Altera DisplayPort MegaCore Function - Manual (Page 32)

Figure 4-8: Typical Secondary Stream Packet
0
0
0
HB2
0
0
0
HB3
0
0
0
HB1
0
0
0
DB15
DB10
DB9
DB8
DB7
DB14
DB13
DB12
DB11
DB6
DB5
DB4
DB3
DB2
DB1
HB0 DB0
DB31
DB26
DB25
DB24
DB23
DB30
DB29
DB28
DB27
DB22
DB21
DB20
DB19
DB18
DB17
DB16
Data[127:0]
End of Packet
Start of Packet
Valid
Audio Interface
The audio encoder is upstream of the secondary stream encoder. It generates the Audio InfoFrame,
Timestamp, and Audio sample packets from the incoming audio sample data stream. Then, it sends the
three packet types to the secondary stream encoder before they are transmitted to the downstream sink
device.
The audio port is parameterized for the number of audio channels required in the design. You can use 2
or 8 channels. Each channel’s audio data is sent to the
txN_audio_lpcm_data
port.
The IP core requires a
txN_audio_valid
signal for designs in which the
txN_audio_clk
signal is higher
than the actual sample clock. The
txN_audio_valid
signal qualifies the audio data on the
txN_audio_lpcm_data
input.
4-16 Audio Interface
UG-01131
2015.05.04
Altera Corporation DisplayPort Source
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