参数资料
型号: IP-SDI
厂商: Altera
文件页数: 109/140页
文件大小: 0K
描述: IP VIDEO INTERFACE - SDI
标准包装: 1
系列: *
类型: MegaCore
功能: 视频系统用串行数字接口
许可证: 初始许可证
Chapter 4: SDI Audio IP Cores
4–21
AES Format
AES Format
The SDI cores use the AES standard. The Audio Engineering Society (AES), together
with the European Broadcasting Union (EBU), created a digital audio transmission
standard known as the AES/EBU standard. The AES standard is a digital audio
standard for transporting digital audio signals serially between devices.
Using the AES format requires the entire 64-bit AES frame to be sent serially. As the
AES defines the preambles as biphase mark codes, which cannot be directly decoded
to 4 bits, you must replace the preambles with X = 0000b , Y = 0001b , and Z = 0010b .
This internal AES format serializes the bit-parallel data words by sending the least
significant bits (LSB) first, with the audio sample (up to 24 bits).
Figure 4–4 shows the timing diagram of the internal AES format.
Figure 4–4. Internal AES Format Timing Diagram
clock
aud_de
aud_ws
aud_data
Z/X Preamble
LSB = 0
Z/X Preamble
1/0
Channel
Status
Parity
Y Preamble
LSB = 1
W ord n - Left Channel
32 bits
Avalon-ST Audio Interface
To allow the standard components inside SOPC Builder to interconnect, you must
define the Avalon-ST audio interface. The Avalon-ST audio interface must carry audio
to and from physical AES3 interfaces; which means to support the AES3 outputs, the
interface must transport the extra V, U, and C bits. You may create the P bit.
Each audio block consists of 192 frames, and each frame has channels 1 and 2. Each
frame has a combination of the bits shown in Figure 4–5 .
Figure 4–5. AES Format
Pream b le 4 b it
AUX data
or
A u dio data 4 b it
AES channel pair 1, s ub -frame 2 (CH2)
A u dio data 20 b it
V
U
C
P
The Avalon-ST is a packet-based interface, which carries audio information as a
sequence of data packets. The functions define the types of packets as audio data
packets and audio control packets.
February 2013
Altera Corporation
Serial Digital Interface (SDI) MegaCore Function
User Guide
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