Altera Serial Digital Interface (SDI) MegaCore Function - Manual (Page 98)

4–10 Chapter 4: SDI Audio IP Cores
SDI Audio Extract MegaCore Function
Serial Digital Interface (SDI) MegaCore Function February 2013 Altera Corporation
User Guide
SDI Audio Extract MegaCore Function
The SDI Audio Extract MegaCore function accepts the SD-, HD-, and 3G-SDI from the
SDI MegaCore and extracts one channel pair of embedded audio.
The format of the embedded audio is in accordance with the SMPTE272M-A standard
for the SD-SDI video standard, or in accordance with the SMPTE299M standard for
HD-SDI and provisionally for 3G-SDI video standard. If you are extracting more than
one channel pair, you must use multiple instances of the component. This MegaCore
function supports AES audio format for 48-kHz sampling rate.
Functional Description
Figure 4–2 shows a block diagram of the SDI Audio Extract MegaCore function.
The SDI Audio Extract MegaCore function consists of the audio extraction core and a
register interface block that provides support for an Avalon-MM control bus.
The clock recovery block recreates a 64 × sample rate clock, which you can use to clock
the audio output logic. As the component recreates this clock from a 200-MHz
reference clock, the created clock may have a higher jitter than is desirable.
Figure 4–2. SDI Audio Extract MegaCore Function Block Diagram
Sample FIFO
Clock Recovery
Audio Extract or Audio Extract with Avalon
Avalon-MM
48 KHz Clock
Core
Error Detection
Packet Find
and
Extract
AES
to
Avalon-ST Audio
(Audio Extract
with Avalon Only)
Channel
Status RAM
Register Interface
aud_clk
internal AES
Avalon-ST
Audio
vid_clk
SD/HD/3G-SDI