Altera SDI Audio IP Cores - Manual (Page 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
RW Data packet present 3:0
Reports which audio control packets are detected in the
SDI stream. RO Control packet present 7:4
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
RO Active channel 3:0
Reflects the asx bit of the RATE (sampling rate) field of the
audio control packet. RW Asynchronous 4
Reports the X1 and X0 bits of the sample rate code from
the RATE field of the audio control packet. RW Sample rate 6:5
Set to 1b when the audio control packet is present in the
video stream. RW Status valid 7
SDI Audio IP Registers Altera Corporation
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SDI Audio Extract Registers 5-6
2014.06.30