AudioControl Avalon Betriebsanweisung PDF herunterladen (Seite 37)

Audio Presence Register

When you specify the Channel Status RAM parameter to

2, this field selects the channel pair for the RAM written to

by registers 10h to 3Fh. If you specify the Channel Status

RAM parameter to 0 or 1, ignore this signal.

Reports which audio data groups are detected in the SDI

stream.

The following bits correspond to the number of audio

groups detected:

• Bit [0] = Audio group 1

• Bit [1] = Audio group 2

• Bit [2] = Audio group 3

• Bit [3] = Audio group 4

RWData packet present3:0

Reports which audio control packets are detected in the

SDI stream.

ROControl packet present7:4

Audio Status Register

Reports the detected video input standard.

• Bits[7:5] = Picture structure code. Defined values for

picture structure code are:

• 001b = 486 or 576 line SD-SDI

• 100b = 720 line HD-SDI

• 101b = 1080 line HD-SDI

• 010b = 1080 line 3G-SDI

• Bit[4] = 0b—Interlace or segmented frame,

1b—Progressive.

• Bits[3:0] = Frame rate code. Defined values for frame

rate code (in Hz) are:

• 0010b = 23.97

• 0011b = 24

• 0101b = 25

• 0110b = 29.97

• 0111b = 30

• 1001b = 50

• 1010b = 59.94

• 1011b = 60

ROActive channel3:0

Reflects the asx bit of the RATE (sampling rate) field of the

audio control packet.

RWAsynchronous4

Reports the X1 and X0 bits of the sample rate code from

the RATE field of the audio control packet.

RWSample rate6:5

Set to 1b when the audio control packet is present in the

video stream.

RWStatus valid7

SDI Audio IP Registers

Altera Corporation

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UG-SDI-AUD

SDI Audio Extract Registers

5-6

2014.06.30

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