AudioControl Avalon Betriebsanweisung PDF herunterladen (Seite 18)

audio data size is configurable at compile time and matches the audio data sample size. Including the aux,

the audio data word would be 24 bits.

In Avalon-ST audio, the data is packed as 24 bit symbols, typically with 1 symbol per beat [23:0]. The core

transmits the audio control data as a packet after the audio data to meet the latency requirements.

The packet type identifier defines the packet type. The packet type identifier is the first value of any packet,

when the start of packet signal is high. The audio data packet identifier is 0×A and the audio control data

packet identifier is 0×E.

The table below lists the packet types.

Table 3-5: Avalon-ST Packet Types

DescriptionType Identifier

Video data packet0

User packet types1–8

Audio data packet10

Audio control data packet14

Video control data packet15

Reserved9–15

The preamble data, XYZ from AES, describes whether the data is at the start of a block and which channel

the audio refers to. In Avalon-ST audio protocol, you are not required to transport the preamble data because

the information stored in the data is described by the start of packet, end of packet, and channel signals.

The start of packet, end of packet, and channel signals indicate the start of the audio sample data and the

associated audio channel.

For a single audio channel, the channel signal indicates channel 1 for all valid samples. This figure shows an

example of a single audio channel.

Figure 3-7: Single Audio Channel

sop

Audio data

header identifier

Single channel audio data

(Channel = 1)

Audio data control packet

header identifier (LSB 4 bits)

eop

data [23:0]

channel

A D0

D190 D191

V0 V1 V2 V3 V4 V5 V6 V7

1 1

Audio sample data

Audio control data

For multiple channels, the Avalon-ST interface standard allows the packets to interleave across the channels.

By interleaving, the interface allows multiple audio sources to be multiplexed and demultiplexed.

Altera Corporation

SDI Audio IP Functional Description

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Avalon-ST Audio Interface

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2014.06.30

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