables the audio extraction component and internal AES output. |
3:1 | Extract pair | RW | Defines the audio pair that the component extracts. For example:
|
4 | Extract pair MSB | RW | For 3G-SDI Level A standard, this field extends the extract pair field to allow for future implementations with 32 embedded audio channels. For 3G-SDI Level B standard, this field selects the active video half of the 3G multiplex. |
5 | Mute | RW | Drive this register high to mute the audio output. |
7:6 | Unused | — | Reserved for future use. |
Audio Presence Register | |||
3:0 | Data packet present | RO | Reports which audio data groups are detected in the SDI stream. The following bits correspond to the number of audio groups detected:
|
7:4 | Control packet present | RO | Reports which audio control packets are detected in the SDI stream. |
Audio Status Register | |||
3:0 | Active channel | RO | Reflects the lower four bits of the active channel field of the audio control packet. |
4 | Asynchronous | RO | Reflects the asx bit (synchronous mode bit) of the RATE (sampling rate) field of the audio control packet. |
6:5 | Sample rate | RO | Reports the X1 and X0 bits of the sample rate code from the RATE field of the audio control packet. |
7 | Status valid | RO | Set to 1b when the audio control packet is present in the video stream. |
SD EDP Presence Register | |||
3:0 | EDP Present | RO | Reports which audio extended data groups are detected in the SD-SDI stream. |
7:4 | Unused | — | Reserved for future use. |
Error Stat
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